php编辑和保存文件

save_file.php
<?php 
session_start(); 
$handle = fopen($_POST['original_file_name'], "w"); 
$text  = $_POST['file_contents']; 
if(fwrite($handle, $text) == FALSE){ 
    $_SESSION['error'] = '<span class="redtxt">There was an error</span>'; 
}else{ 
    $_SESSION['error'] = '<span class="redtxt">File edited successfully</span>'; 
} 
fclose($handle); 
header("Location: ".$_POST['page']); 
?>

read_file.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
</head>
<form action="savecontents.php" method="post">
<textarea name="file_contents" style="width:700px;height:600px;">
<?php 
$fileName = "location/of/orignal/file/my_file.php"; 
$handle = fopen($fileName, "r"); 
while (!feof($handle)){ 
    $text = fgets($handle); 
    echo $text; 
} 
?> 
</textarea>
<input type="hidden" value=" <? echo $fileName; ?> " name="original_file_name" />
</form>
<body>
</body>
</html>
//该代码片段来自于: http://www.sharejs.com/codes/php/1940