How to convert a two-dimensional array into a one-dimensional array in php

php How to convert a two-dimensional array into a one-dimensional array: first create a PHP sample file; then define a "reduce" method; then use "array_walk_recursive" and other functional methods to achieve the conversion.

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php convert two-dimensional array to one-dimensional array

The code is as follows:

/*
@reduce() 多维维数组变成一维数组
@$array 数组
*/
    public function reduce($array)
    {
        $return = [];
        array_walk_recursive($array, function ($x, $index) use (&$return) {
            $return[] = $x;
        });
        return $return;
    }

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