Specific Pagination Example

page-list.php

#!/usr/bin/env php
<?php

$page = 9;
$max = 16;
$pages = range( 1, $max );

echo "Current page: {$page}\n";

// Case 1 (7 or less pages)
if ( count( $pages ) <= 7 ) {
	print_r( $pages );
	exit;
}

$new_pages = [];

if ( $page <= 5 ) { // Case 2 (Current page less than 5)
	echo "Beginning\n";
	$new_pages = array_slice( $pages, 0, 5 );
	$new_pages[] = '...';
	$new_pages[] = array_pop( $pages );
	$pages = $new_pages;
} elseif ( $page > 5 && $page < ( $max - 3 ) ) { // Case 3 (Current page > 5 but less than $max - 3)
	echo "Middle\n";
	$new_pages[] = $pages[0];
	$new_pages[] = '...';
	$new_pages = array_merge( $new_pages, array_slice( $pages, $page - 2, 3 ) );
	if ( $max - $page <= 3 ) { // Case 3a. 
		$new_pages[] = $pages[ count( $pages ) - 2 ];
	} else { // Case 3b.
		$new_pages[] = '...';
	}
	$new_pages[] = array_pop( $pages );
	$pages = $new_pages;
} else { // Case 4
	echo "End\n";
	$new_pages[] = $pages[0];
	$new_pages[] = '...';
	$new_pages = array_merge( $new_pages, array_slice( $pages, -5 ) );
	$pages = $new_pages;

}

print_r( $pages );