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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 |
|---|---|
| 4209 | $url = $uploads['baseurl'] . substr( $file, strpos($file, 'wp-content/uploads') + 18 ); |
| 4210 | else |
| 4211 | $url = $uploads['baseurl'] . "/$file"; //Its a newly uploaded file, therefor $file is relative to the basedir. |
| 4212 | } |
| 4213 | } |
| 4214 | |
| 4215 | if ( empty($url) ) //If any of the above options failed, Fallback on the GUID as used pre-2.7, not recommended to rely upon this. |
| 4216 | $url = get_the_guid( $post->ID ); |
| 4217 | |
| 4218 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 4219 | |
| 4220 | if ( empty( $url ) ) |
| 4221 | return false; |
| 4222 | |
| 4223 | return $url; |
| 4224 | } |
| 4225 | |
| 4226 | /** |
| 4227 | * Retrieve thumbnail for an attachment. |