<?php
#Class cronjobs externo
#Alan Cordeiro
#3/04/2010

@Banco de Dados:
/*
CREATE TABLE IF NOT EXISTS `urls` (
  `id` int(12) NOT NULL AUTO_INCREMENT,
  `url` varchar(512) NOT NULL,
  `time` int(128) NOT NULL,
  `next` int(128) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
*/

@Exemplo Inserir Tarefas:
/*
<?php
$cron = new cronjobs;
$cron->insertUrl($_POST['url'],$_POST['intervalo']);
?>
*/

class cronjobs{

    private $dbuser = 'root';
    private $dbpass = '';
    private $bd     = 'cronjobs';


public function __construct(){
        $sql = mysql_connect('localhost',$this->dbuser, $this->dbpass)or die(mysql_error());
        mysql_select_db($this->bd,$sql)or die(mysql_error());
        $this->sql = $sql;
    }

public function insertUrl($url,$time){
        $searchUrl = mysql_query("SELECT url FROM urls WHERE url='".$url."'",$this->sql);
        if(mysql_num_rows($searchUrl) == null){
            $next = date('i',time()+($time*60));
            mysql_query("INSERT INTO urls (url,time,next) VALUES('".$url."','".$time."','".$next."')",$this->sql);
        }else{
            mysql_query("UPDATE urls SET time='".$time."' WHERE url='".$url."'",$this->sql);
        }
    }

public function exec(){
        $searchUrl = mysql_query("SELECT * FROM urls WHERE next='".date('i')."'",$this->sql);
        while($row = mysql_fetch_array($searchUrl)){
            if(date('i') == $row['next']){
                $next = date('i',time()+($row['time']*60));
                mysql_query("UPDATE urls SET next='".$next."' WHERE url='".$row['url']."'",$this->sql);
                $curl = curl_init();
                curl_setopt($curl,CURLOPT_URL,$row['url']);
                curl_setopt($curl,CURLOPT_FOLLOWLOCATION, true);
                curl_exec($curl);
            }
        }
    }
}
?>