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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 |
|---|---|
| 304 | $image_alt = wp_strip_all_tags( $image_alt, true ); |
| 305 | // update_meta expects slashed |
| 306 | update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) ); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | $attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array(); |
| 311 | |
| 312 | /** This filter is documented in wp-admin/includes/media.php */ |
| 313 | $post_data = apply_filters( 'attachment_fields_to_save', $post_data, $attachment_data ); |
| 314 | } |
| 315 | |
| 316 | add_meta( $post_ID ); |
| 317 | |
| 318 | update_post_meta( $post_ID, '_edit_last', get_current_user_id() ); |
| 319 | |
| 320 | wp_update_post( $post_data ); |
| 321 | |
| 322 | // Now that we have an ID we can fix any attachment anchor hrefs |