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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 |
|---|---|
| 6074 | |
| 6075 | /** |
| 6076 | * Filters the attachment URL. |
| 6077 | * |
| 6078 | * @since 2.1.0 |
| 6079 | * |
| 6080 | * @param string $url URL for the given attachment. |
| 6081 | * @param int $attachment_id Attachment post ID. |
| 6082 | */ |
| 6083 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 6084 | |
| 6085 | if ( empty( $url ) ) { |
| 6086 | return false; |
| 6087 | } |
| 6088 | |
| 6089 | return $url; |
| 6090 | } |
| 6091 | |
| 6092 | /** |