3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"black","g"=>"purple"); $a3=array("a"=>"red","b"=>"black","h"=>"yellow"); $result=array_diff($a1,$a2,$a3); print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [b] => green [c] => blue )

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