对多维数组按某值排序的php代码

2. $arr = array(
3. "0" => array(line_num => "10", occur_time => "2007-11-19 10:25:04+08"),
4. 　　 "1" => array(line_num => "9", occur_time => "2007-11-19 10:25:04+08"),
5. 　"2" => array(line_num => "25", occur_time => "2007-11-19 10:25:04+08")
6. );
7. print_r($arr);
8. echo "
   ";
9. echo "
   ";
10. echo "
    ";
11. uasort( $arr,create_function('$a, $b', 'return $a[\'line_num\'] < $b[\'line_num\'];') );
12. print_r($arr);
13. echo "
    ";
14. echo "
    ";
15. echo "
    ";
16. foreach($arr as $key => $value) {
17. $ar[] = $value;
18. }
19. print_r($ar);
20. ?>

输出结果： Array ( [0] => Array ( [line_num] => 10 [occur_time] => 2007-11-19 10:25:04+08 ) [1] => Array ( [line_num] => 9 [occur_time] => 2007-11-19 10:25:04+08 ) [2] => Array ( [line_num] => 25 [occur_time] => 2007-11-19 10:25:04+08 ) )


Array ( [2] => Array ( [line_num] => 25 [occur_time] => 2007-11-19 10:25:04+08 ) [0] => Array ( [line_num] => 10 [occur_time] => 2007-11-19 10:25:04+08 ) [1] => Array ( [line_num] => 9 [occur_time] => 2007-11-19 10:25:04+08 ) )


Array ( [0] => Array ( [line_num] => 25 [occur_time] => 2007-11-19 10:25:04+08 ) [1] => Array ( [line_num] => 10 [occur_time] => 2007-11-19 10:25:04+08 ) [2] => Array ( [line_num] => 9 [occur_time] => 2007-11-19 10:25:04+08 ) )

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