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<?php $a=array(2,3,null,0,""); print_r(array_keys($a,null)); echo "\n"; $b=array(2,3,"",0,null); echo array_search(null, $b);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 2 [1] => 3 [2] => 4 ) 2

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