1. array_column 返回输入数组中某个单一列的值。2. array_filter 用回调函数过滤数组中的元素。3. array_map 将用户自定义函数作用到给定数组的每个值上，返回新的值。4. array_walk_recursive 对数组中的每个成员递归地应用用户函数。5. extract (从数组中将变量导入到当前的符号表),  compact (创建一个包含变量名和它们的值的数组)6. uasort 使用用户自定义的比较函数对数组中的键值进行排序。

1. array_column 返回输入数组中某个单一列的值。

类似功能有

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

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

// 可能从数据库中返回数组$a = array( array(  "id" => 5698,  "first_name" => "Peter",  "last_name" => "Griffin", ), array(  "id" => 4767,  "first_name" => "Ben",  "last_name" => "Smith", ), array(  "id" => 3809,  "first_name" => "Joe",  "last_name" => "Doe", ));$last_names = array_column($a, "last_name", "id");print_r($last_names);

输出结果:

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

2. array_filter 用回调函数过滤数组中的元素。

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

输出:

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

3. array_map 将用户自定义函数作用到给定数组的每个值上，返回新的值。

此函数有点类似与 array_walk_recursive , 只是多写了一步递归

 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));

输出:

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));

输出:

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

4. array_walk_recursive 对数组中的每个成员递归地应用用户函数。

此函数有点类似与 array_map, 只是省去了写递归

 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);

输出:

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

)

5. extract (从数组中将变量导入到当前的符号表),  compact (创建一个包含变量名和它们的值的数组)

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

输出:

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

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

输出:

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

6. uasort 使用用户自定义的比较函数对数组中的键值进行排序(可以对二维数组排序)。

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

输出:

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

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

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

)

总结

以上所述是小编给大家介绍的六个比较好用的php数组Array函数，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网页设计网站的支持！