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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 |
|---|---|
| 378 | $image_alt = wp_strip_all_tags( $image_alt, true ); |
| 379 | // update_meta expects slashed. |
| 380 | update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) ); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | $attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array(); |
| 385 | |
| 386 | /** This filter is documented in wp-admin/includes/media.php */ |
| 387 | $translated = apply_filters( 'attachment_fields_to_save', $translated, $attachment_data ); |
| 388 | } |
| 389 | |
| 390 | // Convert taxonomy input to term IDs, to avoid ambiguity. |
| 391 | if ( isset( $post_data['tax_input'] ) ) { |
| 392 | foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) { |
| 393 | $tax_object = get_taxonomy( $taxonomy ); |
| 394 | |
| 395 | if ( $tax_object && isset( $tax_object->meta_box_sanitize_cb ) ) { |
| 396 | $translated['tax_input'][ $taxonomy ] = call_user_func_array( $tax_object->meta_box_sanitize_cb, array( $taxonomy, $terms ) ); |