用多个参数重写URL PHP Apache

Question

I just spent a few hours looking around here but didn't really find a solution.

I currently have typical query string like;

 http://www.site/jobs/results.php?keyword=Accounting+%26+Finance&type=10&state_id=130&location=NSW&order=1&page=1

which Id like to rewrite to

 http://www.site/jobs/find/accounting-finance/NSW/free-jobs/1/?order=1

but I don't know what params will sent, that will depend on what the user does, filters,categories,orders etc

I would like to keep it simple and parse the url in PHP and use a simple rewrite rule, but then I need key/value pairs so I know which value belongs to which param something like;

http://www.site/jobs/find/keyword/accounting-finance/state/NSW/type/free-jobs/page/1/?order=1

I'm told that is not a good option for seo.

Apart from writing many different rules in .htacces to cover all the scenarios can you suggest a better way to approach this

Thanks

Answer 1

.htaccess :

RewriteEngine on
# skip rewriting if file/dir exists (optionally)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
# rewrite all to results.php
RewriteRule . results.php

php (simple way with key=>value pairs):

// current URI (/jobs/find/keyword/accounting-finance/state/NSW/type/free-jobs/page/1/?order=1)
$path = $_SERVER['REQUEST_URI'];

// remove base path (/jobs)
if (($len = strlen(basename($_SERVER['SCRIPT_FILENAME'])))) 
    $path = substr($len, $path);

// remove GET params (?order=1)
if (false !== ($pos = strpos($path, '?'))) 
    $path = substr($path, 0, $pos);

$path = explode('/', trim($path, '/'));

// extract action (or whatever 'find' is)
$action = array_shift($path);

// make key => value pairs from the rest
$params = array();
for ($i = 1, $c = count($path) ; $i < $c ; $i += 2) {
    $params[urldecode($path[$i - 1])] = urldecode($params[$i]);
    // or put it to GET (only remember that it will overwrite already existing values)
    //$_GET[urldecode($path[$i - 1])] = urldecode($params[$i]);
}

you can modify this script to achieve values only without keys, but here comes the question - is it possible to determine if value should be one key or another? If params are always on same position and you can only get less or more of them, then its pretty easy:

// skip this step from previous example
//$action = array_shift($path);    

$params = array(
    'action' => null,
    'keyword' => null,
    'state' => null,
    'type' => null,
    'page' => null,
);
$keys = array_keys($params);
for ($i = 0 , $c = min(count($path), count($keys) ; $i < $c ; ++$i) {
    $params[$keys[$i]] = urldecode($path[$i]);
}

But if you don't know which param is on which position then things are going to be more complex. You would need to do some checks on every param and determine which one it is - if all of those values are selected from some known lists of values then it also won't be very difficult, for example:

$params = array(
    'action' => null,
    'keyword' => null,
    'state' => null,
    'type' => null,
    'page' => null,
);
$params['action'] = array_shift($path);
$keys = array_keys($params);
foreach ($path as $value) {
    if (is_numeric($value)) $params['page'] = intVal($value);
    else {
        $key = null;
        // that switch is not very nice - because of hardcode
        // but is much faster than using 'in_array' or something similar
        // anyway it can be done in many many ways
        switch ($value) {
            case 'accounting-finance' :
            case 'keyword2' :
            case 'keyword3' :
                $key = 'keyword';
                break;
            case 'NSW' :
            case 'state2' :
                $key = 'state';
                break;
            case 'type1' :
            case 'type2' :
            case 'type3' :
                $key = 'type';
                break;
            // and so on...
        }
        if ($key === null) throw new Exception('Unknown value!');
        $params[$key] = $value;
    }
}

You can also to try write some really complex regexes in .htaccess, but IMO it is not a place for that - apache should match request with correct endpoint in your application and run it, its not place for extended params logic (if anyway it will go to the same place in your app). Also its much more convenient to keep that logic in app - when you're changing something you can do that in app code without need of changing anything in htaccess or apache config (in productional environment I'm mostly moving .htaccess contents to apache config and turning off .htaccess support - that gives some speedup when apache is not searching for those files, but any change require apache restart).

Answer 2

If all you want to do is push anything SEO-relevant into the URL, your rewriting actually gets very easy: Just don't do any rewriting at all, keep the parameters where they are, just fill up the spot after results.php with your SEO keywords:

http://myurl/jobs/results.php/seo-keywords/gohere/as-you-like-it?keyword=Accounting+%26+Finance&type=10&state_id=130&location=NSW&order=1&page=1

It should not make a difference to PHP because this nonexistant path ends up getting parsed into $_SERVER['PATH_INFO'], but the script execution stays the same.

Problem is now: What is the source of your SEO relevant keywords? :)