一個很好用的PHP數組篩選多列的方法~____PHP

 function array_columns($input, $column_keys = null, $index_key = null)    {        $result = array();        $keys = isset($column_keys) ? explode(',', $column_keys) : array();        if ($input) {            foreach ($input as $k => $v) {                // 指定返回列                if ($keys) {                    $tmp = array();                    foreach ($keys as $key) {                        $tmp[$key] = $v[$key];                    }                } else {                    $tmp = $v;                }                // 指定索引列                if (isset($index_key)) {                    $result[$v[$index_key]] = $tmp;                } else {                    $result[] = $tmp;                }            }        }        return $result;    }