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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 |
|---|---|
| 5063 | |
| 5064 | /** |
| 5065 | * Filters the attachment URL. |
| 5066 | * |
| 5067 | * @since 2.1.0 |
| 5068 | * |
| 5069 | * @param string $url URL for the given attachment. |
| 5070 | * @param int $post_id Attachment ID. |
| 5071 | */ |
| 5072 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 5073 | |
| 5074 | if ( empty( $url ) ) |
| 5075 | return false; |
| 5076 | |
| 5077 | return $url; |
| 5078 | } |
| 5079 | |
| 5080 | /** |
| 5081 | * Retrieves the caption for an attachment. |