php 多维数组排序

//定义一个学生数组



$students = array(

	256=>array('name'=>'jon','grade'=>98.5),

	2=>array('name'=>'vance','grade'=>85.1),

	9=>array('name'=>'stephen','grade'=>94.0),

	364=>array('name'=>'steve','grade'=>85.1),

	68=>array('name'=>'rob','grade'=>74.6),

);



//按照名称进行排序

function name_sort($x, $y)

{

    return strcasecmp($x['name'],$y['name']);

}



//按照成绩进行排序

function grade_sort($x,$y)

{

    return ($x['grade'] > $y['grade']);

}



//应用

uasort($students, name_sort);



uasort($students, grade_sort);