Online PHP editor | refs for IDT6m

<?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>";