Created
May 15, 2013 17:32
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A (slightly typo'd and complex) type hinting hack for PHP5
from "Daniel dot L dot Wood at Gmail dot Com"@docs.php.net/language.oop5.typehinting
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| <?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. | |
| ?> |
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