2019-02-27

array_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));// output
Array
([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))// output
Array
([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));// output
Array
([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);// output
Array
([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);// output
Array
([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));// output
12

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