http_build_query – Generate URL-encoded query string Best Examples [PHP Version (5.0 to 7.4)]

http_build_query() function is an inbuilt function in PHP. Also It is used to generate dynamic URL-encoded query string from the main associative (or indexed) array in PHP.

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

http_build_query syntax Description, Parameters, Return Values and Examples

syntax

string http_build_query ( mixed $query_data [, string $numeric_prefix [, string $arg_separator [, int $enc_type = PHP_QUERY_RFC1738 ]]] )

Here you can Learn to Generate URL-encoded query string Description, Parameters, Return Values and Examples.

Return Values:

It is a Data Returns a URL-encoded string.

php http_build_query Examples

Example #1 Simple usage

<?php
$content = array('fname'=>'xname',
              'lanme'=>'w3diy',
              'cname'=>'infinity',
              'php'=>'programming language');

echo http_build_query($content) . "\n";
echo http_build_query($content, '', '&');

?>

The above example will results:

fname=xname&lanme=w3diy&cname=infinity&php=programming+language
fname=xname&lanme=w3diy&cname=infinity&php=programming+language

Example #2 numerically index elements.

<?php
$content = array('fname', 'xname', 'lanme', 'w3diy', 'cname' => 'infinity', 'php' =>'programming language');

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

The above example will results:

0=fname&1=xname&2=lanme&3=w3diy&cname=infinity&php=programming+language
myvar_0=fname&myvar_1=xname&myvar_2=lanme&myvar_3=w3diy&cname=infinity&php=programming+language

Example #3 complex arrays

<?php
$content = array('member'=>array('name'=>'Modi saha',
                            'age'=>47,
                            'gender'=>'M',
                            'dob'=>'5/12/1992'),
              'hobby'=>array('play', 'dance', 'cricket', 'dev'),
              'submasterren'=>array('Modiby'=>array('age'=>12,
                                               'gender'=>'M'),
                                'sally'=>array('age'=>8,
                                               'gender'=>'F')),
              'HOD');

echo http_build_query($content, 'temps_');
?>

this will results : (word wrapped for readability)

member%5Bname%5D=Modi+saha&member%5Bage%5D=47&member%5Bgender%5D=M&
member%5Bdob%5D=5%2F12%2F1992&hobby%5B0%5D=play&hobby%5B1%5D=dance&
hobby%5B2%5D=cricket&hobby%5B3%5D=dev&submasterren%5BModiby%5D%5Bage%5D=12&
submasterren%5BModiby%5D%5Bgender%5D=M&submasterren%5Bsally%5D%5Bage%5D=8&
submasterren%5Bsally%5D%5Bgender%5D=F&temps_0=HOD

Note:

Only the support numerically indexed data element in the base array “HOD” received a prefix. as well as The other numeric indices, search under hobby, do not need a data content string prefix to be legal way to applay variable names.

Example #4 Using an object

<?php
class masterClass {
    public    $pub      = 'publicmaster';
    protected $prot     = 'protectedmaster';
    private   $priv     = 'privatemaster';
    public    $pub_xname  = Null;
    protected $prot_xname = Null;
    private   $priv_xname = Null;

    public function __construct(){
        $this->pub_xname  = new submasterClass();
        $this->prot_xname = new submasterClass();
        $this->priv_xname = new submasterClass();
    }
}

class submasterClass {
    public    $pub  = 'publicsubmaster';
    protected $prot = 'protectedsubmaster';
    private   $priv = 'privatesubmaster';
}

$master = new masterClass();

echo http_build_query($master);
?>

The above example will results:

pub=publicmaster&pub_xname%5Bpub%5D=publicsubmaster

how to use http build query?

Answer:Build GET/POST Query based on associated array.

how to pass parameter in url in php?

here simply Pass simple array Example

<?php
$vars = array('page' => 45, 'search' => 'authorization');
$qs = http_build_query($vars);
$url = 'http://www.domaine-name.com/search.php?' . $qs;
echo $url;
?>

The above code returns this url query string –

http://www.domaine-name.com/search.php?page=48&search=authorization

how to pass value through url in php?

here Passing variables with data between pages using URL
In your app.php your echo statement must be like this:

echo '<a href="pass.php?link=' . $a . '>Home 1</a>';
echo '<a href="pass.php?link=' . $b . '">Cpntact 2</a>';

Passing data outside

<a href=https://www.domaine-name.com/index.php?id=2489&user=tom>Link to another site</a>

Difference between GET and POST

I hope you get an idea about Generate URL-encoded query string.
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