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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 |
|---|---|
| 1939 | $src_file = basename($src); |
| 1940 | } elseif ( wp_attachment_is_image( $post->ID ) ) { |
| 1941 | // We have an image without a thumbnail |
| 1942 | |
| 1943 | $src = wp_get_attachment_url( $post->ID ); |
| 1944 | $src_file = & $file; |
| 1945 | } elseif ( $src = wp_mime_type_icon( $post->ID ) ) { |
| 1946 | // No thumb, no image. We'll look for a mime-related icon instead. |
| 1947 | |
| 1948 | $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' ); |
| 1949 | $src_file = $icon_dir . '/' . basename($src); |
| 1950 | } |
| 1951 | |
| 1952 | if ( !isset($src) || !$src ) |
| 1953 | return false; |
| 1954 | |
| 1955 | return array($src, $src_file); |
| 1956 | } |
| 1957 | |