PHP multidimensional array to single array sort by value

Question

I have one multidimensional array and this array I have to convert into single array with sort. I tried to use call_user_func_array('array_merge', $ranges); this function. After using this function get single array. When I use sort() function on single array then show output 1.

My array

    Array
(
    [range1] => Array
        (
            [0] => 1113
            [1] => 2224 
        )

    [range2] => Array
        (
            [0] =>  500
            [1] => 1112
        )

    [range3] => Array
        (
            [0] => 2225
            [1] => 4446
        )
)

Use call_user_func_array('array_merge', $ranges); output

    Array
(
    [0] => 1113
    [1] => 2224 
    [2] =>  500
    [3] => 1112
    [4] => 2225
    [5] => 4446
)

Now I am use sort() function then show 1. Why this happen?

Answer 1

You're almost there. In sort() function, array is passed by reference, and return true on success and false on failure. So you should apply sort() function on the flattened array like this:

$array = call_user_func_array('array_merge', $ranges);
sort($array);

// display sorted array
var_dump($array);

---

Here's the reference:

• http://php.net/manual/en/function.sort.php

Answer 2

sort() function work by reference and returning true or false so no need to asign result to variable because source variable is changed by reference