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<?php $sa=array(60 => array(1,5,6)); //print_r($sa); if($sa[40]!== "undefined"){echo implode($sa);}
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key 40 in /in/v2BrJ on line 4 Warning: Array to string conversion in /in/v2BrJ on line 4 Array

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