3v4l.org

run code in 300+ PHP versions simultaneously
<?php a = array('1', '2', '3'); echo a;
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.28
Parse error: syntax error, unexpected '=' in /in/E9chH on line 2
Process exited with code 255.

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