3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(&$a) {} function &g($a) { $v = $a; return $v; } $a = function() {}; f(intval(true));
Output for 8.3.0 - 8.3.4
Fatal error: Uncaught Error: f(): Argument #1 ($a) could not be passed by reference in /in/CSlSH:8 Stack trace: #0 {main} thrown in /in/CSlSH on line 8
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17
Fatal error: Uncaught Error: f(): Argument #1 ($a) cannot be passed by reference in /in/CSlSH:8 Stack trace: #0 {main} thrown in /in/CSlSH on line 8
Process exited with code 255.
Output for 7.4.9 - 7.4.33
Fatal error: Uncaught Error: Cannot pass parameter 1 by reference in /in/CSlSH:8 Stack trace: #0 {main} thrown in /in/CSlSH on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.8
Output for 7.0.0 - 7.0.20
Notice: Only variables should be passed by reference in /in/CSlSH on line 8
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.21
Strict Standards: Only variables should be passed by reference in /in/CSlSH on line 8
Output for 5.2.3 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/CSlSH on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<br /> <b>Parse error</b>: syntax error, unexpected T_FUNCTION in <b>/in/CSlSH</b> on line <b>6</b><br />
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, 5.0.0 - 5.0.5
<br /> <b>Parse error</b>: parse error, unexpected T_FUNCTION in <b>/in/CSlSH</b> on line <b>6</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error in <b>/in/CSlSH</b> on line <b>6</b><br />
Process exited with code 255.

preferences:
240.55 ms | 401 KiB | 341 Q