3v4l.org

run code in 300+ PHP versions simultaneously
<?php $foo = null; print isset($foo)?'true', 'false'; $foo = 0; print isset($foo)?'true':'false';
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.19
Parse error: syntax error, unexpected ',' in /in/1iPen on line 3
Process exited with code 255.
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188.91 ms | 1395 KiB | 55 Q