3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(&$r) { rerutn $r++; } $r = 1; $r = f(f($r)); echo $r;
Output for 5.4.0 - 5.4.17
Parse error: syntax error, unexpected '$r' (T_VARIABLE) in /in/gJcOf on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.26
Parse error: syntax error, unexpected T_VARIABLE in /in/gJcOf on line 5
Process exited with code 255.
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179.45 ms | 1395 KiB | 52 Q