Remove specific parameters from a URL using PHP

Question

So I'm attempting to remove specific parameters from the URL query string that are predefined in an array. Here's what I have so far:

<?php
// Construct the current page URL
$host     = $_SERVER['HTTP_HOST'];
$script   = $_SERVER['SCRIPT_NAME'];
$params   = $_SERVER['QUERY_STRING'];
$currentUrl = 'http://' . $host . $script . '?' . $params;

// Store all URL parameters into an array (HOST, PATH, QUERY, etc)
$url_params = array();
$url_params = parse_url($currentUrl);

// Create an array to store just the query string, breaking them apart
$params_array = explode('&', $url_params['query']);

// Array holding URL parameters that we want to remove
$params_to_remove = array("param1", "param2", "param3", "param4", "param5");


$location = 0;
// Loop through and remove parameters found in PARAMS_TO_REMOVE array
for($x = 0; $x < count($params_to_remove); $x++) {
    if(in_array($params_to_remove[$x], $params_array)) {
        $location = array_search($params_to_remove[$x], $params_array);
        unset($params_array[$location]);
    }
}

// Print array after unwanted parameters were removed
print_r($params_array);
echo '<br /><br />';

// Construct a new array holding only the parameters that we want
$clean_params_array = array();
for($z = 0; $z < count($params_array); $z++) {
    if($params_array[$z] != '') array_push($clean_params_array, $params_array[$z]);
}

// Print clean array
print_r($clean_params_array);
echo '<br />';

// Construct the new URL
// If there are paramters remaining in URL reconstruct them
if(count($clean_params_array) > 0) {
    $final_url = 'http://www.example.com' . $url_params['path'] . '?';
    for($y = 0; $y < count($clean_params_array); $y++) {
        $final_url .= $clean_params_array[$y] . '&';
    }
    // Trim off the final ampersand
    $final_url = substr($final_url, 0, -1);
}
// No parameters in final URL
else $final_url = 'http://www.example.com' . $url_params['path'];

// Print final URL
echo '<br />' . $final_url;
?>

Here's the output:

Using http://www.example.com/test.php?apple&banana&orange&param1&strawberry&param2&pineapple

Array ( [0] => apple [1] => banana [2] => orange [4] => strawberry [6] => pineapple ) 

Array ( [0] => apple [1] => banana [2] => orange [3] => strawberry ) 

http://www.example.com/test.php?apple&banana&orange&strawberry

As you can see I'm losing the last parameter. I also feel as if I'm being too verbose...where am I going wrong?

Why don't you use http_build_query() for constructing the URL? — ComFreek
– ComFreek, Commented Apr 24, 2012 at 20:12
Therefore I created only a comment, it's just a side note ;) — ComFreek
– ComFreek, Commented Apr 24, 2012 at 20:29

Niet the Dark Absol · Accepted Answer · 2012-04-24 20:16:16Z

3

$new_url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['SCRIPT_NAME']."?".implode("&",array_diff(explode("&",$_SERVER['QUERY_STRING']),Array("param1","param2","param3","param4","param5")));

One-liner ;)

Although you'd probably be better off taking that Array(...) out of there and defining it as a variable beforehand, so it's easier to read.

answered Apr 24, 2012 at 20:16

Niet the Dark Absol

326k86 gold badges480 silver badges604 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

vascowhite Over a year ago

Nice solution, but I hate complicated 1 liners like that. I'd rather have 3/4 lines of easy to follow code. So -1, Sorry.

William Orazi Over a year ago

If only I had seen the array_diff function earlier :(

miro · Accepted Answer · 2012-04-24 20:21:47Z

<?php 
 /** 
  * generateURL() 
  * 
  * Sprava URL adresy 
  * 
  * @author   stenley <[email protected]> 
  * @version   1.4 
  */ 

 function generateURL() { 
    $GET = $_GET; 
    $QUERY_STRING = ''; 
    $SCRIPT_NAME = substr(strrchr($_SERVER["SCRIPT_NAME"],"/"),1); 

    $num_args = func_num_args(); 
    if($num_args>0 && $num_args%2==0) { 
       $args = func_get_args(); 

       foreach($args as $index => $paramName) { 
          $paramName = trim($paramName); 

          if($index%2==0 && !empty($paramName)) { 
             $paramValue = trim($args[$index+1]); 

             if(array_key_exists($paramName, $GET) && empty($paramValue)) { 
                unset($GET[$paramName]);    
             } elseif(!empty($paramValue)) { 
                $GET[$paramName] = $paramValue; 
             } 
          } 
       } 
    } 

    foreach($GET as $param => $value) { 
       $QUERY_STRING .= $param."=".$value."&amp;"; 
    } 

    return $SCRIPT_NAME.((empty($QUERY_STRING)) ? '' : "?".substr($QUERY_STRING,0,-5)); 
 } 
 ?>

here is great function for managing URL address. usage is easy. here are some examples in Slovak language. but I think you will understand code samples. or I will translate it for you

sorry for my english

Terry Seidler · Accepted Answer · 2012-04-24 20:24:13Z

1

Part of the answer is in this line: Array ( [0] => apple [1] => banana [2] => orange [4] => strawberry [6] => pineapple )

Note that $params_array[5] does not exist. Yet you try to read $params_array[5] when $z==5 (In your while loop you go through values $z = 0; => $z < 6; (count($params_array))

You can use Kolink's solution, or use a foreach loop to go through all the values:

foreach($params_array as $param) {
    if($param != '') array_push($clean_params_array, $param); 
}

answered Apr 24, 2012 at 20:24

Terry Seidler

2,04316 silver badges28 bronze badges

Collectives™ on Stack Overflow

Remove specific parameters from a URL using PHP

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related