3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(&x){ $x[] = 'x'; } $t = array(); f($t); var_dump($t);
Output for 5.4.0 - 5.4.5
Parse error: syntax error, unexpected 'x' (T_STRING), expecting variable (T_VARIABLE) in /in/aBXFn on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.15
Parse error: syntax error, unexpected T_STRING, expecting T_VARIABLE in /in/aBXFn on line 3
Process exited with code 255.
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