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
4244      $sized = image_downsize( $post_id, 'thumbnail' );
4245      if ( $sized )
4246           return $sized[0];
4247
4248      if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
4249           return false;
4250
4251      $url = str_replace(basename($url), basename($thumb), $url);
4252
4253      return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
4254 }
4255
4256 /**
4257  * Check if the attachment is an image.
4258  *
4259  * @since 2.1.0
4260  *
4261  * @param int $post_id Attachment ID
4262  * @return bool