PHP判断数组Array的维度(已封装函数)

private static function array_depth($array) {
if(!is_array($array)) return 0;
$max_depth = 1;
foreach ($array as $value) {
if (is_array($value)) {
$depth = array_depth($value) + 1;

if ($depth > $max_depth) {
$max_depth = $depth;
}
}
}
return $max_depth;
}