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    Type Hinting

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    User Contributed Notes 23 notes

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    73
    Daniel dot L dot Wood at Gmail dot Com
    12 years ago
    People often ask about scalar/basic typehints.  Here is a drop in class that I use in my MVC framework that will enable typehints through the use of a custom error handler.

    Note: You should include this code above all other code in your include headers and if you are the using set_error_handler() function you should be aware that this uses it as well.  You may need to chain your set_error_handlers()

    Why?
    1) Because people are sick of using the is_* functions to validate parameters.
    2) Reduction of redundant coding for defensive coders.
    3) Functions/Methods are self defining/documenting as to required input.

    Also..
    Follow the discussion for typehints in PHP 6.0 on the PHP Internals boards.

    <?php

    define    ('TYPEHINT_PCRE'              ,'/^Argument (\d)+ passed to (?:(\w+)::)?(\w+)\(\) must be an instance of (\w+), (\w+) given/');

    class     Typehint
    {

        private static     $Typehints = array(
                'boolean'   => 'is_bool',
                'integer'   => 'is_int',
                'float'     => 'is_float',
                'string'    => 'is_string',
                'resrouce'  => 'is_resource'
            );

        private function     __Constrct() {}

        public static function     initializeHandler()
        {

                set_error_handler('Typehint::handleTypehint');

            return     TRUE;
        }

        private static function     getTypehintedArgument($ThBackTrace, $ThFunction, $ThArgIndex, &$ThArgValue)
        {

            foreach (    $ThBackTrace as $ThTrace)
            {

                    // Match the function; Note we could do more defensive error checking.
                    if (isset($ThTrace['function']) && $ThTrace['function'] == $ThFunction)
                {

                        $ThArgValue = $ThTrace['args'][$ThArgIndex - 1];

                    return     TRUE;
                }
            }

            return     FALSE;
        }

        public static function     handleTypehint($ErrLevel, $ErrMessage)
        {

            if (    $ErrLevel == E_RECOVERABLE_ERROR)
            {

                if (    preg_match(TYPEHINT_PCRE, $ErrMessage, $ErrMatches))
                {

                    list(    $ErrMatch, $ThArgIndex, $ThClass, $ThFunction, $ThHint, $ThType) = $ErrMatches;

                    if (isset(    self::$Typehints[$ThHint]))
                    {

                            $ThBacktrace = debug_backtrace();
                            $ThArgValue  = NULL;

                        if (    self::getTypehintedArgument($ThBacktrace, $ThFunction, $ThArgIndex, $ThArgValue))
                        {

                            if (    call_user_func(self::$Typehints[$ThHint], $ThArgValue))
                            {

                                return     TRUE;
                            }
                        }
                    }
                }
            }

            return     FALSE;
        }
    }

    Typehint::initializeHandler();

    ?>

    An are some examples of the class in use:

    <?php

    function teststring(string $string) { echo $string; }
    function     testinteger(integer $integer) { echo $integer; }
    function     testfloat(float $float) { echo $float; }

    // This will work for class methods as well.

    ?>

    You get the picture..
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    28
    michaelrfairhurst at gmail dot com
    7 years ago
    The scalar type hinting solutions are all overthinking it. I provided the optimized regex version, as well as the fastest implementation I've come up with, which just uses strpos. Then I benchmark both against the TypeHint class.

    <?php
    function optimized_strpos($ErrLevel, $ErrMessage) {
            if (    $ErrLevel == E_RECOVERABLE_ERROR
                    // order this according to what your app uses most
                    return strpos($ErrMessage, 'must be an instance of string, string')
                    ||     strpos($ErrMessage, 'must be an instance of integer, integer')
                    ||     strpos($ErrMessage, 'must be an instance of float, double')
                    ||     strpos($ErrMessage, 'must be an instance of boolean, boolean')
                    ||     strpos($ErrMessage, 'must be an instance of resource, resource');
    }

    function     optimized_regex($ErrLevel, $ErrMessage) {
            if (    $ErrLevel == E_RECOVERABLE_ERROR) {
                if(    preg_match('/^Argument \d+ passed to (?:\w+::)?\w+\(\) must be an instance of (\w+), (\w+) given/', $ErrMessage, $matches))
                    return     $matches[1] == ($matches[2] == 'double' ? 'float' : $matches[2]);
            }
    }
    ?>

    BENCHMARKING Typehint::handleTypehint()
    string type hint.....[function it(string $var) {}]............2.1588530540466 seconds
    float type hint......[function it(float $var) {}].............2.1563150882721 seconds
    integer type hint....[function it(integer $var) {}]...........2.1579530239105 seconds
    boolean type hint....[function it(boolean $var) {}]...........2.1590459346771 seconds

    BENCHMARKING optimized_regex()
    string type hint.....[function it(string $var) {}]............0.88872504234314 seconds
    float type hint......[function it(float $var) {}].............0.88528990745544 seconds
    integer type hint....[function it(integer $var) {}]...........0.89038777351379 seconds
    boolean type hint....[function it(boolean $var) {}]...........0.89061188697815 seconds

    BENCHMARKING optimized_strpos()
    string type hint.....[function it(string $var) {}]............0.52635812759399 seconds
    float type hint......[function it(float $var) {}].............0.74228310585022 seconds
    integer type hint....[function it(integer $var) {}]...........0.63721108436584 seconds
    boolean type hint....[function it(boolean $var) {}]...........0.8429491519928 seconds
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    8
    kalkamar at web dot de
    12 years ago
    I really like the Daniel`s Typehinting-Class, but you please not that it may be relevant for the performance if you use Typehinting for scalar values very often.

    Here is my performance-test:

    <?php

    function notypehinting($x)
    {
            is_string($x);   //checking the type manually instead
    }

    function     typehinting(string $x)
    {
    }

    $test=new timer;
    for(    $i=0;$i<10000;$i++)
    {
    try{
            notypehinting('test');
    }
    catch(    Exception $e){}
    }
    echo     $test.'<br>';

    $test2=new timer;
    for(    $i=0;$i<10000;$i++)
    {
    try{
            typehinting('test');
    }
    catch(    Exception $e){}
    }
    echo     $test2.'<br>';
    ?>

    Output:

    0.0088460445404053
    0.21634602546692

    Result:
    typehinting() ist more than 20 times slower than notypehinting()

    You see: typehinting for scalar types (like suggested by Daniel) is not the best thing for the performance if you use it very often.
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    5
    MiChAeLoKGB
    3 years ago
    Please note, that with PHP 7, type hinting is faster than normal implementation.
    This has to do with type hinting before PHP 7 allowing only objects and arrays and anything else (scalars) would throw an error.

    I did some using code "doom at doom dot pl" posted 2 years ago

    Here are results from couple of test runs using PHP 7 (200.000 loops)
    - teststringNormal took: 0.01799488067627
    - teststringOverhead took: 0.012195825576782

    - teststringNormal took: 0.027030944824219
    - teststringOverhead took: 0.012197017669678

    - teststringNormal took: 0.017856121063232
    - teststringOverhead took: 0.012274980545044

    As you can see, the overhead is faster and much more consistent.

    Here is one run with the is_string check removed from Normal:
    - teststringNormal took: 0.010342836380005
    - teststringOverhead took: 0.012849092483521
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    11
    bantam at banime dot com
    11 years ago
    Daniel's typehint implementation was just what I was looking for but performance in production wasn't going to cut it. Calling a backtrace every time hurts performance. For my implementation I didn't use it, after all, PHP tells us what the data type is in the error message, I don't feel I need to evaluate the argument where I am using typehinting. Here is the cut down version I use in my error handling class:

    <?php
                public static function typehint($level, $message)
            {
                if(    $level == E_RECOVERABLE_ERROR)
                {
                    if(    preg_match('/^Argument (\d)+ passed to (?:(\w+)::)?(\w+)\(\) must be an instance of (\w+), (\w+) given/', $message, $match))
                    {
                        if(    $match[4] == $match[5])
                            return     true;
                    }
                }
               
                return     false;
            }
    ?>

    Hope this can be of use to somebody.
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    4
    jesdisciple @t gmail -dot- com
    12 years ago
    The manual's sample code says:
    <?php
    //...
    // Fatal Error: Argument 1 must not be null
    $myclass->test(null);
    //...
    ?>

    And this is true, unless a default value of NULL is given; in fact, this is the only way to give a default value for object arguments (as a default value must be a constant expression):
    <?php
    $mine     = new MyClass();
    $mine->test(NULL);
    class     MyClass{
        public function     __construct(OtherClass $arg = NULL){
            if(    is_null($arg)){
                    //Apply default value here.
                }
        }
        public function     test(array $arr = NULL){
                print_r($arr);
        }
    }
    class     OtherClass{
       
    }
    ?>
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    3
    doom at doom dot pl
    6 years ago
    I've done some tests of the overhead that class Typehint  gives us.
    At my PC it goes as follows:
    teststringNormal took: 0.041965961456299
    teststringOverhead took: 0.48374915122986
    It's like 10x longer time (not mention about memory usage), it's just because exception is thrown EVERY SINGLE TIME, along with expensive preg_match() and debug_backtrace() calls.
    I think that using class in bigger applications will increase overhead like 100% or more.
    <?php

    function teststringOverhead(string $string) {
        return     $string;
    }
    function     teststringNormal($string){
        if(!    is_string($string)){
            return;
        }
        return     $string;
    }
    $loopTimes = 20000;

    /////////// test of overhead implementation vs normal
    $t1 = microtime(true);
    for(    $i = 0; $i <= $loopTimes; $i++)  teststringNormal("xxx");
    echo     "<br>teststringNormal took: " . (microtime(true) - $t1);

    $t2 = microtime(true);
    for(    $i = 0; $i <= $loopTimes; $i++)  teststringOverhead("xxx");
    echo     "<br>teststringOverhead took: " . (microtime(true) - $t2);
    ?>
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    3
    sorin dot badea91 at gmail dot com
    7 years ago
    I've implemented a basic function to ensure argument's type.

    <?php
    /**
    * Primary types
    */
    class Type
    {
        const     SKIP     = 0;
        const     INT      = 1;
        const     STRING   = 2;
        const     BOOLEAN  = 3;
        const     CALLBACK = 4;
        const     FLOAT    = 5;
        const     RESOURCE = 6;
    }

    /**
    * @throws InvalidArgumentException
    */
    function ensureType()
    {
            $debugStack = debug_backtrace();
            $argv       = $debugStack[1]['args'];
            $types      = func_get_args();
        foreach (    $argv as $key => $value) {
                $message = null;
            if (    is_null($value)) {
                continue;
            }
            switch (    $types[$key]) {
                case     Type::INT:
                    if (!    is_int($value)) {
                            $message = 'Argument ' . $key . ' passed to ' . $debugStack[1]['function'] . '() must be of type int';
                    }
                    break;
                case     Type::STRING:
                    if (!    is_string($value)) {
                            $message = 'Argument ' . $key . ' passed to ' . $debugStack[1]['function'] . '() must be of type string';
                    }
                    break;
                case     Type::BOOLEAN:
                    if (!    is_bool($value)) {
                            $message = 'Argument ' . $key . ' passed to ' . $debugStack[1]['function'] . '() must be of type boolean';
                    }
                    break;
                case     Type::CALLBACK:
                    if (!    is_callable($value)) {
                            $message = 'Argument ' . $key . ' passed to ' . $debugStack[1]['function'] . '() must be a valid callback';
                    }
                    break;
                case     Type::FLOAT:
                    if (!    is_float($value)) {
                            $message = 'Argument ' . $key . ' passed to ' . $debugStack[1]['function'] . '() must be of type float';
                    }
                    break;
                case     Type::RESOURCE:
                    if (!    is_resource($value)) {
                            $message = 'Argument ' . $key . ' passed to ' . $debugStack[1]['function'] . '() must be of type resource';
                    }
                    break;
            }
            if (!    is_null($message)) {
                if (    is_object($value)) {
                        $message .= ', instance of ' . get_class($value) . ' given';
                } else {
                        $message .= ', ' . gettype($value) . ' given';
                }
                throw new     InvalidArgumentException($message);
            }
        }
    }

    function     dummyFunction($var1, $var2, $var3)
    {
            ensureType(Type::BOOLEAN, Type::INT, Type::STRING);
    }

    $object = new ReflectionClass('ReflectionClass');

    dummyFunction(1, $object, 'Hello there');
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    1
    wickedmuso at gmail dot com
    11 years ago
    One useful thing with Type Hinting that I could not find in the documentation (but tested) is that you can also use an Interface in the hint (versus a Class).  This is a very useful tool if you are trying to code to Interfaces rather than Classes (which is common in Test Driven Development and Dependency Injection paradigms).  It means your external class can present itself into the method as long as it implements the nominated Interface (obviously).
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    1
    wbcarts at juno dot com
    12 years ago
    TYPE-HINTING and VISIBILITY

    Type-hinting is just one more small piece of PHP that protects our objects when visibility cannot.

    <?php

    class Point {
      public     $x, $y;

      public function     __construct($xVal = 0, $yVal = 0) {
            $this->x = $xVal;
            $this->y = $yVal;
      }
    }

    class     Polyline {
      protected     $points = array();

      public function     addPoint(Point $p) {  // the line we're interested in...
            $this->points[] = $p;
      }
    }

    $point1 = new Point(15, 12);
    $polyline = new Polyline();
    $polyline->addPoint($point1);
    $polyline->addPoint(new Point(55, 22));
    $polyline->addPoint(new Point(33, 31));

    $polyline->addPoint(new stdClass());    // PHP will throw an error for us! 

    ?>

    Since our Polyline::addPoint() function has to be public, any outside code can try to pass anything. But, when type-hinting is declared, PHP throws an error when phoney data tries to sneak by.
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    0
    ASchmidt at Anamera dot net
    1 year ago
    Sometimes you want to work with classes (not their instances), but Typehinting is only permitted for an object (instance).

    Here is sample code that tests whether the parameter is a valid type (the class/subclass/instance of an expected class):

    <?php
    declare(strict_types=1);

    class     MyClass {};

    function     myfunc( $class ) {
            // Validate classname.
            if ( $class instanceof MyClass ) {
                $class = get_class( $class );
        } elseif ( !    class_exists( $class ) or !is_a( $class, MyClass::class, true ) ) {
            throw new \    TypeError( "$class is not of type " . MyClass::class );  
        }
            // Proceed with processing of MyClass subclass ...
    }

    $myclass = new MyClass;
    myfunc( $myclass );                // valid
    myfunc( MyClass::class );        // valid
    myfunc( \String::class );          // not of type MyClass.
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    0
    mrice at rcs dot us
    4 years ago
    In regards to http://php.net/manual/en/language.oop5.typehinting.php#103729 , when using PHP in Eclipse, the best way to typehint is already available in Eclipse natively.

    The format is /* @var $variable ObjectName */

    The single /* is important. You can also use namespaces, IE

    /* @var $variable \Some\Namespace */

    In short, there is no reason to create functions that return itself.
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    -1
    Anonymous
    5 years ago
    i think this is pretty close.

    $lines=hhb_mustbe('array',file("foofile"));
    //either file succeeds, and returns an array, or file returns FALSE which is not an array, which throws an unexpectedValueException.

    $socket=hhb_mustbe('Socket',socket_create(AF_INET,SOCK_STREAM,getprotobyname('tcp')));
    //either socket_create succeeds, and returns a Socket, or socket_create returns False, which is not a resource of type Socket, and you get an UnexpectedValueException

    $size=hhb_mustbe('int',filesize(somefile));
    //either filesize() returns an integer, or returns FALSE wich is not an int, and you'll get UnexpectedValueException.

        function hhb_mustbe(/*string*/$type,/*mixed*/$variable){
            //should it be UnexpectedValueException or InvalidArgumentException?
            //going with UnexpectedValueException for now...
            $actual_type=gettype($variable);
            if($actual_type==='unknown type'){
                //i dont know how this can happen, but it is documented as a possible return value of gettype...
                throw new Exception('could not determine the type of the variable!');
            }
            if($actual_type==='object'){
                if(!is_a($variable,$type)){
                    $dbg=get_class($variable);
                    throw new UnexpectedValueException('variable is an object which does NOT implement class: '.$type.'. it is of class: '.$dbg);
                }
                return $variable;
            }
            if($actual_type==='resource'){
                $dbg=get_resource_type($variable);
                if($dbg!==$type){
                    throw new UnexpectedValueException('variable is a resource, which is NOT of type: '.$type.'. it is of type: '.$dbg);
                }
                return $variable;
            }
            //now a few special cases
            if($type==='bool'){
                $parsed_type='boolean';   
                } else if($type==='int'){
                $parsed_type='integer';
                } else if($type==='float'){
                $parsed_type='double';
                } else if($type==='null'){
                $parsed_type='NULL';
                } else{
                $parsed_type=$type;
            }
            if($parsed_type!==$actual_type && $type!==$actual_type){
                throw new UnexpectedValueException('variable is NOT of type: '.$type.'. it is of type: '.$actual_type);
            }
            //ok, variable passed all tests.
            return $variable;
        }
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    0
    gdecad at NOSPAM dot example dot com
    9 years ago
    I have made a little bench between three method of type hinting for native type (string, integer, ...).

    First method : by test type in function like :
    <?php
    function testTest($arg) {
        if (!    is_string($arg)) {
                trigger_error('Argument $arg passed to test must be an instance of string, other given');
        }
        return     $arg;
    }
    ?>

    Second method : by object representing native type :
    <?php
    function testObject(StringObj $arg) {
        return     $arg;
    }
    ?>

    Third method : by class TypeHint proposed by Daniel :
    <?php
    function testHint(string $arg) {
        return     $arg;
    }
    ?>

    the results are here :
    bench for 100000 iterations,  in seconds
            avg                    min                    max                    total
    test    5.3275489807129E-6    2.8610229492188E-6    0.0033020973205566    0.53275895118713
    object    4.9089097976685E-6    3.814697265625E-6    0.0025870800018311    0.49089503288269
    hint    3.2338891029358E-5    2.9802322387695E-5    0.0025920867919922    3.2338931560516

    As you can see, the method by object is the best
    now you know...
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    0
    dpariyskiy at netatwork dot com
    11 years ago
    Daniel, thank you for the type hinting class. Very useful.
    For anyone having a problem where php isn't setting Daniel's error handler, as was the case for me, try changing initializeHandler function to the following:

    <?php
    public static function initializeHandler()
    {
       
            set_error_handler(array('Typehint','handleTypehint'));
       
        return     TRUE;
    }
    ?>

    Hope this helps,
    --Dmitriy
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    0
    DanielLWood [at] Gmail [dot] Com
    12 years ago
    To follow up on my original post dealing with the type hinting class I provided:

    Kalkamar is absolutely correct, it is slow and is a hack.  Everyone who uses it and wants to see this type of syntax native needs to post on the 'php internals' development thread in support.

    Thanks,

    Dan
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    0
    marcus at ignorethis netweblogic dot com
    12 years ago
    Love the typehint object Daniel. Great effort!

    However, it still throws catchable fatal errors, which is not what I want, so I added one line to handleTypehint() so it throws an Exception.

    <?php
    public static function handleTypehint($ErrLevel, $ErrMessage) {
            if (    $ErrLevel == E_RECOVERABLE_ERROR) {
                if (    preg_match ( TYPEHINT_PCRE, $ErrMessage, $ErrMatches )) {
                    list (     $ErrMatch, $ThArgIndex, $ThClass, $ThFunction, $ThHint, $ThType ) = $ErrMatches;
                    if (isset (     self::$Typehints [$ThHint] )) {
                            $ThBacktrace = debug_backtrace ();
                            $ThArgValue = NULL;
                        if (    self::getTypehintedArgument ( $ThBacktrace, $ThFunction, $ThArgIndex, $ThArgValue )) {
                            if (    call_user_func ( self::$Typehints [$ThHint], $ThArgValue )) {
                                return     TRUE;
                            }
                        }
                    }
                    throw new     Exception($ErrMessage);
                }
            }
            return     FALSE;
        }
    ?>
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    mlovett at morpace dot com
    15 years ago
    Type hinting works with interfaces too. In other words, you can specify the name of an interface for a function parameter, and the object passed in must implement that interface, or else type hinting throws an exception.
    up
    -1
    john at cast dot com
    9 years ago
    i use eclipse ganymede as an IDE and it offers "intellisense" where it can, i.e. when variables are "declared" via type hinting or a "new"-statement . i found using the following pattern helps eclipse along as well:

    <?php
    class MyClass{

      public static function     Cast(MyClass &$object=NULL){
           return     $object;
      }

      public     method CallMe(){
      }
    }

    $x=unserialize($someContent);
    $x=MyObject::Cast($x);
    $x->CallMe();
    ?>

    after calling Cast(), due to the type hinting, eclipse offers me the "CallMe" function in a dropdown when i type "$x->" in the code afterwards.

    i found this very practical und included the Cast() function in my code template for new classes. i've been wondering, if there is a drawback i oversaw, but i haven't noticed any negative effects so far... maybe some of you will find this just as handy as i do ;o)

    p.s. do note: when used in inherited classes a STRICT-notice comes up, because the function definition of the inherited class doesn't match the parent's definition (different type hinting) - but it works great!
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    -1
    dr dot mustafa dot darwish at gmail dot com
    2 years ago
    This matrix demonstrate passing different variable types with different type hints:
    <?php

    $array     = [10, 10.12, true, '10USD', 'USD'];
    function     getValue($x, $y)
    {
            $typeMap = [
                'integer' => 'int',
                'int' => 'int',
                'float' => 'float',
                'double' => 'float',
                'real' => 'float',
                'string' => 'string',
                'boolean' => 'bool',
                'bool' => 'bool',
        ];
            $yType = $typeMap[gettype($y)];
            $xType = $typeMap[gettype($x)];

        if (    $xType == 'string')
                $x = "'$x'";
        elseif (    $xType == 'bool')
                $x = $x ? 'true' : 'false';
        try {
            eval(    "if (!function_exists('test$yType')) {function test$yType($yType \$arg){}} test$yType($x);");
        } catch (    Error $e) {
            return     get_class($e).': '.$e->getMessage();
        }
        return     'Pass';
    }

    ?>
    <table border="1" width="50%">
        <thead>

        <tr>
            <td></td>
            <td align="center" colspan="<?= count($array) ?>"><strong>Input value</strong></td>
        </tr>
        <tr>
            <td></td>
            <?php foreach ($array as $header): ?>
                <td><?= gettype($header), ' ', var_export($header) ?></td>
            <?php endforeach; ?>
        </tr>
        </thead>
        <tbody>
        <tr></tr>
        <?php foreach ($array as $y): ?>
            <tr>
                <td><?= gettype($y), ' ', var_export($y) ?></td>
                <?php foreach ($array as $x): ?>
                    <td><?= getValue($x, $y); ?></td>
                <?php endforeach; ?>
            </tr>
        <?php endforeach; ?>
        </tbody>
    </table>
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    -1
    info at thewebsiteguy dot com dot au
    12 years ago
    I find it rather frustrating that PHP has internal data types but doesn't allow optional hinting for it.  I REALLY needed it for something, so I found a way around it.

    <?php
    abstract class DataType
    {
        protected     $length;
        protected     $precision;
        protected     $number;
       
      public function     __construct()
      {
            $this->number = false;
            $this->precision = null;
      }
       
        public function     GetLength()
        {
            return     $this->length;
        }
       
        public function     IsNumber()
        {
            return     $this->number;
        }

        public function     GetPrecision()
        {
            return     $this->precision;
        }
    }

    class     Integer extends DataType
    {
        public function     __construct($length = 12)
        {
                parent::__construct();
                $this->number = true;
                $this->length = $length;
                $this->precision = 0;
        }
    }

    class     Float extends DataType
    {
      public function     __construct($length = 12, $precision = 2)
      {
            parent::__construct();
            $this->number = true;
            $this->length = $length;
            $this->precision = $precision;
      }
    }

    class     String extends DataType
    {
        public function     __construct($length = 255)
        {
                parent::__constructor();
                $this->length = $length;
        }
    }
    //etc etc through the types...
    ?>

    then later I can do this...

    <?php
    final class Field
    {
        public     $Name;
        public     $Mandatory;
        public     $Hidden;
        public     $ListField;
        public     $Value;
        public     $ForeignClass;
        public     $ReadOnly;
        public     $DataType;
       
        public function     __construct($name, DataType $dataType, $mandatory = false, $listField = true, $value = null, $readOnly = false, BaseCBO $foreignClass = null)
        {
                $this->Name = $name;
                $this->DataType = $dataType;
                $this->Mandatory = $mandatory;
                $this->ListField = $listField;
                $this->Value = $value;
                $this->ReadOnly = $readOnly;
                $this->ForeignClass = $foreignClass;
        }
    }

    // ....

    class DoSomeStuff
    {
        public function     DoGenericThings(Field $field)
        {
            if (    $field->DataType instanceof Integer)
            {
                    // do things for an integer field...
                }
        }
    }
    ?>
    up
    -2
    dr dot mustafa dot darwish at gmail dot com
    2 years ago
    the following code demonstrate php7 response to various combination of inputs and type hinting in a simple matrix:
    <?php
    $array     = [10, 10.12, true, '10USD', 'USD'];
    function     getValue($x, $y)
    {
            $typeMap = [
                'integer' => 'int',
                'int' => 'int',
                'float' => 'float',
                'double' => 'float',
                'real' => 'float',
                'string' => 'string',
                'boolean' => 'bool',
                'bool' => 'bool',
        ];
            $yType = $typeMap[gettype($y)];
            $call = 'test($x)';
        if (    $yType == 'string')
                $call = 'test(\'$x\')';
            $template = <<<TEMPLATE_FUNCTION
      if (!function_exists('test')) {function test($yType \$arg){}}
    try{
    $call;
    } catch (Error \$e) {
        return \$e->getMessage();
    }
    return 'Pass';
    TEMPLATE_FUNCTION;
        return eval(    $template);
    }

    ?>
    <table border="1" width="50%">
        <thead>

        <tr><td></td><td align="center" colspan="<?= count($array) ?>"><strong>Input value</strong></td></tr>
        <tr>
            <td></td>
            <?php foreach ($array as $header): ?>
                <td><?= gettype($header), ' ', var_export($header) ?></td>
            <?php endforeach; ?>
        </tr>
        </thead>
        <tbody>
        <tr></tr>
        <?php foreach ($array as $y): ?>
            <tr>
                <td><?= gettype($y), ' ', var_export($y) ?></td>
                <?php foreach ($array as $x): ?>
                    <td><?= getValue($x, $y); ?></td>
                <?php endforeach; ?>
            </tr>
        <?php endforeach; ?>
        </tbody>
    </table>
    up
    -5
    alejosimon at gmail dot com
    9 years ago
    For PHP 5.3 version and namespaces support.

    <?php

    function phpErrorHandler( $code, $message, $file, $line ) {

        if (     error_reporting() & $code ) {

            if (     $code == E_RECOVERABLE_ERROR ) { // Scalar Type-Hinting patch.

                    $regexp = '/^Argument (\d)+ passed to (.+) must be an instance of (?<hint>.+), (?<given>.+) given/i' ;

                if (     preg_match( $regexp, $message, $match ) ) {

                        $given = $match[ 'given' ] ;
                        $hint  = end( explode( '\\', $match[ 'hint' ] ) ) ; // namespaces support.

                        if ( $hint == $given ) return true ;
                }
            }

            return     false ;
        }
    }

    set_error_handler( 'phpErrorHandler' ) ;

    /************************************/

    function typeHintTest( integer $arg1 ) {

            print_r( $arg1 ) ;
    }

    typeHintTest( true ) ; // Error throw because not integer type.

    ?>
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