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<?php $array = array( 0 => array('user_id' => '1', 'email'=>'email1'), 1 => array('user_id' => '2', 'email'=>'email2'), 2 => array('user_id' => '3', 'email'=>'email3') ); var_dump(array_flip($array));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/kMAc2 on line 8 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/kMAc2 on line 8 Warning: array_flip(): Can only flip string and integer values, entry skipped in /in/kMAc2 on line 8 array(0) { }

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