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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 |
---|---|
3977 | if ( $update ) { |
3978 | /** |
3979 | * Fires immediately before an existing post is updated in the database. |
3980 | * |
3981 | * @since 2.5.0 |
3982 | * |
3983 | * @param int $post_ID Post ID. |
3984 | * @param array $data Array of unslashed post data. |
3985 | */ |
3986 | do_action( 'pre_post_update', $post_ID, $data ); |
3987 |
|
3988 | if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) { |
3989 | if ( $wp_error ) { |
3990 | if ( 'attachment' === $post_type ) { |
3991 | $message = __( 'Could not update attachment in the database.' ); |
3992 | } else { |
3993 | $message = __( 'Could not update post in the database.' ); |
3994 | } |
3995 |
|