Question

I would like to implement the following feature onto my site. When a user posts something, he is also allowed to include one link, which is a link to a picture. Imagine a user posts something like this:

Hello look at this awesome picture. It is hilarious isn't it?
http://www.google.com/image.jpg

Then that text should be converted to:

Hello look at this awesome picture. It is hilarious isn't it?
<a target="_blank" href="http://www.google.com/image.jpg">
    <img src="http://www.google.com/image.jpg" alt=""/>
</a> 

So I need some php script that searches through the text for links and if it finds a link, checks that it links to a picture. It also needs to be able to recognize links that do not start with http, and also links that start with https.

How would you do that?

Thanks a lot 🙂

Dennis

Answer 1

how about these two links combined:

best way to determine if a URL is an image in PHP

PHP Regular Expression Text URL to HTML Link

$url="http://google.com/image.jpg";

function isImage( $url ){
  $pos = strrpos( $url, ".");
    if ($pos === false)
      return false;
    $ext = strtolower(trim(substr( $url, $pos)));
    $imgExts = array(".gif", ".jpg", ".jpeg", ".png", ".tiff", ".tif"); // this is far from complete but that's always going to be the case...
    if ( in_array($ext, $imgExts) )
      return true;
return false;
}

$test=isImage($url);
if($test){
  $pattern = '/((?:[\w\d]+\:\/\/)?(?:[\w\-\d]+\.)+[\w\-\d]+(?:\/[\w\-\d]+)*(?:\/|\.[\w\-\d]+)?(?:\?[\w\-\d]+\=[\w\-\d]+\&?)?(?:\#[\w\-\d]*)?)/';
  $replace = '<a href="$1">$1</a>';
  $msg = preg_replace( $pattern , $replace , $msg );
  return stripslashes( utf8_encode( $msg ) );
}