php多维数组排序方案。按照姓名 首字符 等排序

//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);