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# http_build_query

(PHP 5)

http_build_query -- Generate URL-encoded query string

## Description

string http_build_query ( array formdata [, string numeric_prefix])

Generates a URL-encoded query string from the associative (or indexed) array provided. `formdata` may be an array or object containing properties. A `formdata` array may be a simple one-dimensional structure, or an array of arrays (who in turn may contain other arrays). If numeric indices are used in the base array and a `numeric_prefix` is provided, it will be prepended to the numeric index for elements in the base array only. This is to allow for legal variable names when the data is decoded by `PHP` or another CGI application later on.

例 1. 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 ?>`

例 2. http_build_query() with numerically index elements.

`<?php $data = array('foo', 'bar', 'baz', 'boom', 'cow' => 'milk', 'php' =>'hypertext processor'); echo http_build_query($data); /* Outputs: 0=foo&1=bar&2=baz&3=boom&cow=milk&php=hypertext+processor */ echo http_build_query($data, 'myvar_'); /* Outputs: myvar_0=foo&myvar_1=bar&myvar_2=baz&myvar_3=boom&cow=milk&php=hypertext+processor */ ?>`

例 3. 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[name]=Bob+Smith&user[age]=47&user[sex]=M&user[dob]=5%1F12%1F1956&
    pastimes[0]=golf&pastimes[1]=opera&pastimes[2]=poker&pastimes[3]=rap&
    children[bobby][age]=12&children[bobby][sex]=M&children[sally][age]=8&
    children[sally][sex]=F&flags_0=CEO

> 注意: 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.

例 4. 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 ?>`

See also: parse_str(), parse_url(), urlencode(), and array_walk()

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