3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "" echo(isset($a))
Output for 5.4.0 - 5.4.19, 5.5.0 - 5.5.3
Parse error: syntax error, unexpected 'echo' (T_ECHO) in /in/ic3eM on line 5
Process exited with code 255.
Output for 5.3.0 - 5.3.27
Parse error: syntax error, unexpected T_ECHO in /in/ic3eM on line 5
Process exited with code 255.

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