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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 |
|---|---|
| 501 | * |
| 502 | * @since 3.7.0 |
| 503 | * @since 4.1.0 Added 'user_registered' to the default recognized columns. |
| 504 | * |
| 505 | * @param array $valid_columns An array of valid date query columns. Defaults |
| 506 | * are 'post_date', 'post_date_gmt', 'post_modified', |
| 507 | * 'post_modified_gmt', 'comment_date', 'comment_date_gmt', |
| 508 | * 'user_registered' |
| 509 | */ |
| 510 | if ( ! in_array( $column, apply_filters( 'date_query_valid_columns', $valid_columns ) ) ) { |
| 511 | $column = 'post_date'; |
| 512 | } |
| 513 | |
| 514 | $known_columns = array( |
| 515 | $wpdb->posts => array( |
| 516 | 'post_date', |
| 517 | 'post_date_gmt', |
| 518 | 'post_modified', |
| 519 | 'post_modified_gmt', |