如何仅删除图像宽度和高度，而不是iframe？ 代码包括在内

Question

The code I'm currently using in my wordpress functions file is this:

function remove_width_attribute( $html ) {
   $html = preg_replace( '/(width|height)=("|\')\d*(|px)("|\')\s/', "", $html );
   return $html;
}
add_filter( 'the_content', 'remove_width_attribute', 10 );

The problem here is that it targets iframes too, so how would I rewrite the regex to say images only?

Answer 1

I would just use non capturing groups to search for the img tag before the other statements, something like

(?:img.*)(width|height ?= ?['"].*['"])

Which you can see working here: http://regex101.com/r/mI1bD5.

Note that this fails in a lot of simple cases (iframe on the same line as an img tag for example), but it should push you in the right direction.