php数组排序usort uksort sort函数
php教程数组排序usort uksort sort函数
对数组排序
usort() 函数使用用户自定义的函数对数组排序。
*/
function cmp($a, $b) //用户自定义回调函数
{
if($a==$b) //如果两个参数相等
{
return 0; //返回0
}
return($a>$b)?-1:1; //如果第1个参数大于第2个返回1，否则-1
}
$a=array(3,2,5,6,1); //定义一个数组
usort ($a,"cmp"); //使用自定义函数对数组排序
foreach($a as $key=>$value) //循环输出排序后的键值对
{
echo "$key:$valuen";
}
/*
注释：如果两个元素比较结果相同，则它们在排序后的数组中的顺序未经定义。到 php 4.0.6 之前，用户自定义函数将保留这些元素的原有顺序。但是由于在 4.1.0 中引进了新的排序算法，结果将不是这样了，因为对此没有一个有效的解决方案。
*/
//对数组键名排序 uksort(array,sorttype)
function cmp($a, $b) //用户自定义回调函数
{
if($a==$b) //如果两个参数相等
{
return 0; //返回0
}
return($a>$b)?-1:1; //如果第1个参数大于第2个返回1，否则-1
}
$a=array(4=>"four",3 =>"three",20 =>"twenty",10=>"ten"); //定义一个数组
uksort ($a,"cmp"); //使用自定义函数对数组键名排序
foreach($a as $key=>$value) //循环输出排序后的键值对
{
echo "$key:$valuen";
}/*
uksort() 函数使用用户自定义的比较函数按照键名对数组排序，并保持索引关系。
如果成功则返回 true，否则返回 false。
如果要排序的数组需要用一种不寻常的标准进行排序，那么应该使用此函数。
自定义函数应接受两个参数，该参数将被数组中的一对键名填充。比较函数在第一个参数小于，等于，或大于第二个参数时必须分别返回一个小于零，等于零，或大于零的整数。
*/
/*
sort() 函数按升序对给定数组的值排序。
注释：本函数为数组中的单元赋予新的键名。原有的键名将被删除。
如果成功则返回 true，否则返回 false。
*/
$fruits=array("lemon","orange","banana","apple"); //定义一个数组
sort($fruits); //对数组进行排序
foreach($fruits as $key=>$val) //循环输出数组排序后的键值对
{
echo "$key=$valn"; //输出键值对
}
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