codice:
<?php
 
 function prog()
 {
  $file=fopen("testoscritto.txt","r");
  flock($file,2);
   while (!feof($file))
		{
  		 $linea=fgets($f,80);
		 echo "riga: $linea 
";
		}
  flock($file,3);		
  fclose($file);
 }
 ?>
<html

<head>
<title>Programma php</title>	 
</head>
 
<body>
<? if ($_POST['mostra']==1)
  {
prog();
  }else {?>
        <form method="POST">
<input type="hidden" value="1" name="mostra">
         <input type="submit">
        </form>		 
  <?}?>
       </body>
 
</html>