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<?php $arr = array( '', false, null, 0, 0.4, -.1, "\0" ); $arr = array_flip($arr); $arr = array_keys($arr); print_r($arr);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/8qEgr on line 13 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/8qEgr on line 13 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/8qEgr on line 13 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/8qEgr on line 13 Array ( [0] => [1] => 0 [2] => )

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