---
tags: Laravel
---

# PHP常用的陣列相關函式

### ==array_column==
> 取得陣列的特定的值

- array_column(第一個參數為變數，第二個是要指定的key)

$row = [
    ['id' => 1, 'name' => 'bryan'],
    ['id' => 2, 'name' => 'john'],
    ['id' => 3, 'name' => 'lala'],
];

 // 第一個參數為變數，第二個是要指定的key
array_column($row, 'name'); 

print_r(array_column($row, 'id'));

//顯示

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
)

### ==array_keys 獲取陣列 key==
* 印出array key

$row = [
    ['id' => 1, 'name' => 'bryan'],
    ['id' => 2, 'name' => 'john'],
    ['id' => 3, 'name' => 'lala'],
];

// 印出 陣列變數第0個的"key"

print_r(array_keys($row[0]));

//顯示
Array
(
    [0] => id
    [1] => name
)

### ==array_values 獲取出列的值values==

$row = [
    ['id' => 1, 'name' => 'bryan'],
    ['id' => 2, 'name' => 'john'],
    ['id' => 3, 'name' => 'lala'],
];

array_column($row, 'name');

print_r(array_values($row[0]));

//顯示

Array
(
    [0] => 1
    [1] => bryan
)

### ==array_map 從新組新陣列==

* 當我們的陣列有需要從組陣列內容時、就需要用到 array_map ，讓他從新去從組陣列

1. 從組陣列我們先賦予一個新的變數。
2. array_map給予一個function。
3. 給予的參數有點像似 foreach中給予的值 :foreach ($row as $newlist)。
4. 內容將要舊的取代新的陣列從組。
5. return 一個新的陣列出來。

$row = [
    ['id' => 1, 'name' => 'bryan'],
    ['id' => 2, 'name' => 'john'],
    ['id' => 3, 'name' => 'lala'],
];
// 從組陣列我們先賦予一個新的變數
// 類似 foreach ($row as $newlist)
$newarray = array_map(function ($newlist) {
    
    $newlist['id'] = $newlist['id'] * 2;
    return  $newlist;
}, $row);

print_r($newarray);

//顯示
Array
(
    [0] => Array
        (
            [id] => 2
            [name] => bryan
        )

    [1] => Array
        (
            [id] => 4
            [name] => john
        )

    [2] => Array
        (
            [id] => 6
            [name] => lala
        )

)

### ==array_filter 篩選需要的內容==

$row = [
    ['id' => 1, 'name' => 'bryan'],
    ['id' => 2, 'name' => 'john'],
    ['id' => 3, 'name' => 'lala'],
];
$newArray = array_filter($row, function ($newList) {
    // 篩選 符合條件的內容
    return $newList['id'] >= 2;
});

print_r($newArray);

//顯示

Array
(
    [1] => Array
        (
            [id] => 2
            [name] => john
        )

    [2] => Array
        (
            [id] => 3
            [name] => lala
        )

)

### ==array_push 新增陣列值==

$row = [1, 2, 3, 4, 5];

// 第一個為變數、第二個為新增的值
array_push($row, 8);

print_r($row);

//顯示
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 8
)

### ==array_pop 刪除最後一個值==

$row = [1, 2, 3, 4, 5];
array_pop($row);
print_r($row);

### ==合併陣列==

* 將陣列組合 合併

// 合併 陣列
$row = ["name" => "bryan", 'age' => 10, 'username' => 'Mars'];

$row = array_merge($row, ['name' => 'dd', 'id' => 88]);

print_r($row);

### ==sort 重整排序==

$row = [4, 5, 6, 8, 9, 2, 1];

sort($row);

print_r($row);

//顯示

Array
(
    [0] => 1
    [1] => 2
    [2] => 4
    [3] => 5
    [4] => 6
    [5] => 8
    [6] => 9
)

### ==asort 依照value排序==

$row = ["a" => 'bryan', "c" => 'list', "h" => 'mars', "y" => 'allen', "s" => 'danny',];

asort($row);

print_r($row);

//顯示

Array
(
    [y] => allen
    [a] => bryan
    [s] => danny
    [c] => list
    [h] => mars
)

### ==ksort 依照 key排序==

$row = ["a" => 'bryan', "c" => 'list', "h" => 'mars', "y" => 'allen', "s" => 'danny',];

ksort($row);


print_r($row);

//顯示

Array
(
    [a] => bryan
    [c] => list
    [h] => mars
    [s] => danny
    [y] => allen
)

### ==array_search 搜尋==

$row = ['bryan', 'list',  'mars', 'allen', 'danny'];

echo (array_search('list', $row));

//顯示 key位置

1

### ==array_unique 過濾重複==

$row = ['bryan', 'list',  'danny', 'allen', 'danny'];

//過濾重複 只留最後一個值

array_unique($row);

print_r($row);

//顯示

Array
(
    [0] => bryan
    [1] => list
    [2] => danny
    [3] => allen
    [4] => danny
)

### ==array_sum 總數==

$row=[3,5,10,12,200];

echo(array_sum($row));

//顯示
230

### ==count 計算array總數==

$row=[3,5,10,12,200];

echo(count($row));

//顯示

5