2019-02-27array_keys()array_keys ( array $array [, mixed $search_value = null [, bool $strict = false ]] ) : array说明：获取数组中部分的或者所有的键名$arr = [ ’name’ => ‘ZhangSan’, ‘age’ => 18, ‘gender’ => ‘man’,];print_r(array_keys($arr));// outputArray( [0] => name [1] => age [2] => gender)array_map()array_map ( callable $callback , array $array1 [, array $… ] ) : array说明：为数组的每个元素应用回调函数$arr = [1, 2, 6];print_r(array_map(function($value){ return $value + 1;}, $arr))// outputArray( [0] => 2 [1] => 3 [2] => 7)array_merge()array_merge ( array $array1 [, array $… ] ) : array说明：合并一个或者多个数组$arr = [1, 2, 6];$arr2 = [2, 6, 7];print_r(array_merge($arr, $arr2));// outputArray( [0] => 1 [1] => 2 [2] => 6 [3] => 2 [4] => 6 [5] => 7)array_multisort()array_multisort ( array &$array1 [, mixed $array1_sort_order = SORT_ASC [, mixed $array1_sort_flags = SORT_REGULAR [, mixed $… ]]] ) : bool说明：对多个数组或者多维数组进行排序（具体可查看官网）$data[] = array(‘volume’ => 67, ’edition’ => 2);$data[] = array(‘volume’ => 86, ’edition’ => 1);$data[] = array(‘volume’ => 85, ’edition’ => 6);$data[] = array(‘volume’ => 98, ’edition’ => 2);$data[] = array(‘volume’ => 86, ’edition’ => 6);$data[] = array(‘volume’ => 67, ’edition’ => 7);foreach ($data as $key => $value) { $volume[$key] = $value[‘volume’]; $edition[$key] = $value[’edition’];}array_multisort($volume, SORT_DESC, $edition, SORT_ASC, $data);print_r($data);// outputArray( [0] => Array ( [volume] => 98 [edition] => 2 ) [1] => Array ( [volume] => 86 [edition] => 1 ) [2] => Array ( [volume] => 86 [edition] => 6 ) [3] => Array ( [volume] => 85 [edition] => 6 ) [4] => Array ( [volume] => 67 [edition] => 2 ) [5] => Array ( [volume] => 67 [edition] => 7 ))array_pop()array_pop ( array &$array ) : mixed说明：弹出数组中最后一个单元$arr = [1, 2, 6];array_pop($arr);print_r($arr);// outputArray( [0] => 1 [1] => 2)array_product()array_product ( array $array ) : number说明：计算数组中所有值的乘积$arr = [1, 2, 6];print_r(array_product($arr));// output12之前因为一些事，就没有每天都更，以后会坚持保持每天都更