覆盖服务器上的文件 (PHP)
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Overwrite file on server (PHP)
提问by Luke Pring
I am making an Android application that need to be able to push files onto a server.
我正在制作一个需要能够将文件推送到服务器的 Android 应用程序。
For this I'm using POSTand fopen/fwritebut this method only appends to the file and using unlinkbefore writing to the file has no effect. (file_put_contentshas the exact same effect)
为此，我正在使用POSTandfopen/fwrite但此方法仅附加到文件，并且unlink在写入文件之前使用无效。（file_put_contents具有完全相同的效果）
This is what I have so far
这是我到目前为止
<?php
$fileContent = $_POST['filecontent'];
$relativePath = "/DatabaseFiles/SavedToDoLists/".$_POST['filename'];
$savePath = $_SERVER["DOCUMENT_ROOT"].$relativePath;
unlink($savePath);
$file = fopen($savePath,"w");
fwrite($file,$fileContent);
fclose($file);
?>
The file will correctly delete its self when I don't try and write to it after but if I do try and write to it, it will appended.
当我之后不尝试写入文件时，该文件将正确删除其自身，但如果我尝试写入文件，它将被附加。
Anyone got any suggestions on overwriting the file contents?
有人对覆盖文件内容有什么建议吗？
Thanks, Luke.
谢谢，卢克。
回答by putvande
Use wa+for opening and truncating:
使用wa+开启和截断：
$file = fopen($savePath,"wa+");
w+: Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
a+: Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it.
w+: 可读写；将文件指针放在文件的开头并将文件截断为零长度。如果该文件不存在，请尝试创建它。
a+: 开放读写；将文件指针放在文件末尾。如果该文件不存在，请尝试创建它。
回答by andrew
file_put_contents($savePath,$fileContent);
Will overwrite the file or create if not already exist.
如果文件不存在，将覆盖文件或创建。
回答by user583576
read this it will help show all the options for fopen
阅读这将有助于显示 fopen 的所有选项
回答by Luke Pring
Found the error, i forgot to reset a string inside of my application
发现错误，我忘了在我的应用程序中重置一个字符串
