What are some alternative methods to modify inner arrays in a multidimensional array in PHP?

When working with multidimensional arrays in PHP, modifying inner arrays can be achieved using various methods such as array_map(), array_walk(), or simply iterating through the array using foreach loop. These functions allow you to apply a callback function to each element of the inner arrays and make modifications as needed. 

// Example of using array_map() to modify inner arrays in a multidimensional array
$multiDimArray = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

$modifiedArray = array_map(function($innerArray) {
    return array_map(function($value) {
        return $value * 2; // Multiply each value by 2
    }, $innerArray);
}, $multiDimArray);

print_r($modifiedArray);

Keywords

array_map array_walk array_walk_recursive array_column array_replace_recursive

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