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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 |
|---|---|
| 156 | * |
| 157 | * Only applies to posts with post_type of 'post'. |
| 158 | * |
| 159 | * @since 3.0.0 |
| 160 | * |
| 161 | * @param string $permalink The site's permalink structure. |
| 162 | * @param WP_Post $post The post in question. |
| 163 | * @param bool $leavename Whether to keep the post name. |
| 164 | */ |
| 165 | $permalink = apply_filters( 'pre_post_link', $permalink, $post, $leavename ); |
| 166 | |
| 167 | if ( |
| 168 | $permalink && |
| 169 | ! in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft', 'future', 'trash' ), true ) |
| 170 | ) { |
| 171 | |
| 172 | $category = ''; |
| 173 | if ( strpos( $permalink, '%category%' ) !== false ) { |
| 174 | $cats = get_the_category( $post->ID ); |