CODEWITHSUNDEEP
phpregexpreg-replacepreg-match
mus
mus

Reputation: 51

php preg_replace ignore class attribute if not exist

hello I have the following code : 

$content1 = '<img src="image1.png" class="image1"><img src="image2.png"><img src="image3.png" class="image3">';

when I use this code : 

preg_replace('~<img\s*.*?\s*class\s*=\s*"([^"]*)"\s*.*?>~i','<img src="image-replaced" class="$1">', $content1);

this is what I get : 

<img src="image-replaced" class="image1"><img src="image-replaced" class="image3">

as you can see this <img src="image2.png"> got ignored because it doesn't have a class attribute so it didn't get replaced.
now what I want to do is if img tag has class attribute in it then it get replaced if not then replace it and keep class blank like this:

<img src="image2.png" class="">

I appreciate any help from you.

Upvotes: 0

Views: 1242

Answers (2)

hwnd
hwnd

Reputation: 70732

Instead of using regular expression, you may consider using DOM for this.

$doc = new DOMDocument;
@$doc->loadHTML($content1); // load the HTML data

$imgs = $doc->getElementsByTagName('img');

foreach ($imgs as $img) {
  if ($img->hasAttribute('class')) {
      $img->setAttribute('src', 'image-replaced');
  } else {
      ## Otherwise set an empty class if you desire. 
      $img->setAttribute('class', '');
  }
}

If you must use regular expression, I would consider using a callback:

$str = preg_replace_callback('~<img src="([^"]*)"(?: class="([^"]*)")?>~i', 
  function($m) {
    return '<img src="'.(isset($m[2])?'image-replaced':$m[1]).'" class="'.($m[2]?:'').'">';
  }, $str);

eval.in

Upvotes: 4

ArtisticPhoenix
ArtisticPhoenix

Reputation: 21671

Cant you just replace the contents of the src attribute and leave the class and other stuff untouched

 preg_replace('/src=\"[^\"]+\"/', 'src="image-replaced.png"', '<img src="image1.png" class="image1"><img src="image2.png"><img src="image3.png" class="image3">');

https://regex101.com/r/hR9iH0/1

if img tag has class attribute in it then it get replaced if not then replace it and keep class blank like this:

Let me help you all out,

If the image tag has a class replace the src. If the image does not have a class replace the src and leave the class blank,

having class="" and no class be the same thing.

Upvotes: 0

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