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<?php $a = (object) array(); $b = (object) array(); function object_handle($obj) { static $mask = 0, $offset; if (!$mask) { if (defined('HHVM_VERSION')) { $offset = 24; } else { $offset = 8; } $o = (object) array(); $mask = hexdec(substr(spl_object_hash($o), $offset, 8)); // check if we are nested in an output buffering handler to prevent a fatal error with ob_start() below foreach (debug_backtrace(PHP_VERSION_ID >= 50400 ? DEBUG_BACKTRACE_IGNORE_ARGS : false) as $frame) { if (isset($frame['function'][0]) && !isset($frame['class']) && 'o' === $frame['function'][0] && in_array($frame['function'], array('ob_clean', 'ob_end_clean', 'ob_flush', 'ob_end_flush', 'ob_get_contents', 'ob_get_flush')) ) { $frame['line'] = 0; break; } } if (!empty($frame['line'])) { ob_start(); debug_zval_dump($o); $mask ^= substr(ob_get_clean(), 17); } } return hexdec(substr(spl_object_hash($obj), $offset, 8)) ^ $mask; } //ob_start('abc'); //ob_end_flush(); $o = array(); echo object_handle($o[]=(object) array()), "\n"; echo object_handle($o[]=(object) array()), "\n"; echo object_handle($o[]=(object) array()), "\n"; echo object_handle($o[]=(object) array()), "\n"; echo object_handle($o[]=(object) array()), "\n"; echo object_handle($o[]=(object) array()), "\n"; echo object_handle($o[]=(object) array()), "\n"; echo object_handle($b), "\n"; echo object_handle($a), "\n"; function abc() { global $a; isset($a) or $a = (object) array(); return object_handle($a); } ob_start('abc');