This is my interpretation, I come from a WordPress background and tried to recreate the setup for a custom php project.
It'll handle things like [PHONE] [PHONE abc="123"] etc
The only thing it falls flat on is the WordPress style [HERE] to [HERE]
Function to build a list of available shortcodes
// Setup the default global variable
function create_shortcode($tag, $function)
{
global $shortcodes;
$shortcodes[$tag] = $function;
}
define shortcodes individually, e.g. [IFRAME url="https://www.bbc.co.uk"]:
/**
* iframe, allows the user to add an iframe to a page with responsive div wrapper
*/
create_shortcode('IFRAME', function($atts) {
// ... some validation goes here
// The parameters that can be set in the shortcode
if (empty($atts['url'])) {
return false;
}
return '
<div class="embed-responsive embed-responsive-4by3">
<iframe class="embed-responsive-item" src="' . $atts['url'] . '">
</iframe>
</div>';
});
Then when you want to pass a block of html via the shortcode handling do... handle_shortcodes($some_html_with_shortcodes);
function handle_shortcodes($content)
{
global $shortcodes;
// Loop through all shortcodes
foreach($shortcodes as $key => $function){
$matches = [];
// Look for shortcodes, returns an array of ALL matches
preg_match_all("/\[$key([^_^\]].+?)?\]/", $content, $matches, PREG_UNMATCHED_AS_NULL);
if (!empty($matches))
{
$i = 0;
$full_shortcode = $matches[0];
$attributes = $matches[1];
if (!empty($attributes))
{
foreach($attributes as $attribute_string) {
// Decode the values (e.g. " to ")
$attribute_string = htmlspecialchars_decode($attribute_string);
// Find all the query args, looking for `arg="anything"`
preg_match_all('/\w+\=\"(.[^"]+)\"/', $attribute_string, $query_args);
$params = [];
foreach ($query_args[0] as $d) {
// Split the
list($att, $val) = explode('=', $d, 2);
$params[$att] = trim($val, '"');
}
$content = str_replace($full_shortcode[$i], $function($params), $content);
$i++;
}
}
}
}
return $content;
}
I've plucked these examples from working code so hopefully it's readable and doesn't have any extra functions exclusive to our setup.
[]then below regexes would all fail. Show what you have tried, I may help you. – Dustidustie