Parse query string into an array

How can I turn a string below into an array?

pg_id=2&parent_id=2&document&video 

This is the array I am looking for,

array(
    'pg_id' => 2,
    'parent_id' => 2,
    'document' => ,
    'video' =>
)

You want the parse_str function, and you need to set the second parameter to have the data put in an array instead of into individual variables.

$get_string = "pg_id=2&parent_id=2&document&video";
 
parse_str($get_string, $get_array);

print_r($get_array);

Sometimes parse_str() alone is note accurate, it could display for example:

$url = "somepage?id=123&lang=gr&size=300";

parse_str() would return:

Array ( 
    [somepage?id] => 123 
    [lang] => gr 
    [size] => 300 
)

It would be better to combine parse_str() with parse_url() like so:

$url = "somepage?id=123&lang=gr&size=300";
parse_str( parse_url( $url, PHP_URL_QUERY), $array );
print_r( $array );

Using parse_str().

$str = 'pg_id=2&parent_id=2&document&video';
parse_str($str, $arr);
print_r($arr);

Use http://us1.php.net/parse_str

Attention, its usage is:

parse_str($str, &$array);

not

$array = parse_str($str);

Please note that the above only applies to PHP version 5.3 and earlier. Call-time pass-by-reference has been removed in PHP 5.4.

If you're having a problem converting a query string to an array because of encoded ampersands

&

then be sure to use html_entity_decode

Example:

// Input string //
$input = 'pg_id=2&parent_id=2&document&video';

// Parse //
parse_str(html_entity_decode($input), $out);

// Output of $out //
array(
  'pg_id' => 2,
  'parent_id' => 2,
  'document' => ,
  'video' =>
)

There are several possible methods, but for you, there is already a built-in parse_str function:

$array = array();
parse_str($string, $array);
var_dump($array);

This is a one-liner for parsing a query from the current URL into an array:

parse_str($_SERVER['QUERY_STRING'], $query);

You can use the PHP string function parse_str() followed by foreach loop.

$str="pg_id=2&parent_id=2&document&video";
parse_str($str,$my_arr);
foreach($my_arr as $key=>$value){
  echo "$key => $value<br>";
}
print_r($my_arr);

You can try this code:

<?php
    $str = "pg_id=2&parent_id=2&document&video";
    $array = array();
    parse_str($str, $array);
    print_r($array);
?>

Output:

Array
(
    [pg_id] => 2
    [parent_id] => 2
    [document] =>
    [video] =>
)

But PHP already comes with a built in $_GET function. this will convert it to the array by itself.

try print_r($_GET) and you will get the same results.

This is the PHP code to split a query in MySQL and SQL Server:

function splitquery($strquery)
{
    $arrquery = explode('select', $strquery);

    $stry = ''; $strx = '';

    for($i=0; $i<count($arrquery); $i++)
    {
        if($i == 1)
        {
            echo 'select ' . trim($arrquery[$i]);
        }
        elseif($i > 1)
        {
            $strx = trim($arrquery[($i-1)]);

            if(trim(substr($strx,-1)) != '(')
            {
                $stry = $stry . '

                        select ' . trim($arrquery[$i]);
            }
            else
            {
                $stry = $stry.trim('select ' . trim($arrquery[$i]));
            }
            $strx = '';
        }
    }
    return $stry;
}

Example:

Query before

Select xx from xx select xx,(select xx) from xx where y='    cc'
select xx from xx left join (select xx) where (select top 1 xxx from xxx) oder by xxx desc";

Query after

select xx from xx

select xx,(select xx) from xx where y='    cc'

select xx from xx left join (select xx) where (select top 1 xxx from xxx) oder by xxx desc

For this specific question the chosen answer is correct but if there is a redundant parameter—like an extra "e"—in the URL the function will silently fail without an error or exception being thrown:

a=2&b=2&c=5&d=4&e=1&e=2&e=3 

So I prefer using my own parser like so:

//$_SERVER['QUERY_STRING'] = `a=2&b=2&c=5&d=4&e=100&e=200&e=300` 

$url_qry_str  = explode('&', $_SERVER['QUERY_STRING']);

//arrays that will hold the values from the url
$a_arr = $b_arr = $c_arr = $d_arr = $e_arr =  array();

foreach( $url_qry_str as $param )
	{
	  $var =  explode('=', $param, 2);
	  if($var[0]=="a") 		$a_arr[]=$var[1];
	  if($var[0]=="b") 		$b_arr[]=$var[1];
	  if($var[0]=="c") 		$c_arr[]=$var[1];
	  if($var[0]=="d") 		$d_arr[]=$var[1];
	  if($var[0]=="e") 		$e_arr[]=$var[1];
	}
    
    var_dump($e_arr); 
    // will return :
    //array(3) { [0]=> string(1) "100" [1]=> string(1) "200" [2]=> string(1) "300" } 

Now you have all the occurrences of each parameter in its own array, you can always merge them into one array if you want to.

Hope that helps!