<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

for($count = 3; $count <= 2000; $count++) {
$sql = "INSERT INTO tablo_adiniz (resim, modelno, sef)
VALUES ('resim_linki_buraya', ".str_pad($count, 4, "0", STR_PAD_LEFT).", '".str_pad($count, 4, "0", STR_PAD_LEFT)."')";
$conn->exec($sql);

}
} catch(PDOException $e) {
echo $sql . "<br>" . $e->getMessage();
}

$conn = null;
?>