How can multi-dimensional arrays be efficiently incorporated into a regex pattern for variable filtering in PHP?

Multi-dimensional arrays can be efficiently incorporated into a regex pattern for variable filtering in PHP by using the `array_walk_recursive` function to iterate through all the elements of the array and apply the regex pattern to each element. This allows for filtering of variables at any level of the multi-dimensional array. 

$array = [
    'key1' => 'value1',
    'key2' => [
        'subkey1' => 'subvalue1',
        'subkey2' => 'subvalue2'
    ]
];

$pattern = '/^[a-zA-Z0-9]+$/'; // Regex pattern to filter variables

array_walk_recursive($array, function(&$value) use ($pattern) {
    if (preg_match($pattern, $value) !== 1) {
        $value = ''; // Replace non-matching values with an empty string
    }
});

print_r($array);

Keywords

multi-dimensional arrays regex pattern variable filtering PHP efficient

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