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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 |
|---|---|
| 1989 | if ( ! $post ) { |
| 1990 | $output = ''; |
| 1991 | } else { |
| 1992 | $title = $post->post_title; |
| 1993 | |
| 1994 | if ( empty( $post->post_title ) ) |
| 1995 | $title = $previous ? __( 'Previous Post' ) : __( 'Next Post' ); |
| 1996 | |
| 1997 | /** This filter is documented in wp-includes/post-template.php */ |
| 1998 | $title = apply_filters( 'the_title', $title, $post->ID ); |
| 1999 | |
| 2000 | $date = mysql2date( get_option( 'date_format' ), $post->post_date ); |
| 2001 | $rel = $previous ? 'prev' : 'next'; |
| 2002 | |
| 2003 | $string = '<a href="' . get_permalink( $post ) . '" rel="'.$rel.'">'; |
| 2004 | $inlink = str_replace( '%title', $title, $link ); |
| 2005 | $inlink = str_replace( '%date', $date, $inlink ); |
| 2006 | $inlink = $string . $inlink . '</a>'; |
| 2007 | |