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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 |
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316 | $image_alt = wp_strip_all_tags( $image_alt, true ); |
317 | // update_meta expects slashed. |
318 | update_post_meta( $post_ID, '_wp_attachment_image_alt', wp_slash( $image_alt ) ); |
319 | } |
320 | } |
321 |
|
322 | $attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array(); |
323 |
|
324 | /** This filter is documented in wp-admin/includes/media.php */ |
325 | $post_data = apply_filters( 'attachment_fields_to_save', $post_data, $attachment_data ); |
326 | } |
327 |
|
328 | // Convert taxonomy input to term IDs, to avoid ambiguity. |
329 | if ( isset( $post_data['tax_input'] ) ) { |
330 | foreach ( (array) $post_data['tax_input'] as $taxonomy => $terms ) { |
331 | // Hierarchical taxonomy data is already sent as term IDs, so no conversion is necessary. |
332 | if ( is_taxonomy_hierarchical( $taxonomy ) ) { |
333 | continue; |
334 | } |