Source View: wp_get_attachment_thumb_url

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Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: apply_filters( "hook_name", "what_to_filter" ).

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

Line Code
4344      $sized = image_downsize( $post_id, 'thumbnail' );
4345      if ( $sized )
4346           return $sized[0];
4347
4348      if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
4349           return false;
4350
4351      $url = str_replace(basename($url), basename($thumb), $url);
4352
4353      return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
4354 }
4355
4356 /**
4357  * Check if the attachment is an image.
4358  *
4359  * @since 2.1.0
4360  *
4361  * @param int $post_id Attachment ID
4362  * @return bool