3v4l.org

run code in 300+ PHP versions simultaneously
<?php function filter($q){ return $q;} $ololo = 'wat?'; $filter = 'ololo'; $k = "filter()"; echo $$k; echo "\n"; echo $$$k;
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $filter() in /in/KGLIn on line 8 Warning: Undefined variable $filter() in /in/KGLIn on line 10 Warning: Undefined variable $ in /in/KGLIn on line 10

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