仅在关联php数组中保留具有特定名称模式的元素，并从数组中删除其余元素 - Only keep elements with a certain name pattern in an associative php array and remove the remaining elements from the array

Only keep elements with a certain name pattern in an associative php array and remove the remaining elements from the array

我有一个关联Php数组，它在print_r

上看起来像这样

    Array ( [dyna[0]] => one [add[0]] =>   ⇊   [rem[0]] => Delete Column [dyna[1]] => two [add[1]] =>   ⇊   [rem[1]] => Delete Column [dyna[2]] => three [add[2]] =>   ⇊   [rem[2]] => Delete Column [dyna[3]] => four [add[3]] =>   ⇊   [rem[3]] => Delete Column [input[1]] => numbers [store_last] => 6 )

问:我想只保留数组中有键的元素-> dyna[0]， dyna[1]，并删除剩下的键和值，其中有键，如add[0]和rem[1]。

这可能吗?请建议

谢谢。

array_filter允许基于用户函数的简单数组过滤:

    $oldArray['dyna[0]']='a';
    $oldArray['zzzzzzzzzzzzzz']='b';
    $oldArray['dyna[1]']='c';
    $oldArray['zzzzzzzzzzzz']='d';
print_r($oldArray);

$newArray = array_filter(
    $oldArray,
    function ($key) {
         return preg_match('/^dyna'['d+']/', $key); //regular expression to match key name
    },
    ARRAY_FILTER_USE_KEY
);
print_r($newArray);

//输出:

Array
(
    [dyna[0]] => a
    [zzzzzzzzzzzzzz] => b
    [dyna[1]] => c
    [zzzzzzzzzzzz] => d
)
Array
(
    [dyna[0]] => a
    [dyna[1]] => c
)