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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 |
|---|---|
| 649 | * Filter the attachment fields to be saved. |
| 650 | * |
| 651 | * @since 2.5.0 |
| 652 | * |
| 653 | * @see wp_get_attachment_metadata() |
| 654 | * |
| 655 | * @param WP_Post $post The WP_Post object. |
| 656 | * @param array $attachment An array of attachment metadata. |
| 657 | */ |
| 658 | $post = apply_filters( 'attachment_fields_to_save', $post, $attachment ); |
| 659 | |
| 660 | if ( isset($attachment['image_alt']) ) { |
| 661 | $image_alt = wp_unslash( $attachment['image_alt'] ); |
| 662 | if ( $image_alt != get_post_meta($attachment_id, '_wp_attachment_image_alt', true) ) { |
| 663 | $image_alt = wp_strip_all_tags( $image_alt, true ); |
| 664 | |
| 665 | // Update_meta expects slashed. |
| 666 | update_post_meta( $attachment_id, '_wp_attachment_image_alt', wp_slash( $image_alt ) ); |
| 667 | } |