Question

我已经研究了这个，但找到的答案并没有解决我的问题。我想将所有用户名项更改为'kk'，但之后打印数组显示没有任何更改。可能有什么不对？

<?php
$myArray = Array(
    0 => Array(
        'sender' => kk,
        'message' => hhiui,
        'timestamp' => '2017-02-04 10:04:57',
        'username' => '',
        'msgtype' => 0,
        'threadid' => 20737047302042017230457
    ) ,
    1 => Array(
        'sender' => kk,
        'message' => hhiui,
        'timestamp' => '2017-02-04 10:04:57',
        'username' => '',
        'msgtype' => 0,
        'threadid' => 20737047302042017230457
    ) ,
    2 => Array(
        'sender' => kk,
        'message' => hhiui,
        'timestamp' => '2017-02-04 10:04:57',
        'username' => '',
        'msgtype' => '16',
        'threadid' => 20737047302042017230457
    )
);

foreach($myArray as $value)
    {
    $value['username'] = "kk";
    }

print_r($myArray);

它只是给了我：

Array
(
    [0] => Array
        (
            [sender] => kk
            [message] => hhiui
            [timestamp] => 2017-02-04 10:04:57
            [username] => 
            [msgtype] => 0
            [threadid] => 2.0737047302042E+22
        )

    [1] => Array
        (
            [sender] => kk
            [message] => hhiui
            [timestamp] => 2017-02-04 10:04:57
            [username] => 
            [msgtype] => 0
            [threadid] => 2.0737047302042E+22
         )

     [2] => Array
         (
             [sender] => kk
             [message] => hhiui
             [timestamp] => 2017-02-04 10:04:57
             [username] => 
             [msgtype] => 16
             [threadid] => 2.0737047302042E+22
        )

)
Array
(
     [2] => Array
         (
             [sender] => kk
             [message] => hhiui
             [timestamp] => 2017-02-04 10:04:57
             [username] => 
             [msgtype] => 16
             [threadid] => 2.0737047302042E+22
         )

Answer 1

你应该这样做：

foreach ($myArray as &$value)
{
   $value['username'] = "kk";
}

注意＆amp;符号。它使您能够更改阵列。

Answer 2

使用循环中reference operator &之前的$value来编辑数组行

PHP中的引用是一种访问相同变量内容的方法不同的名字。 http://php.net/manual/en/language.references.whatare.php

<?php
    $myArray = Array(
        0 => Array(
            'sender' =>"kk",
            'message' => "hhiui",
            'timestamp' => '2017-02-04 10:04:57',
            'username' => '',
            'msgtype' => 0,
            'threadid' => 20737047302042017230457
        ) ,
        1 => Array(
            'sender' => "kk",
            'message' => "hhiui",
            'timestamp' => '2017-02-04 10:04:57',
            'username' => '',
            'msgtype' => 0,
            'threadid' => 20737047302042017230457
        ) ,
        2 => Array(
            'sender' => "kk",
            'message' => "hhiui",
            'timestamp' => '2017-02-04 10:04:57',
            'username' => '',
            'msgtype' => '16',
            'threadid' => 20737047302042017230457
        )
    );

    foreach($myArray as &$value)
    {
          $value['username'] = "kk";
    }

    print_r($myArray);

Answer 3

这样做：

foreach ($myArray as $key=>$value)
{
$myArray[$key]['username'] = "kk";
}

PHP在多维数组中更改项的值

3 个答案: