检查值是否存在于多维数组中 [英] check if value exists in multidimensional array

问题描述

我想使我的类别菜单响应所显示的项目.这些项目具有多个类别，因此可以激活多个类别菜单链接.项目所属的类别是在多维数组中包含的php文件中指定的.

I want to make my category menu responsive to the projects displayed. The projects have multiple categories so multiple category-menu-links can be active. Whichever category the project belongs to is specified on an included php file in an multidimensional array…

例如

$allProjects = array(
    'project1' => array('corporate'),
    'project2' => array('corporate', 'print'),
    'project3' => array('web')
);

现在，我想检查每个类别是否是数组$ allProjects中数组'project1'，'project2'，'project3'...的值，如果是，则回显'active'.

Now I want to check for each category if it is a value of the array 'project1', 'project2', 'project3',… within the array $allProjects and if so echo 'active'.

到目前为止，我有...

So far I have…

<?php if (($_GET['cat'] == 'corporate')) {echo 'active';}; || if (isset ($_GET['project'])) {if in_array('corporate', $_GET['project']) {echo 'active';}; ?>

这有意义吗?

更新:

我需要在特定键(第二级数组)处检查多维数组是否存在值(第三级数组)

What I need is to check in the multidimensional array at a specific key (2nd level array) if a value exists (3rd level array)

所以我猜是这样的……

$project = $_GET('project');
$category = $_GET('cat');

foreach ($allProjects as $project => $categories) {
if in_array($category, $project);
echo 'yes';
}

我使用$ project(上面定义的变量)作为键，但这不起作用.它期望参数为数组.我只想使用项目名称(在$ project中定义)作为in_array函数的键，并检查值中$ category的出现.

I use $project, variables defined above, as key but that doesn't work. It expects the parameters to be arrays. All I want is to use the name of the project (defined in $project) as a key for the in_array function and check for appearance of $category in the values.

感谢帮助

推荐答案

您可以使用 array_search()在数组中搜索特定值.如果找到该函数，则返回与该值对应的键，否则返回 false .

You can use array_search() to search for a specific value in your array. This function returns the key corresponding to the value if found, false otherwise.

所以您要做的是循环每个子数组:

So what you will want to do is loop each subarray:

$category = $_GET['cat'];
$allProjects = array(
    'project1' => array('corporate'),
    'project2' => array('corporate', 'print'),
    'project3' => array('web')
);

foreach ($allProjects as $projectName => $categories) {
    $categoryIndex = array_search($category, $categories);
    if ($categoryIndex !== false) {
        echo 'active: ' . $categoryIndex;
        // Do something with $categoryIndex and $projectName here
    }
}

更新:

看起来这是您的答案:

$project = $_GET('project');
$category = $_GET('cat');

if (isset($allProjects[$project]) && in_array($category, $allProjects[$project])) {
    echo 'yes';
}

这篇关于检查值是否存在于多维数组中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！