2 submit-buttony

<form action="stranka1.php">
  <input type="text" name="input">
 
  <input type="submit" name="subm1">
  <input type="submit" name="subm2">
</form>

<form method="post" action="stranka.php">
<input type="text" name="text">
<input type="submit" name="sbm" value="1">
<input type="submit" name="sbm" value="2">
</form>

stranka.php

<?php
$text = $_POST['text'];
$submit = $_POST['sbm'];
if ($submit==1){
echo "stranka1";
}else{
echo "stranka2"
}
?>

<form action="1.php" method="post" id="form" name="form">
<input type="text" name="bla" />
<input type="button" value="odoslatdo1" onclick="document.getElementById('form').action='1.php';document.form.submit()" />
<input type="button" value="odoslatdo2" onclick="document.getElementById('form').action='2.php';document.form.submit()" />
</form>

<?php
if($_POST) {
   if(isset($_POST['preview'])) {
      include("stranka1.php");
   } elseif(isset($_POST['post'])) {
      include("stranka2.php");
   }
}
?>
<form method="post">
<input type="text" name="text">
<input type="submit" name="preview" value="Nahlad">
<input type="submit" name="post" value="Odoslat">
</form>