Shortcode to find and replace URL

Question

I'm trying to create a shortcode that will search within some specified text for a link and replace it with one that I specify. For example:

[scode]Click on <a href="www.X.com">this link</a>[scode] [scode]Click on <a href="www.Y.com">this link</a>[scode] 

...will both be changed to:

[scode]Click on <a href="www.Z.com">this link</a>[scode] 

I'm trying to put together a function that will search for links and replace them with the one that I specify. Here's what I have right now:

// Adds [hide] shortcode for hiding content from non-registered users. function hide_text( $atts,$content) { if ( is_user_logged_in () ) { return $content; } else { $pattern = '(?<=href=("|\'))[^"\']+(?=("|\'))'; $newurl = "http://replacementurl.com"; $content = preg_replace($pattern,$newurl,$content); echo $content; } } add_shortcode( 'hide', 'hide_text' ); 

This just crashes the site, though. I'm not a PHP expert (much less an expert on regex), but are there at least any glaring irregularities in my code?

Or perhaps there's just a better way to go about this and I'm making it way more complicated than it needs to be?

UPDATE:

As suggested, I turned on debug log, which showed me that I had an extra } in the code. Updated code is shown above. Now the site isn't crashing, but the link and text within the shortcode is completely erased, just blank.

Answer 1

Your shortcode function should look like this:

function replace_url_for_nonlogged( $atts, $content = "") { if ( is_user_logged_in () ) return $content; extract( shortcode_atts( array( 'replace' => 'http://www.default_replace_url.com', ), $atts ) ); $pattern = '/href=("|\')((([A-Za-z]{3,9}:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)("|\')/'; return preg_replace($pattern, "href=\"$replace\"", $content); } add_shortcode( 'scode', 'replace_url_for_nonlogged' ); 

Then you can use the shortcode like this:

[scode]Lorem <a href="http://reservedurl.com">ipsum</a> dolor <a href='http://resersinglequoted.com'>simet</a>.[/scode] 

and the output became:

Lorem <a href="http://www.default_replace_url.com">ipsum</a> dolor <a href="http://www.default_replace_url.com">simet</a>. 

the url replaced is setted as default in the replace_url_for_nonlogged function.

If you want you can pass the replacent url via shortcode att, e.g.

[scode replace="http://www.google.com"]Lorem <a href="http://reservedurl.com">ipsum</a> dolor <a href='http://resersinglequoted.com'>simet</a>.[/scode] 

and this time the output became:

Lorem <a href="http://www.google.com">ipsum</a> dolor <a href="http://www.google.com">simet</a>. 

---

Answer 2

Try this:

function timMcLure_hide_text( $atts,$content="") { if (!is_user_logged_in () ) { $pattern = "<a\s[^>]*href=(\"??)([^\" >]*?)\\1[^>]*>(.*)<\/a>"; $newurl = "http://replacementurl.com"; $content = preg_replace($pattern, $newurl, $content); } return $content; } add_shortcode( 'urlhide', 'timMcLure_hide_text' ); 

Then use [urlhide]as a shortcode.

Please try and report as i cannot easily test this.