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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 |
|---|---|
| 3935 | $post_id = (int) $post_id; |
| 3936 | if ( !$post =& get_post( $post_id ) ) |
| 3937 | return false; |
| 3938 | if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) ) |
| 3939 | return false; |
| 3940 | |
| 3941 | $file = get_attached_file( $post->ID ); |
| 3942 | |
| 3943 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) |
| 3944 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 3945 | return false; |
| 3946 | } |
| 3947 | |
| 3948 | /** |
| 3949 | * Retrieve URL for an attachment thumbnail. |
| 3950 | * |
| 3951 | * @since 2.1.0 |
| 3952 | * |
| 3953 | * @param int $post_id Attachment ID |