改变

$fp = @fopen($target_filename,"wt");

至

$fp = fopen($target_filename,  a );  

您可以找到参考资料HERE…当使用a时，意味着附加…当文件不存在时，此函数将强制创建。。。

希望它能有所帮助！

您可以使用以下代码：

<?php 
    $target_filename = "testFile.txt";
    $fh = fopen($target_filename,  r );
    $theData = fread($fh, filesize($target_filename));

    $fh = fopen($target_filename,  w ) or die("can t open file");
    $message = $theData."
";
    foreach ($_POST as $key => $value)
    $message .= "$key: $value
";

    //Put the date in
    $message .= date("F j, Y, g:i a");
    fwrite($fh, $message);
    fclose($fh);
    ?>

Hope it works. Thanks

以append模式打开文件：

$fp = fopen($target_filename,  a );

您也可以简单地使用file_put_contents（）：

file_put_contents($target_filename, $message, FILE_APPEND);

接受此fopen（）函数或您可以使用php手册……使用此

// This just names the file
$target_filename = "usersubmit_f456sd4f56sd4f.txt";

// Create an empty buffer
$message = "";

// This gets all the form keys (names) and values
foreach ($_POST as $key => $value)
$message .= "$key: $value
";

// Put the date in
$message .= date("F j, Y, g:i a");

// Open the file and write it out
$fp = fopen($target_filename,  a ); 
if ($fp != NULL) 
{
fputs($fp,$message);
fclose($fp);
}

a：追加。打开并写入文件末尾，如果不存在则创建新文件

Modes   Description
r   Read only. Starts at the beginning of the file
r+  Read/Write. Starts at the beginning of the file
w   Write only. Opens and clears the contents of file; or creates a new file if it doesn t exist
w+  Read/Write. Opens and clears the contents of file; or creates a new file if it doesn t exist
a   Append. Opens and writes to the end of the file or creates a new file if it doesn t exist
a+  Read/Append. Preserves file content by writing to the end of the file
x   Write only. Creates a new file. Returns FALSE and an error if file already exists
x+  Read/Write. Creates a new file. Returns FALSE and an error if file already 

改为尝试

<?php
$file =  usersubmit_f456sd4f56sd4f.txt ;
// The new person to add to the file
 $person = "John Smith
";
// Write the contents to the file, 
// using the FILE_APPEND flag to append the content to the end of the file
// and the LOCK_EX flag to prevent anyone else writing to the file at the same time
file_put_contents($file, $person, FILE_APPEND | LOCK_EX);
?>

文件输出内容

此函数与依次调用fopen（）、fwrite（）[/code>和fclose（）将数据写入文件相同