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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )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.
| Line | Code |
|---|---|
| 978 | $image = image_downsize( $attachment_id, $size ); |
| 979 | if ( ! $image ) { |
| 980 | $src = false; |
| 981 | |
| 982 | if ( $icon ) { |
| 983 | $src = wp_mime_type_icon( $attachment_id, '.svg' ); |
| 984 | |
| 985 | if ( $src ) { |
| 986 | /** This filter is documented in wp-includes/post.php */ |
| 987 | $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' ); |
| 988 | |
| 989 | $src_file = $icon_dir . '/' . wp_basename( $src ); |
| 990 | |
| 991 | list( $width, $height ) = wp_getimagesize( $src_file ); |
| 992 | |
| 993 | $ext = strtolower( substr( $src_file, -4 ) ); |
| 994 | |
| 995 | if ( '.svg' === $ext ) { |
| 996 | // SVG does not have true dimensions, so this assigns width and height directly. |