supertrue supertrue - 2 months ago 9x
PHP Question

How to create a Wordpress shortcode-style function in PHP

I am trying to create a Wordpress shortcode-style feature in PHP to replace shortcodes like "[[133]]" with images. Basically, I have a MySQL table of image URLs/titles/subtitles with IDs 1-150, and I want to be able to dynamically insert them into the text of my pages with shortcodes like this:

Blabla bla bla bla bla. [[5]] Also, bla bla bla bla bla [[27]]
Hey, and bla bla bla! [[129]]

So, I just want to grab the ID as $id, and then feed it to a MySQL query like
mysql_query("SELECT title,subtitle,url FROM images WHERE id = $id")
and then replace the "[[id]]" with the img/title/subtitle. I would like to be able to do this multiple times on the same page.

I know this has to involve regex and some combination of preg_match, preg_replace, strstr, strpos, substr... but I don't know where to start and which functions I should be using to do which things. Can you recommend a strategy? I don't need the code itself—just knowing what to use for which parts would be extremely helpful.


With a function getimage($id) that does the MySQL query and formats the replacement text, this almost does everything you need:

$text = "Blabla [[5]] and [[111]] bla bla bla [[27]] and bla bla bla! [[129]]";

$zpreg = preg_match_all('#\[\[(\d{1,3})\]\]#', $text, $matches );

var_dump( $matches[1] );  

$newtext = preg_replace('#\[\[(\d{1,3})\]\]#', getimage($matches[1][?????]), $text);

echo $newtext;

I just need to figure out what to put inside getimage() (where ????? is) that will make it put in the right image for the right [[id]].

Refer preg_match_all and preg_replace on official documentation for more details.