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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 |
|---|---|
| 2980 | } |
| 2981 | } |
| 2982 | |
| 2983 | if ( empty($url) ) //If any of the above options failed, Fallback on the GUID as used pre-2.7, not recomended to rely upon this. |
| 2984 | $url = get_the_guid( $post->ID ); |
| 2985 | |
| 2986 | if ( 'attachment' != $post->post_type || empty($url) ) |
| 2987 | return false; |
| 2988 | |
| 2989 | return apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 2990 | } |
| 2991 | |
| 2992 | /** |
| 2993 | * Retrieve thumbnail for an attachment. |
| 2994 | * |
| 2995 | * @since 2.1.0 |
| 2996 | * |
| 2997 | * @param int $post_id Attachment ID. |
| 2998 | * @return mixed False on failure. Thumbnail file path on success. |