3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a= array( 'mela' => 'pera', 'pippo'=> 'pera', 'carlo'=>'banana', 'saverio'=>'pera', 'antonio'=>'banana', ); $b= array_diff_key( $a , array_unique( $a ) ); $i=0; print_r($b); print_r($b[1]);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [pippo] => pera [saverio] => pera [antonio] => banana ) Warning: Undefined array key 1 in /in/Cf5sL on line 19

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