better way to replace query string value in a given url

Question

Okay.. so basically, say we have a link:

$url = \"http://www.site.com/index.php?sub=Mawson&state=QLD&cat=4&page=2&sort=z\";

Answer 1

improve Scuzzy 2013 function last pieces for clean url query string.

// merge the query string
// array_filter removes empty query array
    if ($recursive == true) {
        $merged_result = array_filter(array_merge_recursive($original_query_string, $merged_query_string));
    } else {
        $merged_result = array_filter(array_merge($original_query_string, $merged_query_string));
    }

    // Find the original query string in the URL and replace it with the new one
    $new_url = str_replace($url_components['query'], http_build_query($merged_result), $url);

    // If the last query string removed then remove ? from url 
    if(substr($new_url, -1) == '?') {
       return rtrim($new_url,'?');
    }
    return $new_url;

Answer 2

Well, I had same problem, found this question, and, in the end, prefered my own method. Maybe it has flaws, then please tell me what are they. My solution is:

$query=$_GET;
$query['YOUR_NAME']=$YOUR_VAL;
$url=$_SERVER['PHP_SELF']. '?' .  http_build_query($query);

Hope it helps.

Answer 3

function replaceQueryParams($url, $params)
{
    $query = parse_url($url, PHP_URL_QUERY);
    parse_str($query, $oldParams);

    if (empty($oldParams)) {
        return rtrim($url, '?') . '?' . http_build_query($params);
    }

    $params = array_merge($oldParams, $params);

    return preg_replace('#\?.*#', '?' . http_build_query($params), $url);
}

$url examples:

• http://example.com
• http://example.com/
• http://example.com/page
• http://example.com/page?
• http://example.com/page?foo=bar
• http://example.com/page?foo2=bar2
• http://example.com/page?foo=bar&foo2=bar2

$params example:

[
   'foo' => 'not-bar',
]

Note: it doesn't understand URLs with anchors (hashes) like http://example.com/page?foo=bar#section1

Answer 4

How about something like this?

function merge_querystring($url = null,$query = null,$recursive = false)
{
  // $url = 'http://www.google.com.au?q=apple&type=keyword';
  // $query = '?q=banana';
  // if there's a URL missing or no query string, return
  if($url == null)
    return false;
  if($query == null)
    return $url;
  // split the url into it's components
  $url_components = parse_url($url);
  // if we have the query string but no query on the original url
  // just return the URL + query string
  if(empty($url_components['query']))
    return $url.'?'.ltrim($query,'?');
  // turn the url's query string into an array
  parse_str($url_components['query'],$original_query_string);
  // turn the query string into an array
  parse_str(parse_url($query,PHP_URL_QUERY),$merged_query_string);
  // merge the query string
  if($recursive == true)
    $merged_result = array_merge_recursive($original_query_string,$merged_query_string);
  else
    $merged_result = array_merge($original_query_string,$merged_query_string);
  // Find the original query string in the URL and replace it with the new one
  return str_replace($url_components['query'],http_build_query($merged_result),$url);
}

usage...

<a href="<?=merge_querystring($url,'?page=1');?>">Page 1</a>
<a href="<?=merge_querystring($url,'?page=2');?>">Page 2</a>

Answer 5

If I'm reading this correctly, and I may not be. You know which GET you are replacing in a url string? This may be sloppy but...

$url_pieces = explode( '?', $url );
$var_string = $url_pieces[1].'&';
$new_url = $url_pieces[0].preg_replace( '/varName\=value/', 'newVarName=newValue', $var_string );

That's my take, Good luck.

Answer 6

I don't know if this is what you're trying to accomplish but here it goes anyway:

<?php
    function mergeMe($url, $assign) {
        list($var,$val) = explode("=",$assign);
        //there's no var defined
        if(!strpos($url,"?")) {
            $res = "$url?$assign";
        } else {
            list($base,$vars) = explode("?",$url);
            //if the vars dont include the one given
            if(!strpos($vars,$var)) {
                $res = "$url&$assign";
            } else {
                $res = preg_replace("/$var=[a-zA-Z0-9_]*(&|$)/",$assign."&",$url);
                $res = preg_replace("/&$/","",$res); //remove possible & at the end
            }
        }
        //just to show the difference, should be "return $res;" instead
        return "$url <strong>($assign)</strong><br>$res<hr>";
    }

    //example
    $url1 = "http://example.com";
    $url2 = "http://example.com?sort=a";
    $url3 = "http://example.com?sort=a&page=0";
    $url4 = "http://example.com?sort=a&page=0&more=no";

    echo mergeMe($url1,"page=4");
    echo mergeMe($url2,"page=4");
    echo mergeMe($url3,"page=4");
    echo mergeMe($url4,"page=4");
?>