mysqli_query($link, "INSERT INTO `" . $name_table . "` (`login` , `password`, `email`) VALUES ('$login','$password','$email')") or die("Ошибка " . mysqli_error($link));
<form>
<div class="input2">
<input class="input1" name="input1"/>
<input class="input1" name="input2"/>
<input class="input1" name="input3" readonly />
<div>
</form>
<form>
<div class="input2">
<input class="input1" name="input1"/>
<input class="input1" name="input2"/>
<input class="input1" name="input3" readonly />
<div>
</form>
<form>
<div class="input2">
<input class="input1" name="input1"/>
<input class="input1" name="input2"/>
<input class="input1" name="input3" readonly />
<div>
</form>