Online PHP editor | output for IDT6m

@ 2013-06-12T12:53:39Z

<?php
class ClosureHash
{
    /**
     * List of hashes
     *
     * @var SplObjectStorage
     */
    protected static $hashes = null;

    /**
     * Returns a hash for closure
     *
     * @param callable $closure
     *
     * @return string
     */
    public static function from(Closure $closure)
    {
        if (!self::$hashes) {
            self::$hashes = new SplObjectStorage();
        }

        if (!isset(self::$hashes[$closure])) {
            $ref  = new ReflectionFunction($closure);
            $file = new SplFileObject($ref->getFileName());
            $file->seek($ref->getStartLine()-1);
            $content = '';
            while ($file->key() < $ref->getEndLine()) {
                $content .= $file->current();
                $file->next();
            }
            self::$hashes[$closure] = md5(json_encode(array(
                $content,
                $ref->getStaticVariables()
            )));
        }
        return self::$hashes[$closure];
    }
}

class Test {

    public function hello($greeting)
    {
        $closure = function ($message) use ($greeting, &$closure) {
            echo "Inside: ", ClosureHash::from($closure), PHP_EOL, "<br>" ;
        };
        return $closure;
    }
}

$obj = new Test();

$closure = $obj->hello('Hello');
$closure('PHP');
echo "Outside: ", ClosureHash::from($closure), PHP_EOL, "<br>";

$another = $obj->hello('Bonjour');
$another('PHP');
echo "Outside: ", ClosureHash::from($another), PHP_EOL, "<br>";

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Inside: 3f3fbdf1b2226ff3eb08f8e8f6dd1d87 <br>Outside: 3f3fbdf1b2226ff3eb08f8e8f6dd1d87 <br>Inside: 5b5ecac84caac9f40efe587b26de92df <br>Outside: 5b5ecac84caac9f40efe587b26de92df <br>
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION in /in/IDT6m on line 46
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_FUNCTION in /in/IDT6m on line 46
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/IDT6m on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/IDT6m on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/IDT6m on line 9
Process exited with code 255.

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