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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 |
|---|---|
| 679 | if ( $i <= $numpages ) { |
| 680 | $link = _wp_link_page( $i ) . $link_before . $nextpagelink . $link_after . '</a>'; |
| 681 | $link = apply_filters( 'wp_link_pages_link', $link, $i ); |
| 682 | $output .= $separator . $link; |
| 683 | } |
| 684 | $output .= $after; |
| 685 | } |
| 686 | } |
| 687 | |
| 688 | $output = apply_filters( 'wp_link_pages', $output, $args ); |
| 689 | |
| 690 | if ( $echo ) |
| 691 | echo $output; |
| 692 | |
| 693 | return $output; |
| 694 | } |
| 695 | |
| 696 | /** |
| 697 | * Helper function for wp_link_pages(). |