1 if(!function_exists(‘array_column‘)){ 2     function array_column($input, $columnKey, $indexKey=null){ 3         $columnKeyIsNumber      = (is_numeric($columnKey)) ? true : false; 4         $indexKeyIsNull         = (is_null($indexKey)) ? true : false; 5         $indexKeyIsNumber       = (is_numeric($indexKey)) ? true : false; 6         $result                 = array(); 7         foreach((array)$input as $key=>$row){ 8             if($columnKeyIsNumber){ 9                 $tmp            = array_slice($row, $columnKey, 1);10                 $tmp            = (is_array($tmp) && !empty($tmp)) ? current($tmp) : null;11             }else{12                 $tmp            = isset($row[$columnKey]) ? $row[$columnKey] : null;13             }14             if(!$indexKeyIsNull){15                 if($indexKeyIsNumber){16                     $key        = array_slice($row, $indexKey, 1);17                     $key        = (is_array($key) && !empty($key)) ? current($key) : null;18                     $key        = is_null($key) ? 0 : $key;19                 }else{20                     $key        = isset($row[$indexKey]) ? $row[$indexKey] : 0;21                 }22             }23             $result[$key]       = $tmp;24         }25         return $result;26     }27 }