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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 |
|---|---|
| 1975 | if ( ! $post ) { |
| 1976 | $output = ''; |
| 1977 | } else { |
| 1978 | $title = $post->post_title; |
| 1979 | |
| 1980 | if ( empty( $post->post_title ) ) |
| 1981 | $title = $previous ? __( 'Previous Post' ) : __( 'Next Post' ); |
| 1982 | |
| 1983 | /** This filter is documented in wp-includes/post-template.php */ |
| 1984 | $title = apply_filters( 'the_title', $title, $post->ID ); |
| 1985 | |
| 1986 | $date = mysql2date( get_option( 'date_format' ), $post->post_date ); |
| 1987 | $rel = $previous ? 'prev' : 'next'; |
| 1988 | |
| 1989 | $string = '<a href="' . get_permalink( $post ) . '" rel="'.$rel.'">'; |
| 1990 | $inlink = str_replace( '%title', $title, $link ); |
| 1991 | $inlink = str_replace( '%date', $date, $inlink ); |
| 1992 | $inlink = $string . $inlink . '</a>'; |
| 1993 | |