thanks for your answers.i could solve my problem with this code.hope help other guys.
$text = $row["your html text from database row"];
preg_match('/< *img[^>]*src *= *["\']?([^"\']*)/i', $text, $img);
$pics=$img[1];
output is ($pics)= ( images/akhbar/5/q103.jpg )
solved How to get image URL within HTML tags?