array_walk_recursive

PHP 5, PHP 7, PHP 8

array_walk_recursive - Apply a user function recursively to every member of an array

Manual

array_walk_recursive( array|objectarray, callable$callback, [mixed$arg = null] ): bool

Applies the user-defined callback function to each element of the array. This function will recurse into deeper arrays.

array: The input array.
callback: Typically, callback takes on two parameters. The array parameter's value being the first, and the key/index second.

Note:

If callback needs to be working with the actual values of the array, specify the first parameter of callback as a reference. Then, any changes made to those elements will be made in the original array itself.
arg: If the optional arg parameter is supplied, it will be passed as the third parameter to the callback.

Returns true on success or false on failure.

PHP Version: