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run code in 300+ PHP versions simultaneously
<?php $j = 0; for($i = 0; $i < 1000; $i++){ echo $++j; }
Output for 5.4.0 - 5.4.28, 5.5.0 - 5.5.12
Parse error: syntax error, unexpected '++' (T_INC), expecting variable (T_VARIABLE) or '$' in /in/JPJCt on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected T_INC, expecting T_VARIABLE or '$' in /in/JPJCt on line 5
Process exited with code 255.

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