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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 |
|---|---|
| 208 | * |
| 209 | * Only applies to posts with post_type of 'post'. |
| 210 | * |
| 211 | * @since 3.0.0 |
| 212 | * |
| 213 | * @param string $permalink The site's permalink structure. |
| 214 | * @param WP_Post $post The post in question. |
| 215 | * @param bool $leavename Whether to keep the post name. |
| 216 | */ |
| 217 | $permalink = apply_filters( 'pre_post_link', $permalink, $post, $leavename ); |
| 218 | |
| 219 | if ( |
| 220 | $permalink && |
| 221 | ! wp_force_plain_post_permalink( $post ) |
| 222 | ) { |
| 223 | |
| 224 | $category = ''; |
| 225 | if ( strpos( $permalink, '%category%' ) !== false ) { |
| 226 | $cats = get_the_category( $post->ID ); |