SELECT * FROM table WHERE username LIKE  '%zhangsan%' ORDER BY LOCATE('zhangsan',username) ASC , cardid DESC

------解决方案--------------------
人家要对数组排序，那就对数组排序呗
PHP code
$list = array(
0=>array('cardid'=>1001,'username'=>'zhangsan'),
1=>array('cardid'=>1002,'username'=>'zhangsanfeng'),
2=>array('cardid'=>1003,'username'=>'SBzhangsan'),
3=>array('cardid'=>1005,'username'=>'SBzhangsanisyou'),
4=>array('cardid'=>1007,'username'=>'zhangsan'),
);
$q = 'zhangsan';
foreach($list as $v) {
  $r1[] = $v['cardid'];
  list($r2[], $r3[]) = explode($q, $v['username']);
}
array_multisort($r2, $r3, $r1, SORT_DESC, $list);
print_r($list);

------解决方案--------------------
楼主给的结果有悖于自己的描述噢。

PHP code
"sort.php" 29L, 801C written                                                                                                                                   
[User:root Time:02:58:29 Path:/home/liangdong/php]$ php sort.php 
Array
(
    [4] => Array
        (
            [cardid] => 1007
            [username] => zhangsan
        )

    [1] => Array
        (
            [cardid] => 1002
            [username] => zhangsanfeng
        )

    [0] => Array
        (
            [cardid] => 1001
            [username] => zhangsan
        )

    [3] => Array
        (
            [cardid] => 1005
            [username] => SBzhangsanisyou
        )

    [2] => Array
        (
            [cardid] => 1003
            [username] => SBzhangsan
        )

)
[User:root Time:02:58:31 Path:/home/liangdong/php]$ cat sort.php 
<?php
$list = array(
                        array('cardid'=>1001,'username'=>'zhangsan'),
                        array('cardid'=>1002,'username'=>'zhangsanfeng'),
                        array('cardid'=>1003,'username'=>'SBzhangsan'),
                        array('cardid'=>1005,'username'=>'SBzhangsanisyou'),
                        array('cardid'=>1007,'username'=>'zhangsan'),
                );
$name = "zhangsan";

uasort($list, function($left, $right) {
                                global $name;
                                $lndx = strpos($left['username'], $name);
                                $rndx = strpos($right['username'], $name);
                                $lid = $left['cardid'];
                                $rid = $right['cardid'];
                                if ($lndx === false && $rndx !== false || 
                                        $lndx !== false && $rndx === false) { // 不包含名字的算小的
                                        return $lndx === false ? -1 : 1;
                                }
                                if ($lndx == $rndx) {
                                        return $rid - $lid;
                                } e