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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 |
|---|---|
| 5172 | * @since 5.1.0 |
| 5173 | * |
| 5174 | * @param string|null $override_slug Short-circuit return value. |
| 5175 | * @param string $slug The desired slug (post_name). |
| 5176 | * @param int $post_id Post ID. |
| 5177 | * @param string $post_status The post status. |
| 5178 | * @param string $post_type Post type. |
| 5179 | * @param int $post_parent Post parent ID. |
| 5180 | */ |
| 5181 | $override_slug = apply_filters( 'pre_wp_unique_post_slug', null, $slug, $post_id, $post_status, $post_type, $post_parent ); |
| 5182 | if ( null !== $override_slug ) { |
| 5183 | return $override_slug; |
| 5184 | } |
| 5185 | |
| 5186 | global $wpdb, $wp_rewrite; |
| 5187 | |
| 5188 | $original_slug = $slug; |
| 5189 | |
| 5190 | $feeds = $wp_rewrite->feeds; |