Overwriting contents of file

[Anon]

hi,
How to overwrite contents of file.

i.e.
I want to
1. Read the entire file in $data.
2. Lock the file.
3. Manupulate the $data.
4. Write back manupulated $data to file.
5. release the lock
6. Close the file.

i.e if file contains "abcdxyz",
I want to make it "abcdpqrstxyz", without releasing lock after reading.

Regards,
Chaitanya

[Anon]

1.
$fname = "blah.ext";
$fp = fopen($fname,"w+") or die("Unable to open");
$data = fread($fp,filesize($fnam));
2.flock($fp,2) or die("Unable to lock");
3. $data = substr($data,0,4)."pqrst".substr($data,4);
4. $fwrite($fp,$data) or die("Unable to write");
5. $flock($fp,3) or die("Unable to release");
6. $fclose($fp) or die("Unable to close");

Please check the filesystem compatibility for flock functionality.

Hope this helps, good luck