php练习04

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2022/4/20/020
 * Time: 15:52
$fruits  = array("lemon","Orange","banana","apple");
sort($fruits );
foreach($fruits as $key=>$val){
echo "fruits[".$key."]=".$val."<br />" ;
}
/*运行结果为:
fruits[0]=Orange
fruits[1]=apple
fruits[2]=banana
fruits[3]=lemon
 */
$fruits  = array("lemon","Orange","banana","apple");
sort($fruits,SORT_NATURAL | SORT_FLAG_CASE );  //不区分大小写自然排序
foreach($fruits as $key=>$val){
    echo "fruits[".$key."]=".$val."<br />" ;
}
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
$fruits  = array("lemon","Orange","banana","apple");
rsort($fruits,SORT_NATURAL | SORT_FLAG_CASE );  //不区分大小写自然排序
foreach($fruits as $key=>$val){
    echo "fruits[".$key."]=".$val."<br />" ;
}
//使用rsort()函数进行数组排序。
$fruits  = array("lemon","Orange","banana","apple");
sort($fruits );
foreach($fruits as $key=>$val){
    echo "fruits[".$key."]=".$val."<br />" ;
}
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
$fruits  = array("lemon","Orange","banana","apple");
rsort($fruits,SORT_NATURAL | SORT_FLAG_CASE );  //不区分大小写自然排序
foreach($fruits as $key=>$val){
    echo "fruits[".$key."]=".$val."<br />" ;
}
//使用ksort()函数和krsort()函数进行数组索引排序。
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
$citylist = array('shoudu'=>'Beijing','sichuan'=>'Chengdu',
    'hubei'=>'Wuhan','zhejiang'=>'Hangzhou');
ksort($citylist);   //按索引排序--升序，不打乱索引和值的对应性
foreach($citylist as $key=>$value){
    echo $key.'----'.$value.'<br />';
}
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
$citylist = array('shoudu'=>'Beijing','sichuan'=>'Chengdu',
    'hubei'=>'Wuhan','zhejiang'=>'Hangzhou');
krsort($citylist);  //按索引排序--降序，不打乱索引和值的对应性
foreach($citylist as $key=>$value){
    echo $key.'----'.$value.'<br />';
}
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";
echo"<br>";