Change the URL of an image from wp_get_attachment_image_src

2 comments

1. No, not strictly. You can check the source and see that there is no hook that would let you alter the URL.

   You should also notice this interesting bit of code:

   512         if ( $image = image_downsize($attachment_id, $size) )
   513                 return $image;
   

   Follow the trail to here and you get this:

   141         // plugins can use this to provide resize services
   142         if ( $out = apply_filters( 'image_downsize', false, $id, $size ) )
   143                 return $out;
   

   If you hook into image_downsize…

   add_filter(
     'image_downsize',
     function ($f,$id,$size) {
       // your own downsize function
   
     },
     10,3
   );
   wp_get_attachment_image_src(4);
   

   … you should be able to return any URL you want, but it means you will need to duplicate more or less the whole of image_downsize() with changes of course.

2. Just to clarify for anyone might stumble upon this in the future, as of 4.3.0 a filter to alter the image src does exist: wp_get_attachment_image_src

   function alterImageSRC($image, $attachment_id, $size, $icon)
   {        
       $image[0] = 'http://newimagesrc.com/myimage.jpg';
   
       return $image;
   }
   add_filter('wp_get_attachment_image_src', 'alterImageSRC', 10, 4);
   

   Note: To filter the srcset of an image use: wp_calculate_image_srcset

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