string http_build_query ( array $formdata [, string $numeric_prefix ] )
传入一维关联数组
Array
(
[name] => lizhong
[age] => 18
)
name=lizhong&age=18
传入一维索引数组
Array
(
[0] => lizhong
[1] => 18
)
0=lizhong&1=18
传入二维数组
Array
(
[a] => Array
(
[a] => a
[b] => b
)
[c] => c
)
a%5Ba%5D=a&a%5Bb%5D=b&c=c
传入对象
class Obj{
public $a = 'a';
public $b = 'b';
private $c = 'c';
public function func(){
return;
}
}
$obj = new Obj();
$str = http_build_query($obj);
echo $str;
输出：
a=a&b=b
因为$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！