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<?php
/*
* Paging class. Can be used to page a model or an array
*
* @author Nesbert Hidalgo
*/
class pager {
public $total_records; // total number of records to page
public $total_pages; // total number of pages
public $current; // current page number
public $next; // next page number
public $prev; // previous page number
public $first; // first page number
public $last; // last page number
public $offset; // pointer offest
public $limit; // limit of records per page
public $url; // host url
public function __construct($data = null)
{
$this->set_properties($data);
}
/**
* Set class properties
*
* @author Nesbert Hidalgo
* @access public
* @param array $data required
* @param int $page optional
* @param int $limit optional
*/
public function set_properties($data, $page = null, $limit = null) {
// set vars by type
$page = ( $page ? $page : ( $_GET['page'] ? $_GET['page'] : 1 ) );
$limit = ( $limit ? $limit : ( $_GET['limit'] ? $_GET['limit'] : 10 ) );
switch ( true ) {
case ( is_object($data) ):
$total_records = $data->total_records;
$page = ( isset($data->page) ? $data->page : $page );
$limit = ( isset($data->limit) ? $data->limit : $limit );
break;
case ( is_array($data) ):
$total_records = count($data);
break;
case ( is_numeric($data) ):
$total_records = $data;
break;
}
// set total_records, limit, total_pages
$this->total_records = (int) $total_records;
$this->limit = max((int) $limit, 1);
$this->total_pages = ceil($this->total_records / $this->limit);
// set current page
$this->current = (int) $page;
$this->current = max($this->current, 1);
$this->current = min($this->current, $this->total_pages);
// set offest
$this->offset = max(($this->current - 1) * $this->limit, 0);
// set next & previous pages
$this->next = min($this->current + 1, $this->total_pages);
$this->prev = max($this->current - 1, 1);
$this->first = 1;
$this->last = $this->total_pages;
// set url path
$url = @explode('?', $_SERVER['REQUEST_URI']);
$this->url = $url[0];
}
/**
* Page an array
*
* @author Nesbert Hidalgo
* @access public
* @param array $data required
* @param bool $preserve_keys optional
* @param bool $limit optional
* @return mixed
*/
public function page_array($data, $preserve_keys = true, $limit = false)
{
if ( !$this->total_records ) $this->set_properties($data, null, $limit);
return array_slice($data, $this->offset, $this->limit, $preserve_keys);
}
/**
* Clean/create extra params links
*
* @author Nesbert Hidalgo
* @access public
* @param mixed $data required
* @return mixed
*/
public function params_to_str($data)
{
$data = is_array($data) ? array_merge($_GET, $data) : $_GET;
$str = '';
foreach ( $data as $key => $val ) {
if ( $key == 'page' || $key == 'limit') continue;
$str .="&".$key."=".urlencode($val);
}
return $str;
}
/**
* Create link to page
*
* @author Nesbert Hidalgo
* @access private
* @param string $label required
* @param int $page required
* @param array $extra_params optional
* @param array $html_options optional
* @return string
*/
private function link_to($label, $page, $extra_params = null, $html_options = null)
{
$extra_params = ( isset($_GET['limit']) ? "&limit={$this->limit}" : '' ).$this->params_to_str($extra_params);
$html_options = ( is_array($html_options) ? array_merge(array('href' => $this->url.'?page='.$page.$extra_params), $html_options) : array('href' => $this->url.'?page='.$page.$extra_params) );
return link_to($label, null, null, null, $html_options);
}
/**
* Create link to the mext page
*
* @author Nesbert Hidalgo
* @access public
* @param string $label optional
* @param array $extra_params optional
* @param array $html_options optional
* @return string
*/
public function link_to_next($label = 'Next', $extra_params = null, $html_options = null)
{
return ( $this->current < $this->last ? $this->link_to($label, $this->next, $extra_params, $html_options) : '' );
}
/**
* Create link to the previous page
*
* @author Nesbert Hidalgo
* @access public
* @param string $label optional
* @param array $extra_params optional
* @param array $html_options optional
* @return string
*/
public function link_to_prev($label = 'Prev', $extra_params = null, $html_options = null)
{
return ( $this->current > $this->first ? $this->link_to($label, $this->prev, $extra_params, $html_options) : '' );
}
/**
* Create link to the first page
*
* @author Nesbert Hidalgo
* @access public
* @param string $label optional
* @param array $extra_params optional
* @param array $html_options optional
* @return string
*/
public function link_to_first($label = 'First', $extra_params = null, $html_options = null)
{
return ( $this->current > $this->first ? $this->link_to($label, $this->first, $extra_params, $html_options) : '' );
}
/**
* Create link to the last page
*
* @author Nesbert Hidalgo
* @access public
* @param string $label optional
* @param array $extra_params optional
* @param array $html_options optional
* @return string
*/
public function link_to_last($label = 'Last', $extra_params = null, $html_options = null)
{
return ( $this->current < $this->last ? $this->link_to($label, $this->last, $extra_params, $html_options) : '' );
}
/**
* Create paging links eg. << Prev 1 ... 13 14 15 16 17 ... 25 Next >>
*
* @author Nesbert Hidalgo
* @access public
* @param array $extra_params optional
* @return string
*/
public function paging_links($extra_params = null, $show_label = false)
{
$extra_params = ( isset($_GET['limit']) ? "&limit={$this->limit}" : '' ).$this->params_to_str($extra_params);
$start_page = max($this->current - 2, 1);
if ( $this->total_pages > 1 ) {
$str = '<div class="page-links">';
if ( $show_label ) $str .= $this->paging_label();
if ( $this->current > 1 ) {
$str .= '<a class="prev" href="'.$this->url.'?page='.$this->prev.$extra_params.'">« Prev</a>';
}
if ( ($this->current - 3) >= 1 ) {
$str .= '<a class="page-1" href="'.$this->url.'?page=1'.$extra_params.'">1</a>';
if ( ($this->current - 3) > 1 ) $str .= '<span="dots">...</span>';
}
for ( $i = $start_page; $i <= $this->current + 2; $i++ ) {
if ( $i > $this->total_pages ) break;
if ( $this->current <> $i ) {
$str .= '<a class="page-'.$i.'" href="'.$this->url.'?page='.$i.$extra_params.'">'.$i.'</a>';
} else {
$str .= '<a class="page-'.$i.' current">'.$i.'</a>';
}
}
if ( ($this->current + 3) <= $this->total_pages ) {
if ( ($this->current + 3) < $this->total_pages ) $str .= '<span="dots">...</span>';
$str .= '<a class="page-'.$this->total_pages.'" href="'.$this->url.'?page='.$this->total_pages.$extra_params.'">'.$this->total_pages.'</a>';
}
if ( $this->current < $this->total_pages ) {
$str .= '<a class="next" href="'.$this->url.'?page='.$this->next.$extra_params.'">Next »</a>';
}
$str .= '</div>';
} else {
$str = '';
}
return $str;
}
/**
* Create page limiting selectbox
*
* @author Nesbert Hidalgo
* @access public
* @param array $extra_params optional
* @param array $default_limit optional
* @return string
*/
public function paging_limit($extra_params = null, $default_limit = 10)
{
$extra_params = $this->params_to_str($extra_params);
$default_limit = (int) ( $default_limit ? $default_limit : $this->limit );
$str = '<select OnChange="location.href=this.options[this.selectedIndex].value">'."\n";
// if default_limit not a default value(20,50,100) create option for limit
switch ( $default_limit ) {
case 20:
case 50:
case 100:
break;
default:
$str .= '<option value="'.$this->url.'?page='.$this->current.'&limit='.$default_limit.$extra_params.'"'.( $this->limit == $default_limit ? " selected" : "" ).'>'.$default_limit.'</option>'."\n";
break;
}
$str .= '<option value="'.$this->url.'?page='.$this->current.'&limit=20'.$extra_params.'"'.( $this->limit == 20 ? ' selected="selected"' : '' ).'>20</option>'."\n";
$str .= '<option value="'.$this->url.'?page='.$this->current.'&limit=50'.$extra_params.'"'.( $this->limit == 50 ? ' selected="selected"' : '' ).'>50</option>'."\n";
$str .= '<option value="'.$this->url.'?page='.$this->current.'&limit=100'.$extra_params.'"'.( $this->limit == 100 ? ' selected="selected"' : '' ).'>100</option>'."\n";
$str .= "</select>\n";
return $str;
}
/**
* Create paging label: Page 1 of 10
*
* @author Nesbert Hidalgo
* @access public
* @return string
*/
public function paging_label()
{
return '<span class="page-label">Page '.$this->current.' of '.$this->total_pages.'</span>';
}
}
?>
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