PHP sort array alphabetically then numerically?

Question

I have an array..

$test = array(\"def\", \"yz\", \"abc\", \"jkl\", \"123\", \"789\", \"stu\");

if I run sort() on it I get

Answer 1

In the following code is separate the data in two arrays: one is numerical the other is not and sort it and merge it.

$arr1 = $arr2 = array();

$foreach ($arr as $val) {

if (is_numeric($val)) {array_push($arr2, $val); } 
else {array_push($arr1, $val);}

} 

so you have to separate arrays whit numeric and non-numeric

sort($arr2);
sort($arr1);

$test = array_merge($arr2,$arr1);