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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 |
---|---|
494 | * |
495 | * @since 3.7.0 |
496 | * @since 4.1.0 Added 'user_registered' to the default recognized columns. |
497 | * |
498 | * @param string[] $valid_columns An array of valid date query columns. Defaults |
499 | * are 'post_date', 'post_date_gmt', 'post_modified', |
500 | * 'post_modified_gmt', 'comment_date', 'comment_date_gmt', |
501 | * 'user_registered' |
502 | */ |
503 | if ( ! in_array( $column, apply_filters( 'date_query_valid_columns', $valid_columns ), true ) ) { |
504 | $column = 'post_date'; |
505 | } |
506 |
|
507 | $known_columns = array( |
508 | $wpdb->posts => array( |
509 | 'post_date', |
510 | 'post_date_gmt', |
511 | 'post_modified', |
512 | 'post_modified_gmt', |