Can't save text to a file

I have the following sequence of code:

$fp = fopen('script.sh', 'wt');
fwrite($fp, 'some text');
fclose($fp);

Now this should write some text to script.sh, simple and clear and worked for a while. But since yesterday script.sh is always empty, even though some text is not empty at all. The funny part is that no errors are returned. Also if I type manually something inside script.sh and then run the code script开发者_如何转开发.sh is empty again.

Permissions are 777. The file is correct (if I delete it it says that the file does not exist).

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There is no FOPEN mode 'wt' so it will default to WRITE as defined in the PHP doc:

Open for writing only; 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.

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

Open the file with either APPEND (a) or WRITE (w) mode in order to write data to the file correctly.

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is it 'w+' instead of 'wt'?

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Run out of space and the file could not be saved any more. Works ok now.