Question

I want to replace

{youtube}Video_ID_Here{/youtube}

with the embed code for a youtube video.

So far I have

preg_replace('/{youtube}(.*){\/youtube}/iU',...)

and it works just fine.

But now I’d like to be able to interpret parameters like height, width, etc. So could I have one regex for this whether is does or doesn’t have parameters? It should be able to inperpret all of these below…

{youtube height="200px" width="150px" color1="#eee" color2="rgba(0,0,0,0.5)"}Video_ID_Here{/youtube}

{youtube height="200px"}Video_ID_Here{/youtube}

{youtube}Video_ID_Here{/youtube}

{youtube width="150px" showborder="1"}Video_ID_Here{/youtube}

Answer 1

Try this:

function createEmbed($videoID, $params)
{
    // $videoID contains the videoID between {youtube}...{/youtube}
    // $params is an array of key value pairs such as height => 200px

    return 'HTML...'; // embed code
}

if (preg_match_all('/\{youtube(.*?)\}(.+?)\{\/youtube\}/', $string, $matches)) {
    foreach ($matches[0] as $index => $youtubeTag) {
        $params = array();

        // break out the attributes
        if (preg_match_all('/\s([a-z0-9]+)="([^\s]+?)"/', $matches[1][$index], $rawParams)) {
            for ($x = 0; $x < count($rawParams[0]); $x++) {
                $params[$rawParams[1][$x]] = $rawParams[2][$x];
            }
        }

        // replace {youtube}...{/youtube} with embed code
        $string = str_replace($youtubeTag, createEmbed($matches[2][$index], $params), $string);
    }
}

this code matches the {youtube}…{/youtube} tags first and then splits out the attributes into an array, passing both them (as key/value pairs) and the video ID to a function. Just fill in the function definition to make it validate the params you want to support and build up the appropriate HTML code.