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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 |
|---|---|
| 5149 | |
| 5150 | /** |
| 5151 | * Filters the attachment URL. |
| 5152 | * |
| 5153 | * @since 2.1.0 |
| 5154 | * |
| 5155 | * @param string $url URL for the given attachment. |
| 5156 | * @param int $attachment_id Attachment post ID. |
| 5157 | */ |
| 5158 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 5159 | |
| 5160 | if ( empty( $url ) ) |
| 5161 | return false; |
| 5162 | |
| 5163 | return $url; |
| 5164 | } |
| 5165 | |
| 5166 | /** |
| 5167 | * Retrieves the caption for an attachment. |