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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 |
|---|---|
| 3138 | * passed to the filter by reference. If WP_Query does not perform a database |
| 3139 | * query, it will not have enough information to generate these values itself. |
| 3140 | * |
| 3141 | * @since 4.6.0 |
| 3142 | * |
| 3143 | * @param WP_Post[]|int[]|null $posts Return an array of post data to short-circuit WP's query, |
| 3144 | * or null to allow WP to run its normal queries. |
| 3145 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 3146 | */ |
| 3147 | $this->posts = apply_filters_ref_array( 'posts_pre_query', array( null, &$this ) ); |
| 3148 | |
| 3149 | /* |
| 3150 | * Ensure the ID database query is able to be cached. |
| 3151 | * |
| 3152 | * Random queries are expected to have unpredictable results and |
| 3153 | * cannot be cached. Note the space before `RAND` in the string |
| 3154 | * search, that to ensure against a collision with another |
| 3155 | * function. |
| 3156 | * |