A detailed explanation of http_build_query usage

Http_build_query--The request string after generating url-encoded describes string http_build_query (Array formdata [, String Numeric_prefix])

Generates an url-encoded request string using the given array of associations (or subscripts). Parameters can be arrays or objects that contain properties. An array can be a simple one-dimensional structure, or it can be an array of arrays (which in turn can contain other arrays). If a numeric subscript is used in the underlying array and a parameter is given, the value of this parameter will be prefixed with the number subscript element in the underlying array. This is to allow or other CGI programs to obtain a valid variable name when decoding the data later.

Example 1. http_build_query () using the example

<?php
$data = array('foo'=>'bar',
'baz'=>'boom',
'cow'=>'milk',
'php'=>'hypertext processor');
echo http_build_query($data);
/* 输出：
foo=bar&baz=boom&cow=milk&php=hypertext+processor
*/
?>

Example 2. http_build_query () elements using a numeric subscript

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

Example 3. http_build_query () using a complex array

<?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_ ');        /* Output: (Wrapping it 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 Note: Only the number in the underlying array The word subscript element "CEO" only obtains the prefix, other digital subscript elements (such as the elements under pastimes) do not need toA valid variable name plus a prefix. */?> Example 4.    Http_build_query () uses the object <?php class MyClass {var $foo;    var $baz;     function MyClass () {$this->foo = ' bar ';    $this->baz = ' boom '; }} $data = new MyClass (); echo Http_build_query ($data); /* Output: Foo=bar&baz=boom */?>

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