CODEWITHSUNDEEP
phpregex
njt
njt

Reputation: 277

Dynamically replace the "src" attributes of all <img> tags

I have some HTML and want to replace the "src" attributes of all the img tags so that they point to copies of the identical images (although with different file names) on another host.

So for instance, given these three tags

<IMG SRC="../graphics/pumpkin.gif" ALT="pumpkin">
<IMG BORDER="5" SRC="redball.gif" ALT="*"> 
<img alt="cool image" src="http://www.crunch.com/pic.jpg"/>

I would like them replaced with

<IMG SRC="http://myhost.com/cache/img001.gif" ALT="pumpkin">
<IMG BORDER="5" SRC="http://myhost.com/cache/img002.gif" ALT="*"> 
<img alt="cool image" src="http://myhost.com/cache/img003.jpg"/>

I know there is some regexp magic to this, just not sure what it should look like (or if this is in fact the best way).

Upvotes: 2

Views: 3587

Answers (6)

Andrioid
Andrioid

Reputation: 3390

You can use phpQuery to do this.

foreach (pq("img") as $img) {
  // insert regexp magic here
  $img->attr('src', $newurl);
}

Quite possibly overkill, but it works. Especially for people used to working with jQuery.

Upvotes: 0

Francisc
Francisc

Reputation: 80505

Just run over all images in the document and get/set the src attribute.

var images=document.getElementByTagName('img');
for(var i=0;i<images.length;i++)
{
   images[i].getAttribute("src");//do something with it
   images[i].setAttribute("src",some_new_value);//set new src
}

As many have already said, you don't need RegExp for this.

Upvotes: 0

Bill Karwin
Bill Karwin

Reputation: 562921

I tried doing this with SimpleHTMLDOM, and it seems to work:

$html = str_get_html( ... ); // what you have done

$map = array(
  "../graphics/pumpkin.gif"       => "http://myhost.com/cache/img001.gif",
  "redball.gif"                   => "http://myhost.com/cache/img002.gif",
  "http://www.crunch.com/pic.jpg" => "http://myhost.com/cache/img003.gif",
);

foreach ($html->find("img") as $element) {
  if (isset($map[$element->src])) {
    $element->src = $map[$element->src];
  }
}

echo $html;

PS: If you need to clarify your question, you should edit your original question instead of opening a new, identical question.

Upvotes: 5

mezzie
mezzie

Reputation: 1296

using jquery, you can get all the images as such:

$("img").each(function(
  if($this.attr('src') == "../graphics/pumpkin.gif"){
    $this.attr('src', 'http://myhost.com/cache/img001.gif');
  }else if...
))

Upvotes: 0

Roger Willcocks
Roger Willcocks

Reputation: 1667

You will need case insensitive RegEx matching, and you'll also need to consider " vs ' quotes.

Hhmm. I think I'd use a System.Text.RegularExpressions.RegEx.Replace with delegate call.

You'd need to make sure the quote matched, so you'd need an ORed check. Roughly:

\<IMG .* src\=\'.*?\' | \<IMG .* src\=\".*?\"

Upvotes: 0

Jim Brissom
Jim Brissom

Reputation: 32969

This being asked on SO, you will most likely get a lot of answers telling you to use a parser instead. Guess what, I think it's the right answer. In PHP, you can use DOMDocument's loadHTML method to create a DOM tree from a given HTML document, which you can walk over, modifying the tags as you go along.

Upvotes: 4

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