Overwrite file on server (PHP)

Question

I am making an Android application that need to be able to push files onto a server.

For this I'm using POST and fopen/fwrite but this method only appends to the file and using unlink before writing to the file has no effect. (file_put_contents has the exact same effect)

This is what I have so far

<?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.

Anyone got any suggestions on overwriting the file contents?

Thanks, Luke.

Unwary

No way this could be happening. fopen in w mode is "open file, truncate to zero length". If it was appending, you'd have to be opening in a mode – Aisha

Answer 1

Use wa+ for opening and truncating:

$file = fopen($savePath,"wa+");

fopen

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.

Leclair

You must be doing something wrong. As the manual says: it truncates to 0 length. – Leclair

i was using string = string + newString and forgetting to call string = "" before clicking save a second time so it was just adding the new ones on each time – Unwary

Answer 2

file_put_contents($savePath,$fileContent);

Will overwrite the file or create if not already exist.

Einsteinium

Answer 3

read this it will help show all the options for fopen

http://www.php.net/manual/en/function.fopen.php

Cheyennecheyne

Answer 4

Found the error, i forgot to reset a string inside of my application

Unwary