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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 |
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168 | ); |
169 | /** |
170 | * Filter the list of valid date query columns. |
171 | * |
172 | * @since 3.7.0 |
173 | * |
174 | * @param array $valid_columns An array of valid date query columns. Defaults are 'post_date', 'post_date_gmt', |
175 | * 'post_modified', 'post_modified_gmt', 'comment_date', 'comment_date_gmt' |
176 | */ |
177 | if ( ! in_array( $column, apply_filters( 'date_query_valid_columns', $valid_columns ) ) ) |
178 | $column = 'post_date'; |
179 |
|
180 | return $column; |
181 | } |
182 |
|
183 | /** |
184 | * Turns an array of date query parameters into a MySQL string. |
185 | * |
186 | * @since 3.7.0 |