I have the following array

[0] => Array
    (
  开发者_StackOverflow中文版      [id] => 229
        [val] => 2
    )

[3] => Array
    (
        [id] => 237
        [val] => 1
    )

[4] => Array
    (
        [id] => 238
        [val] => 6
    )

I need to sort this array according to the val values in the array, and do not know how to accomplish this?

function cmp($a, $b)
{
    if ($a["val"] == $b["val"]) {
        return 0;
    }
    return ($a["val"] < $b["val"]) ? -1 : 1;
}

usort($yourarray, "cmp");

Read this for more information.

array_multisort can help with this, example 3 presents a similar problem and solution.

This would help - http://www.informit.com/articles/article.aspx?p=341245&seqNum=7

You can use array_multisort()

Examples here: http://www.php.net/manual/en/function.array-multisort.php

The Example #3 Sorting database results is what you want. Might be easier if you are not familiar with callback functions and usort().

use this function to sort array accroding to your need

function sksort(&$array, $subkey="id",$sort_ascending=false)
{
    if (count($array))
        $temp_array[key($array)] = array_shift($array);

    foreach($array as $key => $val){
        $offset = 0;
        $found = false;
        foreach($temp_array as $tmp_key => $tmp_val)
        {
            if(!$found and strtolower($val[$subkey]) > strtolower($tmp_val[$subkey]))
            {
                $temp_array = array_merge(
                    (array)array_slice($temp_array,0,$offset),
                    array($key => $val),
                    array_slice($temp_array,$offset)
                );
                $found = true;
            }
            $offset++;
        }
        if(!$found) $temp_array = array_merge($temp_array, array($key => $val));
    }

    if ($sort_ascending) $array = array_reverse($temp_array);

    else $array = $temp_array;
}

========================================================================== now use this function in ur array

sksort($arrayname, "val"); /* for ascending */

sksort($arrayname, "val", true); /* for descending */