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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 |
|---|---|
| 665 | * Filters the attachment fields to be saved. |
| 666 | * |
| 667 | * @since 2.5.0 |
| 668 | * |
| 669 | * @see wp_get_attachment_metadata() |
| 670 | * |
| 671 | * @param array $post An array of post data. |
| 672 | * @param array $attachment An array of attachment metadata. |
| 673 | */ |
| 674 | $post = apply_filters( 'attachment_fields_to_save', $post, $attachment ); |
| 675 | |
| 676 | if ( isset($attachment['image_alt']) ) { |
| 677 | $image_alt = wp_unslash( $attachment['image_alt'] ); |
| 678 | if ( $image_alt != get_post_meta($attachment_id, '_wp_attachment_image_alt', true) ) { |
| 679 | $image_alt = wp_strip_all_tags( $image_alt, true ); |
| 680 | |
| 681 | // Update_meta expects slashed. |
| 682 | update_post_meta( $attachment_id, '_wp_attachment_image_alt', wp_slash( $image_alt ) ); |
| 683 | } |