【PHP 每日函式】第 03 週期

摘要： 2019-02-27 array_keys() array_keys ( array $array [, mixed $search_value = null [, bool $strict = false ]] ) : array 說明：獲取陣列中部分的或者所有的...

2019-02-27

array_keys()

array_keys ( array $array [, mixed $search_value = null [, bool $strict = false ]] ) : array
說明：獲取陣列中部分的或者所有的鍵名

$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
說明：為陣列的每個元素應用回撥函式

$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
說明：合併一個或者多個數組

$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
說明：對多個數組或者多維陣列進行排序（具體可檢視官網）

$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
說明：彈出陣列中最後一個單元

$arr = [1, 2, 6];
array_pop($arr);
print_r($arr);

// output
Array
(
[0] => 1
[1] => 2
)

array_product()

array_product ( array $array ) : number
說明：計算陣列中所有值的乘積

$arr = [1, 2, 6];
print_r(array_product($arr));

// output
12

之前因為一些事，就沒有每天都更，以後會堅持保持每天都更