Posted on: October 29, 2009 at 12:00 AM
Syntax
bool flock
(
file_name ,lock
[,block] )
- It puts the locks on the file or remove the lock
- It is used for the simple reader/writer file model
lock values are
- LOCK_SH - It is Shared lock for reader. Other processes can access the file.
- LOCK_EX - It is Exclusive lock for writer. It doesn't allow other processes to access the file
- LOCK_UN -It releases a shared or exclusive lock
- LOCK_NB - It doesn't block other processes when the file has lock
Example of PHP Flock() Function
Code for flock() function PHP
<?php
$file = fopen("c:/rose1/ram.txt","w+");
if (flock($file,LOCK_SH))
fwrite($file,"India
is a great country");
else
echo "locking
problem in file";
?>
Output
ram.txt is not cotaining any thing as LOCK_SH makes the lock for
reader and
doesn't allow for writing
Code
<?php
$file =
fopen("c:/rose1/ram.txt","w+");
if (flock($file,LOCK_EX))
fwrite($file,"India
is a great country");
else
echo "locking
problem in file";
?>
Output
now ram.txt has India is a great country
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