http_build_query — 生成 URL-encode 之后的请求字符串(http_build_query最新中文翻译)

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, '', '&amp;');


?> 


输出为
foo=bar&baz=boom&cow=milk&php=hypertext+processor
foo=bar&amp;baz=boom&amp;cow=milk&amp;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