3v4l.org

run code in 300+ PHP versions simultaneously
<?php  ($string) { return strlen($string); } echo  ('a');
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.19
Parse error: syntax error, unexpected '{' in /in/5a0a7 on line 3
Process exited with code 255.

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