preg_replace_callback: Keep array pattern context?

bretticus

Does anyone know if you can somehow retrieve the context of an array of strings passed for the pattern argument of preg_replace_callback in the callback function?

For example, I have the following code:

if ( !function_exists('link_tracking_nums') ) {
    function link_tracking_nums($html)
    {        

        $newhtml = preg_replace_callback(
            array(
                REGX_TRACK_FEDEX, REGX_TRACK_UPS, REGX_TRACK_USPS
            ),
            create_function(               

                '$matches',
                'return some_func($matches[0]);' //which pattern did I match?
            ),
            $html
        );
       return $newhtml;
    }
}

bradgrafelman

My guess would be no, you'd need to execute the regexp's one-by-one so you know which pattern generated which results.

bretticus

Yeah, I actually gave up on that last night. I just decided to call the function 3 different times. Kinda ugly code but it will work. :bemused:

bretticus

Actually, I settled on this function. Problem is that the globals in the lamba are not getting set. I thought perhaps because I had a function in a function. I moved the $track_urls variable outside the function and still get NULL's from my var_dump expressions. Also, where $key is set in the loop, not sure it's "global."

if ( !function_exists('link_tracking_nums') ) {
    function link_tracking_nums($html)
    {
        $track_patterns = array(
            'REGX_TRACK_FEDEX'=>REGX_TRACK_FEDEX,
            'REGX_TRACK_UPS'=>REGX_TRACK_UPS,
            'REGX_TRACK_USPS'=>REGX_TRACK_USPS
        );

    $track_urls = array(
        'REGX_TRACK_FEDEX'=>URL_TRACK_FEDEX,
        'REGX_TRACK_UPS'=>URL_TRACK_UPS,
        'REGX_TRACK_USPS'=>URL_TRACK_USPS
    );

    $callback = create_function(
        '$matches',           
        'global $key, $track_urls;'.
        'var_dump($key); var_dump($track_urls);'.
        '$url = sprintf($track_urls[$key],$matches[0]);'.
        'return sprintf("<a href=%s>%s</a>", $url, $matches[0]);'
    );

    foreach ($track_patterns as $key => $pattern) {
        $html = preg_replace_callback(
            $pattern, $callback, $html
        );
    }
    return $html;
}
}

Any ideas on getting the $key and $track_urls into my lambda function? I already tried $GLOBALS. Man, I wish I could do this with PHP 5.3 and then I could use a closure with use(). There's probably some refactoring that I could do and go about this differently, but this is possibly the first time that PHP has kind of let me down syntactically. That being said, I know it's not absolutely fair because I'm being way to stubborn on doing this with preg_replace_callback. I have seen examples of people getting globals in a lamda. Seems like I can never make it work. Am I missing something obvious here (besides the fact my code is butt ugly and almost embarrassing?)

Thanks