How Can I Flatten Multidimensional Arrays in PHP?

PHP Flatten Multidimensional Arrays

flattening a multidimensional array into a single dimension can be essential for some data processing tasks. PHP offers a convenient way to perform this conversion using array manipulation functions.

Solution Using array_merge

$array = [
    [1, 2, 3],
    [4, 5, 6],
];

$result = call_user_func_array('array_merge', $array);

echo "<pre class="brush:php;toolbar:false">";
print_r($result); // Output: [1, 2, 3, 4, 5, 6]

The call_user_func_array() function allows you to pass an array of arguments to a function. In this case, we use it to call the array_merge() function with each element of the multidimensional array as an argument.

Solution Using Recursive Function

function array_flatten($array) {
    $return = [];
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $return = array_merge($return, array_flatten($value));
        } else {
            $return[$key] = $value;
        }
    }
    return $return;
}

$array = [
    [1, 2, 3],
    [4, 5, 6],
];

$result = array_flatten($array);

echo "<pre class="brush:php;toolbar:false">";
print_r($result); // Output: [1, 2, 3, 4, 5, 6]

This recursive function works by iterating through the array and recursively calling itself on any array elements it encounters. It merges the results from each recursive call into the final flattened array.

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