3v4l.org

run code in 300+ PHP versions simultaneously
<?php $test = 11; $$test = 12; $t e s t = 13; $testy = $$test; var_dump($test, $$test, $testy, $t e s t);
Output for 5.4.0 - 5.4.28
Parse error: syntax error, unexpected 'e' (T_STRING) in /in/UM0Qa on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_STRING in /in/UM0Qa on line 4
Process exited with code 255.
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184.81 ms | 1395 KiB | 65 Q