一个前臂有三个阵列 - Three arrays in one foreach?

Three arrays in one foreach?

本文关键字：阵列三个一个 | 更新日期: 2023-09-27

我正在开发一个小型的"用户列表"系统，我需要foreach三个数组。以下是我"想做的事"：

<?php
$users = array("user1", "user2");
$descriptions = array("user1 description", "user2 description");
$socials = array("skype: user1", "skype: user2");
foreach ($users as $user && $description as $description && $socials as $social) {
echo "<tr><td style='"width:60px'"><img width='"50'" height='"50'" alt='"{$user}'s profile picture'" src='"blog/users/{$user}/avatar.png'"><br/>{$user}</td><td style='"width:70%'">{$descriptions}</td><td style='"text-align:left'">{$social}</td></tr>}";}
?>

我该怎么做？

您可以将array_map与null一起使用。首先，您可以从这三个参数中构建一个多维数组，然后使用foreach 遍历它

$combined = array_map(null, $users, $descriptions, $socials);
foreach ($combined as $user) {
    $username = $user[0];
    $description = $user[1];
    $social = $user[2];
    echo "<tr><td style='"width:60px'"><img width='"50'" height='"50'" alt='"{$username}'s profile picture'" src='"blog/users/{$username}/avatar.png'"><br/>{$username}</td><td style='"width:70%'">{$description}</td><td style='"text-align:left'">{$social}</td></tr>}";
}

$users = array("user1", "user2"); 
$descriptions = array("user1 description", "user2 description"); 
$socials = array("skype: user1", "skype: user2"); $i = 0; 
foreach ($users as $user)
{ 
  $html .= "{$user}{$descriptions[$i]}{$socials[$i]}"; 
  $i++;
}

运行for循环，一次遍历所有3个数组。

for ($i = 0; $i < count($users); $i++)
{
    echo $users[$i].'<br />'; //get location $i of array $users
    echo $descriptions[$i].'<br />'; //get location $i of array $descriptions
    echo $socials[$i].'<br />'; //get location $i of array $socials
}

您可以使用foreach中的key来调用另一个数组（假设它们匹配）：

<?php
$users = array("user1", "user2");
$descriptions = array("user1 description", "user2 description");
$socials = array("skype: user1", "skype: user2");
foreach ($users as $key=>$user) {
echo "<tr><td style='"width:60px'"><img width='"50'" height='"50'" alt='"{$user}'s profile picture'" src='"blog/users/{$user}/avatar.png'"><br/>{$user}</td><td style='"width:70%'">{$descriptions[$key]}</td><td style='"text-align:left'">{$social[$key]}</td></tr>}";}

另外，不建议在一个echo中有这么多行代码。我更喜欢heredoc方法，它将所有内容"分解"，这样您就可以直观地阅读（并进行更改）：

foreach ($users as $key=>$user) {
    echo <<<EOD
    <tr>
        <td style="width:60px"><img width="50" height="50" alt="{$user}'s profile picture" src="blog/users/{$user}/avatar.png"><br>{$user}</td>
        <td style="width:70%">{$descriptions[$key]}</td>
        <td style="text-align:left">{$social[$key]}</td>
    </tr>
EOD;
}