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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 |
|---|---|
| 412 | |
| 413 | // update_post_meta() expects slashed. |
| 414 | update_post_meta( $post_id, '_wp_attachment_image_alt', wp_slash( $image_alt ) ); |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | $attachment_data = isset( $post_data['attachments'][ $post_id ] ) ? $post_data['attachments'][ $post_id ] : array(); |
| 419 | |
| 420 | /** This filter is documented in wp-admin/includes/media.php */ |
| 421 | $translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data ); |
| 422 | } |
| 423 | |
| 424 | // Convert taxonomy input to term IDs, to avoid ambiguity. |
| 425 | if ( isset( $post_data['tax_input'] ) ) { |
| 426 | foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) { |
| 427 | $tax_object = get_taxonomy( $taxonomy ); |
| 428 | |
| 429 | if ( $tax_object && isset( $tax_object->meta_box_sanitize_cb ) ) { |
| 430 | $translated['tax_input'][ $taxonomy ] = call_user_func_array( $tax_object->meta_box_sanitize_cb, array( $taxonomy, $terms ) ); |