3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(1=>1, 0=>0); for ($i=0; $i<count($a); $i++) { print $i . " : " $a[$i] . "\n"; } foreach ($a as $i => $v) { print $i . " : " $v . "\n"; }
Output for 5.4.0 - 5.4.26
Parse error: syntax error, unexpected '$a' (T_VARIABLE) in /in/aJKvX on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_VARIABLE in /in/aJKvX on line 4
Process exited with code 255.
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