<?php if(isset($_POST['post'])) { 
$veri = $_POST['post'];
$cumlex = explode("\n", $veri);
$ksayi =  str_word_count($veri);

$sayi = 0;
  while($sayi != $ksayi) {
      if ($cumlex[$sayi] != '') { 
      $dizi = explode ("*",$cumlex[$sayi]);
   echo 'Mail: '.$dizi[0].'<br>';
   echo 'Şifre: '.$dizi[1].'<br>';
      }
      $sayi++;
}
} ?>
<form method="post" action="">
<textarea name="post"></textarea>
<input type="submit">
</form>