PHP 5.4.33 Released

http_build_query

(PHP 5)

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

query_data

可以是数组或包含属性的对象。

一个 query_data 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 query_data 是一个对象,只有 public 的属性会加入结果。

numeric_prefix

如果在基础数组中使用了数字下标同时给出了该参数,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。

arg_separator

除非指定并使用了这个参数,否则会用 arg_separator.output 来分隔参数。

enc_type

默认使用 PHP_QUERY_RFC1738

如果 enc_typePHP_QUERY_RFC1738,则编码将会以 » RFC 1738 标准和 application/x-www-form-urlencoded 媒体类型进行编码,空格会被编码成加号(+)。

如果 enc_typePHP_QUERY_RFC3986,将根据 » RFC 3986 编码,空格会被百分号编码(%20)。

返回值

返回一个 URL 编码后的字符串。

更新日志

版本 说明
5.4.0 加入了 enc_type 参数。
5.1.3 方括号也会被转义。
5.1.2 加入了参数 arg_separator

范例

Example #1 http_build_query() 使用示例

<?php
$data 
= array('foo'=>'bar',
              
'baz'=>'boom',
              
'cow'=>'milk',
              
'php'=>'hypertext processor');

echo 
http_build_query($data) . "\n";
echo 
http_build_query($data'''&amp;');

?>

以上例程会输出:

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

Example #2 http_build_query() 使用数字下标的元素

<?php
$data 
= array('foo''bar''baz''boom''cow' => 'milk''php' =>'hypertext processor');

echo 
http_build_query($data) . "\n";
echo 
http_build_query($data'myvar_');
?>

以上例程会输出:

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

Example #3 http_build_query() 使用复杂的数组

<?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_');
?>

这会输出:(为了可读性,字已经换行了)

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

Note:

只有基础数组中的数字下标元素“CEO”才获取了前缀,其它数字下标元素(如 pastimes 下的元素)则不需要为了合法的变量名而加上前缀。

Example #4 http_build_query() 使用对象

<?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);
?>

以上例程会输出:

pub=publicParent&pub_bar%5Bpub%5D=publicChild

参见

add a note add a note

User Contributed Notes 12 notes

up
22
Ilya Rudenko
8 years ago
Params with null value do not present in result string.

<?
$arr = array('test' => null, 'test2' => 1);
echo http_build_query($arr);
?>

will produce:

test2=1
up
8
eric dot muyser at gmail dot com
1 year ago
This function makes like this

files[0]=1&files[1]=2&...

To do it like this:

files[]=1&files[]=2&...

Do this:

        $query = http_build_query($query);
        $query = preg_replace('/%5B[0-9]+%5D/simU', '%5B%5D', $query);
up
3
Vitaly Dyatlov
1 year ago
Correct implementation of coding the array of params without indexes (valdikks fixed code - didnt work for inner arrays):

<code>
function cr_post($a,$b='',$c=0)
        {
            if (!is_array($a)) return false;
            foreach ((array)$a as $k=>$v)
            {
                if ($c)
                {
                    if( is_numeric($k) )
                        $k=$b."[]";
                    else
                        $k=$b."[$k]";
                }
                else
                {   if (is_int($k))
                        $k=$b.$k;
                }

                if (is_array($v)||is_object($v))
                {
                    $r[]=cr_post($v,$k,1);
                        continue;
                }
                $r[]=urlencode($k)."=".urlencode($v);
            }
            return implode("&",$r);
        }
</code>
up
3
netrox at aol dot com
5 years ago
I noticed that even with the magic quotes disabled, http_build_query() automagically adds slashes to strings.

So, I had to add "stripslashes" to every string variable.
up
4
irish [-@-] ytdj [-dot-] ca
4 years ago
When using the http_build_query function to create a URL query from an array for use in something like curl_setopt($ch, CURLOPT_POSTFIELDS, $post_url), be careful about the url encoding.

In my case, I simply wanted to pass on the received $_POST data to a CURL's POST data, which requires it to be in the URL format.  If something like a space [ ] goes into the http_build_query, it comes out as a +. If you're then sending this off for POST again, you won't get the expected result.  This is good for GET but not POST.

Instead you can make your own simple function if you simply want to pass along the data:

<?php
$post_url
= '';
foreach (
$_POST AS $key=>$value)
   
$post_url .= $key.'='.$value.'&';
$post_url = rtrim($post_url, '&');
?>

You can then use this to pass along POST data in CURL.

<?php
    $ch
= curl_init($some_url);
   
curl_setopt($ch, CURLOPT_POST, true);
   
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_url);
   
curl_exec($ch);
?>

Note that at the final page that processes the POST data, you should be properly filtering/escaping it.
up
5
anonymous
2 years ago
Is it worth noting that if query_data is an associative array and a value is itself an empty array, or an array of nothing but empty array (or arrays containing only empty arrays etc.), the corresponding key will not appear in the resulting query string?
E.g.

$post_data = array('name'=>'miller', 'address'=>array('address_lines'=>array()), 'age'=>23);
echo http_build_query($post_data);

will print
name=miller&age=23
up
2
v0idnull[try_to_spam_me_now] at gee-mail dot co
4 years ago
on my install of PHP 5.3, http_build_query() seems to use &amp; as the default separator. Kind of interesting when combined with stream_context_create() for a POST request, and getting $_POST['amp;fieldName'] on the receiving end.
up
4
Anonymous
3 years ago
As noted before, with php5.3 the separator is &amp; on some servers it seems. Normally if posting to another php5.3 machine this will not be a problem.

But if you post to a tomcat java server or something else the &amp; might not be handled properly.

To overcome this specify:

http_build_query($array, '', '&');

and NOT

http_build_query($array); //gives &amp; to some servers
up
3
valdikss at gmail dot com
7 years ago
This function is wrong for http!
arrays in http is like this:

files[]=1&files[]=2&...

but function makes like this

files[0]=1&files[1]=2&...

Here is normal function:

<?php
function cr_post($a,$b=\'\',$c=0){
if (!is_array($a)) return false;
foreach ((array)$a as $k=>$v){
if ($c) $k=$b.\"[]\"; elseif (is_int($k)) $k=$b.$k;
if (is_array($v)||is_object($v)) {$r[]=cr_post($v,$k,1);continue;}
$r[]=urlencode($k).\"=\".urlencode($v);}return implode(\"&\",$r);}
?>
up
1
stocki dot r at gmail dot com
1 year ago
If you need only key+value pairs, you can use this:

<?php
    $array
= array(
       
"type" => "welcome",
       
"message" => "Hello World!"
   
);
    echo
urldecode(http_build_query($array, '', ';'));
?>

Result: type=welcome;message=Hello World!
up
0
Kirils Solovjovs
1 year ago
instead of some other suggestions that did not work for me, I found that the best way to build POST content (e.g. for stream_context_create) is urldecode(http_build_query($query))
up
-9
jakub dot lopuszanski at nasza-klasa dot pl
9 months ago
While this is not documented, this http_build_query can return FALSE on some inputs:
<?php
 
//gives bool(false)
 
var_dump(http_build_query('whatever'));
?>
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