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run code in 300+ PHP versions simultaneously
<?php $fname = 'graci.txt'; $fp = fopen('graci.txt', file_exists($fname)? 'a+', 'w+');
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.28
Parse error: syntax error, unexpected ',' in /in/JnA1Y on line 3
Process exited with code 255.

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181.11 ms | 1395 KiB | 65 Q