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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 |
|---|---|
| 230 | $image_alt = get_post_meta( $post_ID, '_wp_attachment_image_alt', true ); |
| 231 | if ( $image_alt != stripslashes( $post_data['_wp_attachment_image_alt'] ) ) { |
| 232 | $image_alt = wp_strip_all_tags( stripslashes( $post_data['_wp_attachment_image_alt'] ), true ); |
| 233 | // update_meta expects slashed |
| 234 | update_post_meta( $post_ID, '_wp_attachment_image_alt', addslashes( $image_alt ) ); |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | $attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array(); |
| 239 | $post_data = apply_filters( 'attachment_fields_to_save', $post_data, $attachment_data ); |
| 240 | } |
| 241 | |
| 242 | add_meta( $post_ID ); |
| 243 | |
| 244 | update_post_meta( $post_ID, '_edit_last', $GLOBALS['current_user']->ID ); |
| 245 | |
| 246 | wp_update_post( $post_data ); |
| 247 | |
| 248 | // Now that we have an ID we can fix any attachment anchor hrefs |