3v4l.org

run code in 300+ PHP versions simultaneously
<?php $username = ‘robstark@winterfell.com';
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.27
Parse error: syntax error, unexpected '@' in /in/Xq2Z1 on line 2
Process exited with code 255.

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