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    function handleQueryStringParams($url, $newParams = array()) {
        $urlParts = explode('?', $url);
        $path = $urlParts[0];
        $queryString = '';
        if( count($urlParts) > 1 ) {
            unset($urlParts[0]);
            $queryString = implode('?', $urlParts);
        }
        foreach($newParams as $paramName => $paramValue) {
            if($queryString) {

                if(strpos($queryString, $paramName) === 0 || strpos($queryString, '&'.$paramName) === 0 || strpos($queryString, '&'.$paramName)) {
                    $queryString = preg_replace(array('#'.$paramName.'=[^&]*#', '#'.$paramName.'[\s]*$#'), "{$paramName}={$paramValue}", $queryString);
                } else {
                    $queryString .= "&{$paramName}={$paramValue}";
                }
            } else {
                $queryString .= "{$paramName}={$paramValue}";
            }
        }
        $newUrl = $path;
        if($queryString) {
            $newUrl .= '?'.$queryString;
        }
        return $newUrl;
    }

This function will make you able to modify and add the request parameters without duplicates.

Category: PHP