1. array_column 返回輸入數(shù)組中某個(gè)單一列的值。
2. array_filter 用回調(diào)函數(shù)過濾數(shù)組中的元素。
3. array_map 將用戶自定義函數(shù)作用到給定數(shù)組的每個(gè)值上，返回新的值。
4. array_walk_recursive 對(duì)數(shù)組中的每個(gè)成員遞歸地應(yīng)用用戶函數(shù)。
5. extract (從數(shù)組中將變量導(dǎo)入到當(dāng)前的符號(hào)表),  compact (創(chuàng)建一個(gè)包含變量名和它們的值的數(shù)組)
6. uasort 使用用戶自定義的比較函數(shù)對(duì)數(shù)組中的鍵值進(jìn)行排序。

1. array_column 返回輸入數(shù)組中某個(gè)單一列的值。

類似功能有

1.1 Yii2 中的 ArrayHelper::index($array, 'id');

1.2 Yii2 中的 $query->select(['last_name', 'id'])->indexBy('id')->column();

// 可能從數(shù)據(jù)庫(kù)中返回?cái)?shù)組
$a = array(
 array(
  'id' => 5698,
  'first_name' => 'Peter',
  'last_name' => 'Griffin',
 ),
 array(
  'id' => 4767,
  'first_name' => 'Ben',
  'last_name' => 'Smith',
 ),
 array(
  'id' => 3809,
  'first_name' => 'Joe',
  'last_name' => 'Doe',
 )
);
$last_names = array_column($a, 'last_name', 'id');
print_r($last_names);

輸出結(jié)果:

Array
(
    [5698] => Griffin
    [4767] => Smith
    [3809] => Doe
)

2. array_filter 用回調(diào)函數(shù)過濾數(shù)組中的元素。

function test_odd($var)
{
  return($var  1);
}
$a1=array("a","b",2,3,4);
print_r(array_filter($a1,"test_odd"));

輸出:

Array
(
    [2] => 2
    [3] => 3
    [4] => 4
)

3. array_map 將用戶自定義函數(shù)作用到給定數(shù)組的每個(gè)值上，返回新的值。

此函數(shù)有點(diǎn)類似與 array_walk_recursive , 只是多寫了一步遞歸

 function myfunction($v) {
   if (is_array($v)) {
     return array_map("myfunction", $v);
   }
  return($v * $v);
} 
 $a = array(1, 2, 3, 4, 5, 6 => [2, 3]);
print_r(array_map("myfunction", $a));

輸出:

Array
(
    [0] => 1
    [1] => 4
    [2] => 9
    [3] => 16
    [4] => 25
    [6] => Array
        (
            [0] => 4
            [1] => 9
        )

)

 function myfunction($v1, $v2) {
  if ($v1 === $v2) {
     return "same";
   }
   return "different";
 } 
 $a1 = array("Horse", "Dog", "Cat");
 $a2 = array("Cow", "Dog", "Rat");
 print_r(array_map("myfunction", $a1, $a2));

輸出:

Array
(
    [0] => different
    [1] => same
    [2] => different

4. array_walk_recursive 對(duì)數(shù)組中的每個(gè)成員遞歸地應(yīng)用用戶函數(shù)。

此函數(shù)有點(diǎn)類似與 array_map, 只是省去了寫遞歸

 function myfunction($value, $key, $p) {
   if ($value == 'xxx') {
     $value = $p;
   }
 }
 $a = array("a" => "red", "b" => "green", "c" => "blue", 'd' => ['x' => 'xxx', 'y' => 'yyy']);
 array_walk_recursive($a, "myfunction", 'green');
 print_r($a);

輸出:

Array
(
    [a] => red
    [b] => green
    [c] => blue
    [d] => Array
        (
            [x] => green
            [y] => yyy
        )

)

5. extract (從數(shù)組中將變量導(dǎo)入到當(dāng)前的符號(hào)表),  compact (創(chuàng)建一個(gè)包含變量名和它們的值的數(shù)組)

 $a = "Original";
$my_array = array("a" => "Cat","b" => "Dog", "c" => "Horse");
 extract($my_array);
 echo "\$a = $a; \$b = $b; \$c = $c";

輸出:

$a = Cat; $b = Dog; $c = Horse

 $firstname = "Peter";
 $lastname = "Griffin";
 $age = "41";
$result = compact("firstname", "lastname", "age");
 print_r($result);

輸出:

Array
(
    [firstname] => Peter
    [lastname] => Griffin
    [age] => 41
)

6. uasort 使用用戶自定義的比較函數(shù)對(duì)數(shù)組中的鍵值進(jìn)行排序(可以對(duì)二維數(shù)組排序)。

$arr2 = [
  [
    'id' => 3,
    'age' => 33,
  ],
  [
    'id' => 2,
    'age' => 44,
  ],
  [
    'id' => 1,
    'age' => 22,
  ],
];
//按age字段升序排序
uasort($arr2, function($a, $b) {
  $field = 'age';
  if ($a[$field] == $b[$field]){
    return 0;
  }
  return ($a[$field]  $b[$field]) ? -1 : 1;
});
print_r($arr2);

輸出:

Array
(
    [2] => Array
        (
            [id] => 1
            [age] => 22
        )

    [0] => Array
        (
            [id] => 3
            [age] => 33
        )

    [1] => Array
        (
            [id] => 2
            [age] => 44
        )

)

總結(jié)

以上所述是小編給大家介紹的六個(gè)比較好用的php數(shù)組Array函數(shù)，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！