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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 |
|---|---|
| 4153 | * @param int $post_id Attachment ID. |
| 4154 | * @param array $data Attachment data. |
| 4155 | * @return int |
| 4156 | */ |
| 4157 | function wp_update_attachment_metadata( $post_id, $data ) { |
| 4158 | $post_id = (int) $post_id; |
| 4159 | if ( !$post = get_post( $post_id ) ) |
| 4160 | return false; |
| 4161 | |
| 4162 | if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) ) |
| 4163 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data ); |
| 4164 | else |
| 4165 | return delete_post_meta( $post->ID, '_wp_attachment_metadata' ); |
| 4166 | } |
| 4167 | |
| 4168 | /** |
| 4169 | * Retrieve the URL for an attachment. |
| 4170 | * |
| 4171 | * @since 2.1.0 |