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run code in 150+ php & hhvm versions
Bugs & Features
<?php function countRefs($var) { ob_start(); debug_zval_dump(&$var); preg_match('~refcount\((\d+)\)~', ob_get_clean(), $matches); return $matches[1] - 4; } $a = 0; $a = &$a; echo countRefs($a); $a = &$a; echo countRefs($a);
Output for 5.4.0 - 5.4.27
Fatal error: Call-time pass-by-reference has been removed in /in/ihW0g on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Deprecated: Call-time pass-by-reference has been deprecated in /in/ihW0g on line 5 -2-2
Output for 5.2.7 - 5.2.17
Warning: Call-time pass-by-reference has been deprecated in /in/ihW0g on line 5 -2-2
Output for 5.2.5 - 5.2.6
Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of debug_zval_dump(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file in /in/ihW0g on line 5 -2-2
Output for 5.2.1 - 5.2.4
Warning: Call-time pass-by-reference has been deprecated; If you would like to pass it by reference, modify the declaration of debug_zval_dump(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. in /in/ihW0g on line 5 -2-2
Output for 4.3.0 - 5.2.0
Warning: Call-time pass-by-reference has been deprecated - argument passed by value; If you would like to pass it by reference, modify the declaration of debug_zval_dump(). If you would like to enable call-time pass-by-reference, you can set allow_call_time_pass_reference to true in your INI file. However, future versions may not support this any longer. in /in/ihW0g on line 5 -2-2