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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 |
---|---|
2814 |
|
2815 | /** |
2816 | * Filters the SELECT clause of the query. |
2817 | * |
2818 | * @since 2.1.0 |
2819 | * |
2820 | * @param string $fields The SELECT clause of the query. |
2821 | * @param WP_Query $query The WP_Query instance (passed by reference). |
2822 | */ |
2823 | $fields = apply_filters_ref_array( 'posts_fields', array( $fields, &$this ) ); |
2824 |
|
2825 | /** |
2826 | * Filters all query clauses at once, for convenience. |
2827 | * |
2828 | * Covers the WHERE, GROUP BY, JOIN, ORDER BY, DISTINCT, |
2829 | * fields (SELECT), and LIMIT clauses. |
2830 | * |
2831 | * @since 3.1.0 |
2832 | * |