Detailed explanation of the usage of http_build_query

http_build_query -- Generate the request string description string after url-encoded http_build_query (array formdata [, string numeric_prefix] )

Use to The associated (or subscripted) array generates a url-encoded request string. Parameters can be arrays or objects containing 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 numeric subscripts are used in the underlying array and the parameter is given, this parameter value will be used as the prefix of the numeric subscript elements in the underlying array. This is to allow or other The CGI program obtains legal variable names when it later decodes the data.

Example 1. http_build_query() Usage example

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

Example 2. http_build_query() Using numerical subscript elements

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

Example 3. http_build_query( ) Using complex arrays

<?php 
$data = array(&#39;user&#39;=>array(&#39;name&#39;=>&#39;Bob Smith&#39;, 
                            &#39;age&#39;=>47, 
                            &#39;sex&#39;=>&#39;M&#39;, 
                            &#39;dob&#39;=>&#39;5/12/1956&#39;), 
              &#39;pastimes&#39;=>array(&#39;golf&#39;, &#39;opera&#39;, &#39;poker&#39;, &#39;rap&#39;), 
              &#39;children&#39;=>array(&#39;bobby&#39;=>array(&#39;age&#39;=>12, 
                                               &#39;sex&#39;=>&#39;M&#39;), 
                                &#39;sally&#39;=>array(&#39;age&#39;=>8, 
                                               &#39;sex&#39;=>&#39;F&#39;)), 
              &#39;CEO&#39;); 
echo http_build_query($data, &#39;flags_&#39;); 
/* 输出：（为了可读性对其进行了折行） 
       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：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。 
*/ 
?>
例子 4. http_build_query() 使用对象
<?php 
class myClass { 
   var $foo; 
   var $baz; 
   function myClass() { 
    $this->foo = &#39;bar&#39;; 
    $this->baz = &#39;boom&#39;; 
   } 
} 
$data = new myClass(); 
echo http_build_query($data); 
/* 输出： 
       foo=bar&baz=boom 
*/ 
?>

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