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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 |
|---|---|
| 315 | $image_alt = wp_strip_all_tags( $image_alt, true ); |
| 316 | // update_meta expects slashed. |
| 317 | update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) ); |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | $attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array(); |
| 322 | |
| 323 | /** This filter is documented in wp-admin/includes/media.php */ |
| 324 | $post_data = apply_filters( 'attachment_fields_to_save', $post_data, $attachment_data ); |
| 325 | } |
| 326 | |
| 327 | // Convert taxonomy input to term IDs, to avoid ambiguity. |
| 328 | if ( isset( $post_data['tax_input'] ) ) { |
| 329 | foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) { |
| 330 | // Hierarchical taxonomy data is already sent as term IDs, so no conversion is necessary. |
| 331 | if ( is_taxonomy_hierarchical( $taxonomy ) ) { |
| 332 | continue; |
| 333 | } |