检查关联数组是否包含值，并检索数组中的键/位置 [英] Check if associative array contains value, and retrieve key / position in array

问题描述

我正在努力解释我要在这里做的事情，如果让我感到困惑，请您道歉..我也很困惑自己

I'm struggling to explain what I want to do here so apologies if I confuse you.. I'm just as confused myself

我有一个像这样的数组:

I have an array like so:

$foo = array(
    array('value' => 5680, 'text' => 'Red'), 
    array('value' => 7899, 'text' => 'Green'), 
    array('value' => 9968, 'text' => 'Blue'), 
    array('value' => 4038, 'text' => 'Yellow'),
)

我想检查数组是否包含值，例如7899，并在上面的示例中也获得了链接到该值"Green"的文本.

I want to check if the array contains the value e.g. 7899 and also get the text linked to that value "Green" in the example above.

推荐答案

尝试类似的方法

$foo = array(
    array('value' => 5680, 'text' => 'Red'), 
    array('value' => 7899, 'text' => 'Green'), 
    array('value' => 9968, 'text' => 'Blue'), 
    array('value' => 4038, 'text' => 'Yellow'),
);

$found = current(array_filter($foo, function($item) {
    return isset($item['value']) && 7899 == $item['value'];
}));

print_r($found);

哪个输出

Array
(
    [value] => 7899
    [text] => Green
)

此处的键是array_filter.如果搜索值7899不是静态的，则可以使用诸如function($item) use($searchValue)之类的东西将其带到闭包中.请注意，array_filter返回一个元素数组，这就是为什么我将其通过current

The key here is array_filter. If the search value 7899 is not static then you could bring it in to the closure with something like function($item) use($searchValue). Note that array_filter is returning an array of elements which is why I pass it through current

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