Question

I know a bit about Regular Expression but really want to learn more about it and now i’m trying to make a function that detects all {} in my content (from a database) and checks what between the brackets. If there is a POST or GET with a name (format: POST:name or GET:name} i would like to replace them with that value.

Example:
When i have a form with the following inputs:

Name
Email
Message

And then in the value attribute i type: {POST:Name}
Then the script must detect the {POST:Name} and will replace it with the string in $_POST['name']. I already searched on Google, but found too much that i don’t know what to really use.

Now i have:

<?php
        preg_match_all("/{(POST|GET):[.*](})/", $content, $matches, PREG_SET_ORDER);

        foreach($matches AS $match)
        {
            if(isset($_POST[$match]))
                $content = str_replace('{POST:'.$match, $_POST[$match], $content);
            else
                $content = str_replace('{GET:'.$match, $_GET[$match], $content);
        }

?>

But this don’t work.

Answer 1

You should use preg_replace, better than str_replace.
And if you use preg_replace, you don’t need no more your first condition, et can do the same code with only one instruction.

https://www.php.net/preg_replace

<?php preg_replace('#{(POST|GET):(.*)}#','$_$1[$2]',$content); ?>

My regex can be false, but something like this should work.