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Homephp教程php手册PHP函数http_build_query使用详解

这篇文章主要介绍了PHP函数http_build_query使用详解,分别对传入一维关联数组、一维索引数组、二维数组、传入对象等给出示例,需要的朋友可以参考下

什么是http_build_query?

使用给出的关联(或下标)数组生成一个经过 URL-encode 的请求字符串。参数 formdata 可以是数组或包含属性的对象。一个 formdata 数组可以是简单的一维结构,,也可以是由数组组成的数组(其依次可以包含其它数组)。如果在基础数组中使用了数字下标同时给出了 numeric_prefix 参数,此参数值将会作为基础数组中的数字下标元素的前缀。这是为了让 PHP 或其它 CGI 程序在稍后对数据进行解码时获取合法的变量名
http_build_query有多种用法,不仅可以传入关联数组,同时也可以传入索引数组,甚至多维数组以及对象。

http_build_query怎么使用?

复制代码 代码如下:


string http_build_query ( array $formdata [, string $numeric_prefix ] )

传入一维关联数组

复制代码 代码如下:


Array
(
    [name] => lizhong
    [age] => 18
)
name=lizhong&age=18

传入一维索引数组

复制代码 代码如下:


Array
(
    [0] => lizhong
    [1] => 18
)
0=lizhong&1=18


传入二维数组

复制代码 代码如下:


Array
(
    [a] => Array
        (
            [a] => a
            [b] => b
        )

    [c] => c
)

a%5Ba%5D=a&a%5Bb%5D=b&c=c


传入对象

复制代码 代码如下:


class Obj{
    public $a = 'a';
    public $b = 'b';
    private $c = 'c';
    public function func(){
        return;
    }
}
 
 
$obj = new Obj();
 
$str = http_build_query($obj);
 
echo $str;


输出:

复制代码 代码如下:


a=a&b=b


因为$c为私有变量,所以访问不到$c成员,于是只有a与b被输出。而对象里的function也不会被打印出来!
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