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Source View: posts_fields

To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).

Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: 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.

Source View

Line Code
3213
3214                /**
3215                 * Filter the SELECT clause of the query.
3216                 *
3217                 * @since 2.1.0
3218                 *
3219                 * @param string   $fields The SELECT clause of the query.
3220                 * @param WP_Query &$this  The WP_Query instance (passed by reference).
3221                 */
3222                $fields = apply_filters_ref_array( 'posts_fields', array( $fields, &$this ) );
3223
3224                /**
3225                 * Filter all query clauses at once, for convenience.
3226                 *
3227                 * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT,
3228                 * fields (SELECT), and LIMITS clauses.
3229                 *
3230                 * @since 3.1.0
3231                 *