<?php
$cfg = parse_ini_file("cfg.ini", true);
class db
{
    public $path;
    public $way;
        function __construct($cfg)
        {
                $this->name = $cfg['DB']['username'];
                $this->password = $cfg['DB']['password'];
                $this->dbname = $cfg['DB']['dbname'];
                $this->dhcp = $cfg['DHCP']['path'];
        }
        function connect()
        {   global $dbconn;
            $dbconn = pg_connect("host=localhost dbname=$this->dbname user=$this->name password=$this->password");
        }
        function select($what,$where)
        {
            $query = 'SELECT '.$what.' FROM '.$where.'';
            $result=pg_query($query);
            $arr = pg_fetch_all($result);
            print_r($arr[0]) ;
        }
        function dhcp($file,$i)
        {
                $a=strpos($file[$i],","); //В данную переменную положил порядковый номер запятой
                $b=substr($file[$i],0,$a); // Обрезал строку до запятой,что бы получить имя ключа
                return $b;
        }
        function dhcp_num()
        {
            global $file;
            $file =file($this->dhcp);
            $string=count($file =file($this->dhcp));
            return $string;
        }
}

$app=new db($cfg);
$app->connect();
//$app->select("idcomputer","computer");
//pg_close($dbconn);
//$app->dhcp();
//echo $app->dhcp_num();
//echo $app->dhcp($file,0);
$i=0;
while ($i<($app->dhcp_num()))
{
    $q=$app->dhcp($file,$i);echo "\n";
    $i=$i+1;
    $c=$app->select("cert=$q","computer");
    echo "$c\n";
}
?>