预置到多维关联数组

Question

我是 PHP 初学者，有一个问题：

我有一个多维关联数组：

array(
        "X" => array( "x1" => "1", "x2" => "2", "x3" => "3" ),
        "Y" => array( "y1" => "1", "y2" => "2", "y3" => "3" ),
        "Z" => array( "z1" => "1", "z2" => "2", "z3" => "3" )
)

并且需要在每个元素 X、Y、Z 前添加 "" => ""，因此它将是：

array(
            "X" => array( "" => "", "x1" => "1", "x2" => "2", "x3" => "3" ),
            "Y" => array( "" => "", "y1" => "1", "y2" => "2", "y3" => "3" ),
            "Z" => array( "" => "", "z1" => "1", "z2" => "2", "z3" => "3" )
)

X、Y、Z名称经常变化，所以我需要先获取一个键名，然后再添加新值。

我想以某种方式使用 foreach。我正在尝试，但可以实现。

谢谢

Answer 1

检查以下代码：

<?php
$temp = array(
        "X" => array( "x1" => "1", "x2" => "2", "x3" => "3" ),
        "Y" => array( "y1" => "1", "y2" => "2", "y3" => "3" ),
        "Z" => array( "z1" => "1", "z2" => "2", "z3" => "3" )
);
$you_array = array(); 
foreach($temp  as $k=>$v){

    array_unshift($v, " "); 
    $you_array[$k] = $v;
}
print_r($you_array);
?>

输出：

Array ( 

[X] => Array ( [0] => [x1] => 1 [x2] => 2 [x3] => 3 ) 

[Y] => Array ( [0] => [y1] => 1 [y2] => 2 [y3] => 3 ) 

[Z] => Array ( [0] => [z1] => 1 [z2] => 2 [z3] => 3 ) 

)

Answer 2

您可以使用 array_unshift 向数组添加新元素。

正如您已经提到的，创建一个 foreach 循环并将新元素添加到每个子数组：

$new = array("new_key" => "");
foreach ($yourArray as $key => $value)
   array_unshift($yourArray[$key], $new);

注意：您的新元素需要一个键值。空键（如您提到的）是不可能的。如果您只是添加一个没有键 array("") 的新元素，它将添加一个数字键 (0 => "")。现有数字键将修改为从零开始计数。

Answer 3

 <?php
    $temp = array(
       "X" => array( "x1" => "1", "x2" => "2", "x3" => "3" ),
       "Y" => array( "y1" => "1", "y2" => "2", "y3" => "3" ),
       "Z" => array( "z1" => "1", "z2" => "2", "z3" => "3" )
    );
    $you_array = array(); 
    foreach($temp  as $k=>$v){

       $v = array_merge([""=>""],$v); 
       $you_array[$k] = $v;
    }
    print_r($you_array);
 ?>

Answer 4

我想这就是您要找的

[akshay@localhost tmp]$ cat test.php
<?php
$array=array(
        "X" => array( "x1" => "1", "x2" => "2", "x3" => "3" ),
        "Y" => array( "y1" => "1", "y2" => "2", "y3" => "3" ),
        "Z" => array( "z1" => "1", "z2" => "2", "z3" => "3" )
);

// Input
print_r($array);

// & reference
foreach($array as &$sub_array)
{
    $sub_array = array(""=>"")+$sub_array;
}

// Output
print_r($array);
?>

输出

[akshay@localhost tmp]$ php test.php
Array
(
    [X] => Array
        (
            [x1] => 1
            [x2] => 2
            [x3] => 3
        )

    [Y] => Array
        (
            [y1] => 1
            [y2] => 2
            [y3] => 3
        )

    [Z] => Array
        (
            [z1] => 1
            [z2] => 2
            [z3] => 3
        )

)
Array
(
    [X] => Array
        (
            [] => 
            [x1] => 1
            [x2] => 2
            [x3] => 3
        )

    [Y] => Array
        (
            [] => 
            [y1] => 1
            [y2] => 2
            [y3] => 3
        )

    [Z] => Array
        (
            [] => 
            [z1] => 1
            [z2] => 2
            [z3] => 3
        )

)

预置到多维关联数组

Prepend to multidimensional associative array

php

arrays

associative

multidimensional-array