http_build_query — 生成 URL-encode 之后的请求字符串
说明
string http_build_query ( mixed $query_data [, string $numeric_prefix [, string $arg_separator [, int $enc_type = PHP_QUERY_RFC1738 ]]] )
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.
参数说明：
query_data
可以是数组或是包含属性的对象, 若query_data是一个数组, 它可能是一维数组, 也可以是包含其它数组的数组.
若query_data是一个对象, 则只有公有的属生才能被合成到结果中.
numeric_prefix
若query_data是一个下标数组, 并且这个参数被提供, 则它将作为数字下标的前缀.
This is meant to allow for legal variable names when the data is decoded by PHP or another CGI application later on.
arg_separator
若此参数没有被提供, 默认情况下, arg_separator.output被提供为分隔参数.
enc_type
这个参数默认值是PHP_QUERY_RFC1738.
If enc_type is PHP_QUERY_RFC1738, then encoding is performed per » RFC 1738 and the application/x-www-form-urlencoded media type, which implies that spaces are encoded as plus (+) signs.
若enc_type为PHP_QUERY_RFC1738, 空格将被编码为 + ;
If enc_type is PHP_QUERY_RFC3986, then encoding is performed according to » RFC 3986, and spaces will be percent encoded (%20).
若enc_type为PHP_QUERY_RFC1738, 空格将被编码为 %20 ;
返回值
生成 URL-encode 之后的请求字符串
官方Demo
1)基本用法
<?php
$data = array('foo'=>'bar',
'baz'=>'boom',
'cow'=>'milk',
'php'=>'hypertext processor');
echo http_build_query($data) . "\n";
echo http_build_query($data, '', '&');
?>
输出为
foo=bar&baz=boom&cow=milk&php=hypertext+processor
foo=bar&baz=boom&cow=milk&php=hypertext+processor
2)http_build_query()处理带数字下标的数组
<?php
$data = array('foo', 'bar', 'baz', 'boom', 'cow' => 'milk', 'php' =>'hypertext processor');
echo http_build_query($data) . "\n";
echo http_build_query($data, 'myvar_');
?>
输出为
0=foo&1=bar&2=baz&3=boom&cow=milk&php=hypertext+processor
myvar_0=foo&myvar_1=bar&myvar_2=baz&myvar_3=boom&cow=milk&php=hypertext+processor
3)http_build_query()处理多维数组
<?php
$data = array('user'=>array('name'=>'Bob Smith',
'age'=>47,
'sex'=>'M',
'dob'=>'5/12/1956'),
'pastimes'=>array('golf', 'opera', 'poker', 'rap'),
'children'=>array('bobby'=>array('age'=>12,
'sex'=>'M'),
'sally'=>array('age'=>8,
'sex'=>'F')),
'CEO');
echo http_build_query($data, 'flags_');
?>
输出为：
user%5Bname%5D=Bob+Smith&user%5Bage%5D=47&user%5Bsex%5D=M&
user%5Bdob%5D=5%2F12%2F1956&pastimes%5B0%5D=golf&pastimes%5B1%5D=opera&
pastimes%5B2%5D=poker&pastimes%5B3%5D=rap&children%5Bbobby%5D%5Bage%5D=12&
children%5Bbobby%5D%5Bsex%5D=M&children%5Bsally%5D%5Bage%5D=8&
children%5Bsally%5D%5Bsex%5D=F&flags_0=CEO
4)http_build_query()处理对象
<?php
class parentClass {
public $pub = 'publicParent';
protected $prot = 'protectedParent';
private $priv = 'privateParent';
public $pub_bar = Null;
protected $prot_bar = Null;
private $priv_bar = Null;
public function __construct(){
$this->pub_bar = new childClass();
$this->prot_bar = new childClass();
$this->priv_bar = new childClass();
}
}
class childClass {
public $pub = 'publicChild';
protected $prot = 'protectedChild';
private $priv = 'privateChild';
}
$parent = new parentClass();
echo http_build_query($parent);
?>
输出为
pub=publicParent&pub_bar%5Bpub%5D=publicChild