Adding a query string to a random URL

问题

I want to add a query string to a URL, however, the URL format is unpredictable. The URL can be

http://example.com/page/ -> http://example.com/page/?myquery=string
http://example.com/page -> http://example.com/page?myquery=string
http://example.com?p=page -> http://example.com?p=page&myquery=string

These are the URLs I'm thinking of, but it's possible that there are other formats that I'm not aware of.

I'm wondering if there is a standard, library or a common way to do this. I'm using PHP.

Edit: I'm using Cbroe explanation and Passerby code. There is another function by Hamza but I guess it'd be better to use PHP functions and also have cleaner/shorter code.

回答1:

function addQuery($url,array $query)
{
    $cache=parse_url($url,PHP_URL_QUERY);
    if(empty($cache)) return $url."?".http_build_query($query);
    else return $url."&".http_build_query($query);
}

// test
$test=array("http://example.com/page/","http://example.com/page","http://example.com/?p=page");
print_r(array_map(function($v){
    return addQuery($v,array("myquery"=>"string"));
},$test));

Live demo

回答2:

I'm wondering if there is a standard, library or a common way to do this. I'm using PHP.

Depends on how failsafe – and thereby more complex – you want it to be.

The simplest way would be to look for whether there’s a ? in the URL – if so, append &myquery=string, else append ?myquery=string. This should cover most cases of standards-compliant URLs just fine.

If you want it more complex, you could take the URL apart using parse_url and then parse_str, then add the key myquery with value string to the array the second function returns – and then put it all back together again, using http_build_query for the new query string part.

回答3:

Some spaghetti Code:

echo addToUrl('http://example.com/page/','myquery', 'string').'<br>';
echo addToUrl('http://example.com/page','myquery', 'string').'<br>';
echo addToUrl('http://example.com/page/wut/?aaa=2','myquery', 'string').'<br>';
echo addToUrl('http://example.com?p=page','myquery', 'string');

function addToUrl($url, $var, $val){
    $array = parse_url($url);
    if(isset($array['query'])){
        parse_str($array['query'], $values);
    }
    $values[$var] = $val;
    unset($array['query']);

    $options = '';$c = count($values) - 1;
    $i=0;
    foreach($values as $k => $v){
        if($i == $c){
            $options .= $k.'='.$v;
        }else{
            $options .= $k.'='.$v.'&';
        }
        $i++;
    }

    $return = $array['scheme'].'://'.$array['host'].(isset($array['path']) ? $array['path']: '') . '?' . $options;
    return $return;
}

Results:

http://example.com/page/?myquery=string
http://example.com/page?myquery=string
http://example.com/page/wut/?aaa=2&myquery=string
http://example.com?p=page&myquery=string

回答4:

You should try the http_build_query() function, I think that's what you're looking for, and maybe a bit of parse_str(), too.

来源：https://stackoverflow.com/questions/16013703/adding-a-query-string-to-a-random-url

标签

php

query-string