index.php

<?php

require_once 'connections/config.php';
require_once 'connections/PDO_Pagination.php';


try {
    /**
     * The PDO String connection is for mysql
     * Check the documentation for your database
     */
    $connection = new PDO(
        'mysql:host=localhost;dbname=db_employee', 
        'root', 
        ''
    );  
    /** As I am brazilian I always use UTF-8 enconding 
     * in files, connections and charset 
     */
    $connection->query("SET NAMES UTF8");
    
} catch ( PDOException $e ) {
    
    print "Error!: " . $e->getMessage() . "<br/>";
    die();
    
}

/** 
 * Here we make an object from PDO_Pagination 
 * injecting the $connection variable that is an instance of PDO
 **/
$pagination = new PDO_Pagination( $connection );

/**
 * Once you have created an PDO_Pagination object you can
 * set the following parameters:
 * 
 * @example
 *   $pagination->setLimitPerPage( $limit );
 *   $pagination->setPaginator( $paginator );
 *   $pagination->setRange( $range );
 *   $pagination->setSQL( $string );
 *  
 */



/** Duh, the SQL itself **/
$n = 2; // change this to the number of records you want per page
$pagination->setSQL( "SELECT * FROM emp_ table " );
$pagination->setPaginator( 'page' );

$results = $connection->query( $pagination->getSQL() );

/**
 * Basic HTML for testing purpuses. No styles in the package 
 * Feel free style it as you wish the following selectors
 * #result-bar {} 
 * #result-bar span {}
 * #result-bar-not-found {}
 * #navigation-bar {}
 * #navigation-bar a span {}
 * #navigation-bar a.first {}
 * #navigation-bar a.previous {} 
 * #navigation-bar a.current {}
 * #navigation-bar a.others {}
 * #navigation-bar a.next {}
 * #navigation-bar a.last {}  
 */


/**
 * The result bar will inform you if no results were found
 * so you should keep it outside the controll structure below 
 */


if( $pagination->getTotalOfResults() > 0    ) {
	?>


<!-- con close -->

 <table cellpadding="0" cellspacing="0" border="0" id="table" class="sortable">
  <thead>
    <tr>
      <th><h3>serialno</h3></th>
      <th><h3>name</h3></th>
      <th><h3>address</h3></th>
      <th><h3>city</h3></th>
      
      
     
      
    </tr>
    </thead>
    
    
    
      <?php
    $i = ($pagination->getCurrentPage() - 1) * $n + 1;
    foreach( $results as $r ) {
		?>
      <tr>
        <td  style="width:35px; padding-left:10px; color:#F00;"><?php echo $i++ ?></td>
        <td  style="width:300px;padding-left:10px;"><a href="<?php echo $r['name']; ?>" target="_blank" ><?php echo $r['name']; ?></td>
        <td style="width:15px;padding-left:7px; padding-right:7px;color:#090;"><?php echo $r['add']; ?></td>
        
        <td style="width:65px;padding-left:10px; color:#666666"><?php echo $r['city']; ?></td>
        
        <?php
    }?>
      </tr>
     
      </tbody>
      
  </table>
  
<br /><br />
 
<?php
 
    
$pagination->printResultBar();
    $pagination->printNavigationBar();
}



?>



</body>
</html>

PDO_Pagination.php

<?php
/**
 * This package can be used to display query results split in pages using PDO
 * 
 * It is based on my primary classe available on 
 * http://www.phpclasses.org/browse/file/40496.html
 * and since the most usage is been from countries outside Brazil
 * I've ported the class methods and properties names to English
 * 
 * It can have multiple connections by Depedency Injection 
 * and takes a SQL query and executes it once to retrieve 
 * the total number of rows that it would return.
 * It can generate HTML with links to go other pages of the the results listing, 
 * given the current listing page number and the limit of results to display per page.
 *
 * @category   Database Pagination
 * @package    PDO_Pagination
 * @author     Gilberto Albino <www@gilbertoalbino.com>
 * @copyright  2010-2012 Gilberto Albino
 * @license    Not applied
 * @version    Release: 2.0
 * @since      Class available since Release 1.2.0
 * @deprecated Class deprecated in Release 2.0.0
 */
class PDO_Pagination {

    /**
     * The PDO object to be used on every connection requested
     * @var PDO
     */
    private $_connection;
    
    /**
     * The string for identifying the pager value
     * Has to be from GET or POST
     * @var string 
     */
    private $_paginator = 'page';
      
    /**
     * The SQL string itself
     * @var string 
     */
    private $_sql;
    
    /**
     * The total of results per age
     * @var type 
     */
    private $_limit_per_page = 50;
    
    /**
     * The total of pages in the menu 
     * @var type 
     */
    private $_range = 5;

    /**
     * The constructor gets the PDO conection object
     * 
     * @param PDO $connection 
     */
    public function __construct( $connection ) 
    {
        
        $this->setConnection( $connection );
        $this->getPager();
        
    }
    
    /**
     * This method gets the total of results found by querying the database
     * It can be accessed outside to check if no records were found
     * so that you can prevent some html code to be rendered
     * Note that we don't use getSQL but _sql property
     * It's because the getSEL returns the LIMIT and OFFSET
     * 
     * @return int
     */
    public function getTotalOfResults() 
    {
        $result = $this->_connection->query(
            str_replace( '*', 'COUNT(*)', $this->_sql )
        );

        return (int) $result->fetchColumn();
        
    }

    /**
     * This method is a helper method for
     * validating the connection checking
     * if the passed variable is an object
     * instance of native PDO class
     * 
     * @see __contruct()
     * @param PDO $connection
     * @throws Exception 
     */
    private function setConnection( $connection ) 
    {

        if ( $connection instanceof PDO ) {
            $this->_connection = $connection;
        } else {
            throw new Exception('<<THIS DEPENDENCY NEEDS A PDO OBJECT>>');
        }
        
    }
    
    /**
     * This method prints the result bar 
     * containg all the available information.
     * You can change the HTML inside the 
     * printf function to fit your needs 
     */
    public function printResultBar() 
    {         
        
        if( $this->getTotalOfResults() > 0 ) { 
           printf("
               <div id=\"result-bar\">
                Showing page <span>%s</span> of <span>
                %s</span> available pages for
                <span>%s</span> 
                results.         
               </div>
                "
               , $this->getCurrentPage()
               , $this->getTotalOfPages()
               , $this->getTotalOfResults()
           );
           
        } else { 
            print "<div id=\"result-bar-not-found\">
               No records were found to your search.</div>"; 
        }     
        
    } 
    
    public function printNavigationBar()  
    { 
        $current_page = $this->getCurrentPage();
        $total_of_pages = $this->getTotalOfPages();
        $paginator = $this->getPaginator();
        $query_string = $this->rebuildQueryString( $paginator );
        $range = $this->getRange();
        
        if($this->getTotalOfResults() > 0) {         
            print "<div id=\"navigation-bar\">"; 
            if ( $current_page > 1 ) { 
                print " <a href=\"?" . $paginator . "=1"  
                        . $query_string 
                        . "\" class=\"first\"  id='page'><span>First</span></a> "; 
                $previous = $current_page - 1; 
                print " <a href=\"?" . $paginator . "=" 
                        . $previous . $query_string 
                        . "\" class=\"previous\" id='page'><span>Previous</span></a> "; 
            } 
             
            for ( 
                $x = ( $current_page - $range ); 
                $x < ( ( $current_page + $range ) + 1 ); 
                $x++ 
            ) { 
                if ( ( $x > 0 ) && ( $x <= $total_of_pages ) ) { 
                    if ( $x == $current_page ) { 
                        print " <span class=\"current\" id='active1'>$x</span> "; 
                    } else { 
                        print " <a href=\"?" . $paginator . "=" . $x 
                              . $query_string . "\" class=\"others\" id='page'>$x</a> "; 
                    } 
                } 
            } 
             
            if ( $current_page != $total_of_pages ) { 
                $next = $current_page + 1; 
                print " <a href=\"?" . $paginator . "=" 
                        . $next . $query_string 
                        . "\" class=\"next\" id='page'>Next</a> "; 
                print " <a href=\"?" . $paginator . "=" 
                        . $total_of_pages . $query_string 
                        . "\" class=\"last\" id='page'>Last</a> "; 
            } 
             
            print '</div>';             
        }     
    }     
    
    /**
     * This method returns the total number of pages
     * @return integer 
     */
    public function getTotalOfPages() 
    {        
        
        return ceil( $this->getTotalOfResults() / $this->getLimitPerPage() );
        
    } 

    /**
     * This method returns the number of the current page
     * 
     * @return int 
     */
    public function getCurrentPage() 
    { 
        $total_of_pages = $this->getTotalOfPages();
        $pager = $this->getPager();
        
        if ( isset( $pager ) && is_numeric( $pager ) ) {          
            $currentPage = $pager; 
        } else { 
            $currentPage = 1; 
        } 

        if ( $currentPage > $total_of_pages ) { 
            $currentPage = $total_of_pages; 
        } 

        if ($currentPage < 1) { 
            $currentPage = 1; 
        } 

        return (int) $currentPage; 
         
    } 
    
    /**
     * This method prepares the offset value for the sql() method
     * 
     * @return int
     */
    private function getOffset() 
    {       
       
        return  ( $this->getCurrentPage() - 1 ) * $this->getLimitPerPage();  
        
    } 
    
    /**
     * This method just validates if a string is passed 
     * 
     * @param string $string
     * @throws Exception 
     */
    public function setSQL( $string ) 
    {
        
        if ( strlen( $string ) < 0 ) {
            throw new Exception( "<<THE QUERY NEEDS A SQL STRING>>" );
        } 
        
        $this->_sql = $string;
        
    }

    /**
     * This method returns the SQL string
     * 
     * @return string
     */
    public function getSQL() 
    {
        $limit_per_page = $this->getLimitPerPage();
        $offset = $this->getOffset();
        
        return $this->_sql .  " LIMIT {$limit_per_page} OFFSET {$offset} "; 
        
    }
    
    /**
     * This method sets the pager other
     * than the one passed in the class declaration 
     */
    public function setPaginator( $paginator ) 
    {
        
        if( !is_string( $paginator ) ) {
            throw new Exception("<<PAGINATOR MUST BE OF TYPE STRING>>");
        } 
        
        $this->_paginator = $paginator;
        
    }
    
    /**
     * This method returns the paginator used to get the pager
     * 
     * @return string 
     */
    private function getPaginator()
    {
        return $this->_paginator;
    }

    /**
     * This method returns the value to paginate
     * 
     * @return type 
     */
    public function getPager() 
    {
        
         return ( isset ( $_REQUEST["{$this->_paginator}"] ) )  
                ? (int) $_REQUEST["{$this->_paginator}"]  
                : 0 
        ;  
        
    }


    /**
     * This method sets the limit of pagination available on the page
     * 
     * @param int $limit
     * @return boolean
     * @throws Execption 
     */
    public function setLimitPerPage( $limit ) 
    {
        
        if( !is_int( $limit ) ) {
            throw new Execption( "<<THE LIMIT MUST BE AN INTEGER>>" );
        }
        
        $this->_limit_per_page = $limit;
        
        
    }

    /**
     * This method returns the availabe pagination limit per page
     * 
     * @return type 
     */
    public function getLimitPerPage() 
    {
        
        return $this->_limit_per_page;
        
    }

    /**
     * This method sets the range of pages to be selected
     * 
     * @param int $range
     * @throws Execption 
     */
    public function setRange( $range ) 
    {
        
        if( !is_int( $range ) ) {
            throw new Execption( "<<THE RANGE MUST BE AN INTEGER>>" );
        }
        
        $this->_range = $range;
        
    }

    /**
     * This method returns the range of pages to be selected
     * from start to end in the pagination menu bar
     * 
     * @return int
     */
    public function getRange() 
    {
        
        return $this->_range;
        
    }
    
    /**
     * This method rebuilds the query string.
     * It's refactored from some code I found on the internet
     * 
     * @param string $query_string
     * @return boolean|string 
     */
    public function rebuildQueryString ( $query_string ) 
    { 
        $old_query_string = $_SERVER['QUERY_STRING'];
        
        if ( strlen( $old_query_string ) > 0 ) { 
            
            $parts = explode("&", $old_query_string ); 
            $new_array = array();
            
            foreach ($parts as $val) { 
                if ( stristr( $val, $query_string ) == false)  { 
                    array_push( $new_array , $val ); 
                } 
            } 
            
            if ( count( $new_array ) != 0 ) { 
                $new_query_string = "&".implode( "&", $new_array ); 
            } else { 
                return false; 
            }
            
            return $new_query_string;
            
        } else { 
            return false; 
        } 
        
    }     

}