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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 |
|---|---|
| 171 | ); |
| 172 | /** |
| 173 | * Filter the list of valid date query columns. |
| 174 | * |
| 175 | * @since 3.7.0 |
| 176 | * |
| 177 | * @param array $valid_columns An array of valid date query columns. Defaults are 'post_date', 'post_date_gmt', |
| 178 | * 'post_modified', 'post_modified_gmt', 'comment_date', 'comment_date_gmt' |
| 179 | */ |
| 180 | if ( ! in_array( $column, apply_filters( 'date_query_valid_columns', $valid_columns ) ) ) |
| 181 | $column = 'post_date'; |
| 182 | |
| 183 | return $column; |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Turns an array of date query parameters into a MySQL string. |
| 188 | * |
| 189 | * @since 3.7.0 |