3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace Foo { namespace Bar { } }
Output for 5.3.0 - 5.3.27, 5.4.0 - 5.4.21
Fatal error: Namespace declarations cannot be nested in /in/WQmlj on line 3
Process exited with code 255.
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178.24 ms | 1395 KiB | 57 Q