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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 |
|---|---|
| 106 | if ( $post->post_type == 'page' ) |
| 107 | return get_page_link($post->ID, $leavename, $sample); |
| 108 | elseif ( $post->post_type == 'attachment' ) |
| 109 | return get_attachment_link( $post->ID, $leavename ); |
| 110 | elseif ( in_array($post->post_type, get_post_types( array('_builtin' => false) ) ) ) |
| 111 | return get_post_permalink($post->ID, $leavename, $sample); |
| 112 | |
| 113 | $permalink = get_option('permalink_structure'); |
| 114 | |
| 115 | $permalink = apply_filters('pre_post_link', $permalink, $post, $leavename); |
| 116 | |
| 117 | if ( '' != $permalink && !in_array($post->post_status, array('draft', 'pending', 'auto-draft')) ) { |
| 118 | $unixtime = strtotime($post->post_date); |
| 119 | |
| 120 | $category = ''; |
| 121 | if ( strpos($permalink, '%category%') !== false ) { |
| 122 | $cats = get_the_category($post->ID); |
| 123 | if ( $cats ) { |
| 124 | usort($cats, '_usort_terms_by_ID'); // order by ID |