3v4l.org

run code in 300+ PHP versions simultaneously
<?php function &f() {    $x = "foo";    var_dump($x);    print "$x\n";    return($a);}for ($i = 0; $i < 3; $i++) {    $h = &f();}?>
Output for 5.4.0 - 5.4.31
Parse error: syntax error, unexpected ' ' (T_STRING) in /in/2gfDo on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/2gfDo on line 2
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
Parse error: parse error, unexpected T_STRING in /in/2gfDo on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/2gfDo on line 2
Process exited with code 255.
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232.71 ms | 1395 KiB | 122 Q