数组排序

上一篇 / 下一篇 2007-04-30 16:46:58 / 个人分类：PHP学习笔记

1.sort():按数组中的字母/数字的大小进行升序排序.
注意:本函数为array中的元素赋予新的键名.这将删除原有的键名而不仅是重新排序.当函数结束时数组元素值将被从最低到最高重新安排.
如果成功返回Ture,失败返回False.
可选的第2个参数sort_flags可以用以下值改变排序的行为.

SORT_REGULAR:正常比较元素(不改变类型)
SORT_NUMERIC:元素被作为数字来比较.
SORT_STRING:元素被作为字符串来比较.
SORT_LOCALE_STRING:根据当前区域(locale)设置把单元当作字符串比较.

2.asort():对数组进排序,数组的索引键值保持和元素的关联.成功返回Tuer,失败返回False.

3.ksort():对数组键名排序,保留键名到数据的关联.本函数主要用于关联数组.成功返回Tuer,失败返回False.

4.rsort():对数组逆向排序(最高到最低).成功返回Tuer,失败返回False.
注意:本函数为 array 中的单元赋予新的键名。这将删除原有的键名而不仅是重新排序。

例:

<?php
 echo "sort排序 ";
 $fruits = array("lemon","orange","banana","apple");
 sort($fruits);
 foreach($fruits as $key => $val)
 {
 echo "fruits[".$key."]=" .$val." ";
 }
 echo "asort排序 ";
 $fruits = array("d"=>"lemon","a"=>"orange","b"=>"banana","c"=>"apple");
 asort($fruits);
 foreach($fruits as $key => $val)
 {
 echo "$key = $val ";
 }
 echo "ksort排序 ";
 $fruits = array("d"=>"lemon","a"=>"orange","b"=>"apple");
 ksort($fruits);
 foreach($fruits as $val)
 {
 echo "$key => $val ";
 }
 echo "rsort排序 ";
 $fruits = array("lemon","orange","banana","apple");
 rsort($fruits);
 foreach($fruits as $val)
 {
 echo "$key => $val ";
 }
 echo "arsort排序 ";
 $fruits = array("d"=>"lemon","a"=>"orange","b"=>"banana","c"=>"apple");
 arsort($fruits);
 foreach($fruits as $val)
 {
 echo "$key => $val ";
 }
 echo "krsort排序 ";
 $fruits = array("d"=>"lemon","a"=>"orange","b"=>"banana","c"=>"apple");
 krsort($fruits);
 foreach($fruits as $val)
 {
 echo "$key => $val ";
 }
?>

输出结果:

sort排序
fruits[0]=apple
fruits[1]=banana
fruits[2]=lemon
fruits[3]=orange

asort排序
c = apple
b = banana
d = lemon
a = orange

ksort排序
a => orange
a => apple
a => lemon

rsort排序
a => orange
a => lemon
a => banana
a => apple

arsort排序
a => orange
a => lemon
a => banana
a => apple

krsort排序
a => lemon
a => apple
a => banana
a => orange

数组排序

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