Sorting Array Values in PHP(数组排序)

yipeiwu_com5年前PHP代码库
复制代码 代码如下:

$full_name = array();
$full_name["Roger"] = "Waters";
$full_name["Richard"] = "Wright";
$full_name["Nick"] = "Mason";
$full_name["David"] = "Gilmour";

To sort this array, you just use the assort( ) function. This involves nothing more complex than typing the word asort, followed by round brackets. In between the round brackets, type in the name of your Associative array:
复制代码 代码如下:

asort($full_name);

The letter "a" tells PHP that the array is an Associative one. (If you don't have the "a" before "sort", your key names will turn in to numbers!). The "a" also tells PHP to sort by the Value, and NOT by the key. In our script above, the surnames will be sorted. If you want to sort using the Key, then you can use ksort() instead.

If you have a Scalar array (numbers as Keys), then you leave the "a" off. Like this:
复制代码 代码如下:

$numbers = array( );
$numbers[]="2";
$numbers[]="8";
$numbers[]="10";
$numbers[]="6";
sort($numbers);
print $numbers[0] ;
print $numbers[1];
print $numbers[2] ;
print $numbers[3];

The numbers are then sorted from lowest to highest. If you want to sort in reverse order then you need the following:

rsort( ) – Sorts a Scalar array in reverse order
arsort( ) - Sorts the Values in an Associative array in reverse order
krsort( ) - Sorts the Keys in an Associative array in reverse order

In the next part, we look at how to get a random value from an array.

相关文章

window+nginx+php环境配置 附配置搭配说明

1,下载PHP   php下载版本比较多,其中,   vc9=vs2008编译,推荐使用IIS+php搭配模式,   vc6=vs6编译,推荐使用apache+php方式搭配,   Th...

PHP对象实例化单例方法

PHP实例化对象单例的方法: 三私一公:2个私有方法,1个私有属性,1个公共方法   private function __construct(){} //不可以继承构造方法   p...

Ajax请求PHP后台接口返回信息的实例代码

Ajax请求PHP后台接口返回信息的实例代码

前台就是一个表单,这里是用的bootstrop的 <form method="post" > <!-- token验证 --> <!--{{ csr...

PHP爆绝对路径方法收集整理

1、单引号爆路径 说明: 直接在URL后面加单引号,要求单引号没有被过滤(gpc=off)且服务器默认返回错误信息。 Eg: www.xxx.com/news.php?id=149′ 2...

PHP输出缓存ob系列函数详解

ob的基本原则:如果ob缓存打开,则echo的数据首先放在ob缓存。如果是header信息,直接放在程序缓存。当页面执行到最后,会把ob缓存的数据放到程序缓存,然后依次返回给浏览器。下面...