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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 |
|---|---|
| 148 | * |
| 149 | * Only applies to posts with post_type of 'post'. |
| 150 | * |
| 151 | * @since 3.0.0 |
| 152 | * |
| 153 | * @param string $permalink The site's permalink structure. |
| 154 | * @param WP_Post $post The post in question. |
| 155 | * @param bool $leavename Whether to keep the post name. |
| 156 | */ |
| 157 | $permalink = apply_filters( 'pre_post_link', $permalink, $post, $leavename ); |
| 158 | |
| 159 | if ( '' != $permalink && !in_array( $post->post_status, array( 'draft', 'pending', 'auto-draft', 'future' ) ) ) { |
| 160 | $unixtime = strtotime($post->post_date); |
| 161 | |
| 162 | $category = ''; |
| 163 | if ( strpos($permalink, '%category%') !== false ) { |
| 164 | $cats = get_the_category($post->ID); |
| 165 | if ( $cats ) { |
| 166 | usort($cats, '_usort_terms_by_ID'); // order by ID |