Wordpress function to switch auto-embed Soundcloud player from large "visual" version to "mini"

wordpress-embed-soundcloud-mini-player.php

<?php

/////////////////////////////////////////////////////////////////////////////////////
// Ask Wordpress to Embed Soundcloud’s Mini Player Instead of the Large Visual Player
/////////////////////////////////////////////////////////////////////////////////////
// Add function to theme’s functions.php file
// Relevant documentation:
// https://wordpress.org/support/topic/hookfilter-for-auto-embed-function-of-wp
// https://wordpress.org/support/topic/filter-hook-for-built-in-oembed-providers-eg-youtube
// https://developers.soundcloud.com/docs/oembed


function soundCloud_mini_embed($html, $url) {
  
  // Only use this filter on Soundcloud embeds
  if(preg_match("/soundcloud.com/", $url)) {
    
    // array of patterns to find in the oembed iframe html
    $patterns = array();
      $patterns[0] = "/visual=true/"; // true means a big image background
      $patterns[1] = "/show_artwork=true/"; // true means show the track artwork
      $patterns[2] = "/ height=\"\d+?\"/"; // height of standard embed is in the 400-pixel range. Just look for any height integer
      $patterns[3] = "/ width=\"\d+?\"/"; // width of standard embed in Wordpress seems to be a fixed pixel width. Look for any integer
    
    // array of replacements to make for these patterns
    $replacements = array();
      $replacements[0] = "visual=false"; // turn off big image background
      $replacements[1] = "show_artwork=false"; // turn off track artwork
      $replacements[2] = " height=\"166\""; // set iframe height to 166 pixels, the embed standard for the Soundcloud mini player
      $replacements[3] = " width=\"100%\""; // set iframe to full width instead of fixed pixel dimension
    
    // prophylactic ksort to make sure that all patterns and replacments will line up regardless of what order they're input
    ksort($patterns);
    ksort($replacements);
    
    // one function to do all the find and replace
    $html = preg_replace($patterns, $replacements, $html);
    // return the html string and save to database or output
    return $html;
  }
  
}
// hook into the Wordpress oembed filter
add_filter('embed_oembed_html', 'soundCloud_mini_embed', 10, 3);

?>

Thanks @gfscott
Thanks @aprea 'oembed_result' hook allows the code to work even with the ACF PRO oembed field ;)

You need to move
return $html;
to below the end of the if statement or it removes all other embeds

In case anyone needs a modified version that clears oEmbed cache, frafor shared one on StackOverflow a year ago or so: https://stackoverflow.com/questions/38014314/wordpress-soundcloud-embed-match-and-replace-parameters-with-regex

Thanks for this!

Playlists were looking like single tracks, so I added a conditional to check for /sets/ in the url and change the height to 300px:

      $replacements[2] = " height=\"166\""; // set iframe height to 166 pixels, the embed standard for the Soundcloud mini player
      if (preg_match("/sets/", $url)) {
	      $replacements[2] = " height=\"300\""; // set iframe height to 300 pixels if it's a playlist
      }

Hey man, great resource. Just wanted to suggest the same thing @olimax said a few years back. It needs line 39 moved to where line 41 is now. Otherwise other embeds don't work!