Function in PHP to throw out empty values from an array (and optional drop values which have specified keys passed-in)

array_clear.php

<?php

/**
 * Clear an array of empty values and specified keys
 *
 * @param  array $keys array keys to explicitly remove regardless
 * @return array the trimmed down array
 */
function array_clear($array, $keys = [])
{
    foreach ($array as $key => $value) {
        if (is_array($value)) {
            // Recursively clear any nested arrays
            $value = array_clear($value, $keys);
        }

        // Remove empty values and specified keys
        if (empty($value) && 0 !== $value || in_array($key, $keys, true)) {
            unset($array[$key]);
        }
    }
    return $array;
}