Uno de los detalles que tenemos al ya tener publicadas varias entradas es la paginación, para resolver estos detalles existen diversos plugins que se pueden encargar de una manera muy simple, tal es el caso de WP-PageNavi que con solo instalarlo y colocar un código en nuestros documentos PHP sera 100% funcional.
Pero también existe otra forma que tiene la misma funcionalidad y simpleza que el instalar este famoso plugin y además de todo no consume la misma cantidad de recursos, a continuación les explicare como realizar una paginación con solo usar código.
Lo primero que tenemos que hacer es copiar lo siguiente en el archivo functions.php si no lo tienen lo pueden crear o descargar desde este post (al final pongo el link).
<?php
/***** Numbered Page Navigation (Pagination) Code.
Tested up to WordPress version 3.1.2 *****/
/* Function that Rounds To The Nearest Value.
Needed for the pagenavi() function */
function round_num($num, $to_nearest) {
/*Round fractions down (http://php.net/manual/en/function.floor.php)*/
return floor($num/$to_nearest)*$to_nearest;
}
/* Function that performs a Boxed Style Numbered Pagination (also called Page Navigation).
Function is largely based on Version 2.4 of the WP-PageNavi plugin */
function pagenavi($before = », $after = ») {
global $wpdb, $wp_query;
$pagenavi_options = array();
$pagenavi_options[‘pages_text’] = (‘Página %CURRENT_PAGE% de %TOTAL_PAGES%:’);
$pagenavi_options[‘current_text’] = ‘%PAGE_NUMBER%’;
$pagenavi_options[‘page_text’] = ‘%PAGE_NUMBER%’;
$pagenavi_options[‘first_text’] = (‘Primera’);
$pagenavi_options[‘last_text’] = (‘Última’);
$pagenavi_options[‘next_text’] = ‘Siguiente »’;
$pagenavi_options[‘prev_text’] = ‘« Anterior’;
$pagenavi_options[‘dotright_text’] = ‘…’;
$pagenavi_options[‘dotleft_text’] = ‘…’;
$pagenavi_options[‘num_pages’] = 5; //continuous block of page numbers
$pagenavi_options[‘always_show’] = 0;
$pagenavi_options[‘num_larger_page_numbers’] = 0;
$pagenavi_options[‘larger_page_numbers_multiple’] = 5;
//If NOT a single Post is being displayed
/*http://codex.wordpress.org/Function_Reference/is_single)*/
if (!is_single()) {
$request = $wp_query->request;
//intval — Get the integer value of a variable
/*http://php.net/manual/en/function.intval.php*/
$posts_per_page = intval(get_query_var(‘posts_per_page’));
//Retrieve variable in the WP_Query class.
/*http://codex.wordpress.org/Function_Reference/get_query_var*/
$paged = intval(get_query_var(‘paged’));
$numposts = $wp_query->found_posts;
$max_page = $wp_query->max_num_pages;
//empty — Determine whether a variable is empty
/*http://php.net/manual/en/function.empty.php*/
if(empty($paged) || $paged == 0) {
$paged = 1;
}
$pages_to_show = intval($pagenavi_options[‘num_pages’]);
$larger_page_to_show = intval($pagenavi_options[‘num_larger_page_numbers’]);
$larger_page_multiple = intval($pagenavi_options[‘larger_page_numbers_multiple’]);
$pages_to_show_minus_1 = $pages_to_show – 1;
$half_page_start = floor($pages_to_show_minus_1/2);
//ceil — Round fractions up (http://us2.php.net/manual/en/function.ceil.php)
$half_page_end = ceil($pages_to_show_minus_1/2);
$start_page = $paged – $half_page_start;
if($start_page <= 0) {
$start_page = 1;
}
$end_page = $paged + $half_page_end;
if(($end_page – $start_page) != $pages_to_show_minus_1) {
$end_page = $start_page + $pages_to_show_minus_1;
}
if($end_page > $max_page) {
$start_page = $max_page – $pages_to_show_minus_1;
$end_page = $max_page;
}
if($start_page <= 0) {
$start_page = 1;
}
$larger_per_page = $larger_page_to_show*$larger_page_multiple;
//round_num() custom function – Rounds To The Nearest Value.
$larger_start_page_start = (round_num($start_page, 10) + $larger_page_multiple) – $larger_per_page;
$larger_start_page_end = round_num($start_page, 10) + $larger_page_multiple;
$larger_end_page_start = round_num($end_page, 10) + $larger_page_multiple;
$larger_end_page_end = round_num($end_page, 10) + ($larger_per_page);
if($larger_start_page_end – $larger_page_multiple == $start_page) {
$larger_start_page_start = $larger_start_page_start – $larger_page_multiple;
$larger_start_page_end = $larger_start_page_end – $larger_page_multiple;
}
if($larger_start_page_start <= 0) {
$larger_start_page_start = $larger_page_multiple;
}
if($larger_start_page_end > $max_page) {
$larger_start_page_end = $max_page;
}
if($larger_end_page_end > $max_page) {
$larger_end_page_end = $max_page;
}
if($max_page > 1 || intval($pagenavi_options[‘always_show’]) == 1) {
/*http://php.net/manual/en/function.str-replace.php */
/*number_format_i18n(): Converts integer number to format based on locale (wp-includes/functions.php*/
$pages_text = str_replace(«%CURRENT_PAGE%», number_format_i18n($paged), $pagenavi_options[‘pages_text’]);
$pages_text = str_replace(«%TOTAL_PAGES%», number_format_i18n($max_page), $pages_text);
echo $before.'<div class=»pagenavi»>’.»n»;
if(!empty($pages_text)) {
echo ‘<span class=»pages»>’.$pages_text.'</span>’;
}
//Displays a link to the previous post which exists in chronological order from the current post.
/*http://codex.wordpress.org/Function_Reference/previous_post_link*/
previous_posts_link($pagenavi_options[‘prev_text’]);
if ($start_page >= 2 && $pages_to_show < $max_page) {
$first_page_text = str_replace(«%TOTAL_PAGES%», number_format_i18n($max_page), $pagenavi_options[‘first_text’]);
//esc_url(): Encodes < > & » ‘ (less than, greater than, ampersand, double quote, single quote).
/*http://codex.wordpress.org/Data_Validation*/
//get_pagenum_link():(wp-includes/link-template.php)-Retrieve get links for page numbers.
echo ‘<a href=»‘.esc_url(get_pagenum_link()).'» title=»‘.$first_page_text.'»>1</a>’;
if(!empty($pagenavi_options[‘dotleft_text’])) {
echo ‘<span class=»expand»>’.$pagenavi_options[‘dotleft_text’].'</span>’;
}
}
if($larger_page_to_show > 0 && $larger_start_page_start > 0 && $larger_start_page_end <= $max_page) {
for($i = $larger_start_page_start; $i < $larger_start_page_end; $i+=$larger_page_multiple) {
$page_text = str_replace(«%PAGE_NUMBER%», number_format_i18n($i), $pagenavi_options[‘page_text’]);
echo ‘<a href=»‘.esc_url(get_pagenum_link($i)).'» class=»single_page» title=»‘.$page_text.'»>’.$page_text.'</a>’;
}
}
for($i = $start_page; $i <= $end_page; $i++) {
if($i == $paged) {
$current_page_text = str_replace(«%PAGE_NUMBER%», number_format_i18n($i), $pagenavi_options[‘current_text’]);
echo ‘<span class=»current»>’.$current_page_text.'</span>’;
} else {
$page_text = str_replace(«%PAGE_NUMBER%», number_format_i18n($i), $pagenavi_options[‘page_text’]);
echo ‘<a href=»‘.esc_url(get_pagenum_link($i)).'» class=»single_page» title=»‘.$page_text.'»>’.$page_text.'</a>’;
}
}
if ($end_page < $max_page) {
if(!empty($pagenavi_options[‘dotright_text’])) {
echo ‘<span class=»expand»>’.$pagenavi_options[‘dotright_text’].'</span>’;
}
$last_page_text = str_replace(«%TOTAL_PAGES%», number_format_i18n($max_page), $pagenavi_options[‘last_text’]);
echo ‘<a href=»‘.esc_url(get_pagenum_link($max_page)).'» class=»last» title=»‘.$last_page_text.'»>’.$max_page.'</a>’;
}
next_posts_link($pagenavi_options[‘next_text’], $max_page);
if($larger_page_to_show > 0 && $larger_end_page_start < $max_page) {
for($i = $larger_end_page_start; $i <= $larger_end_page_end; $i+=$larger_page_multiple) {
$page_text = str_replace(«%PAGE_NUMBER%», number_format_i18n($i), $pagenavi_options[‘page_text’]);
echo ‘<a href=»‘.esc_url(get_pagenum_link($i)).'» class=»single_page» title=»‘.$page_text.'»>’.$page_text.'</a>’;
}
}
echo ‘</div>’.$after.»n»;
}
}
}
?>
Con esto ya estamos sustituyendo el plugin de paginación, ahora solo queda llamar la función correspondiente en los archivos que necesitemos. Para ello copiamos y pegamos el siguiente código:
<?php if(function_exists(‘pagenavi’)) { pagenavi(); } ?>
Descarga el archivo functions.php haciendo clic aquí.