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http_build_query

Generate URL-encoded query string (PHP 5, PECL pecl_http:0.1.0-0.9.0)
string http_build_query ( array formdata [, string numeric_prefix [, string arg_separator]] )

Generates a URL-encoded query string from the associative (or indexed) array provided.

Parameters

formdata

May be an array or object containing properties.

The array form may be a simple one-dimensional structure, or an array of arrays (who in turn may contain other arrays).

numeric_prefix

If numeric indices are used in the base array and this parameter is provided, it will be prepended to the numeric index for elements in the base array only.

This is meant to allow for legal variable names when the data is decoded by PHP or another CGI application later on.

arg_separator

arg_separator.output is used to separate arguments, unless this parameter is specified, and is then used.

Return Values

Returns a URL-encoded string.

ChangeLog

VersionDescription
5.1.2 The arg_separator parameter was added.
5.1.3 Square brackets are escaped.

Examples

Example 2568. Simple usage of http_build_query()

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

echo
http_build_query($data); // foo=bar&baz=boom&cow=milk&php=hypertext+processor
echo http_build_query($data, '', '&amp;'); // foo=bar&amp;baz=boom&amp;cow=milk&amp;php=hypertext+processor

?>


Example 2569. http_build_query() with numerically index elements.

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

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

The above example will output:

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 2570. http_build_query() with complex arrays

<?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_');
?>

this will output : (word wrapped for readability)

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:

Only the numerically indexed element in the base array "CEO" received a prefix. The other numeric indices, found under pastimes, do not require a string prefix to be legal variable names.


Example 2571. Using http_build_query() with an object

<?php
class myClass {
   var
$foo;
   var
$baz;

   function
myClass() {
       
$this->foo = 'bar';
       
$this->baz = 'boom';
   }
}

$data = new myClass();

echo
http_build_query($data); // foo=bar&baz=boom

?>