从HTML中抓取唯一的图片网址

Question

Using PHP to curl a web page (some URL entered by user, let's assume it's valid). Example: http://www.youtube.com/watch?v=Hovbx6rvBaA

I need to parse the HTML and extract all de-duplicated URL's that seem like an image. Not just the ones in img src="" but any URL ending in jpe?g|bmp|gif|png, etc. on that page. (In other words, I don't wanna parse the DOM but wanna use RegEx).

I plan to then curl the URLs for their width and height information and ensure that they are indeed images, so don't worry about security related stuff.

Answer 1

Collect all image urls into an array, then use array_unique() to remove duplicates.

$my_image_links = array_unique( $my_image_links );
// No more duplicates

If you really want to do this w/ a regex, then we can assume each image name will be surrounded by either ', ", or spaces, tabs, or line breaks or beginning of line, >, <, and whatever else you can think of. So, then we can do:

$pattern = '/[\'" >\t^]([^\'" 
\t]+\.(jpe?g|bmp|gif|png))[\'" <
\t]/i';
preg_match_all($pattern, html_entity_decode($resultFromCurl), $matches);
$imgs = array_unique($matches[1]);

The above will capture the image link in stuff like:

<p>Hai guys look at this ==> http://blah.com/lolcats.JPEG</p>

Live example