Get all values from array no matter array is multi dimension. Also you can maintain array dimension if you need.

array_recursive_value.php

<?php

/**
 * Recursively get all values from array
 * 
 * @param  array  $array
 * @param  bool   $merge  maintain array dimension
 * @return array
 * 
 * @author Mohammed Mudasir <md.hyphen@gmail.com>
 * @license MIT
 */
function array_recursive_value(array $array, $merge = true)
{
    $values = array();

    foreach ($array as $key => $value) {
        $values[] = is_array($value) ? array_recursive_value($value, $merge) : $value; 
    }
    
    if (! $merge) {
    	return $values;
    }

    // Get values for merge if value is string then make it as array with first
    // pocket will be string.
    $valuesForMerge = function () use ($values) {
    	return array_map(function ($value) {
	    	return is_array($value) ? $value : [$value];
	    }, $values);
    };

    return call_user_func_array('array_merge', $valuesForMerge());
}