Questions about flock in PHP

For questions about flock in PHP and about flock, I wrote a blog on http://www.shionco.com/archives/php_flock.htmlexample code : ?fd=fopen ('. /a.html ', 'WB'); & nbsp; & n questions about flock in PHP
On the flock question, I am on the blog overall, http://www.shionco.com/archives/php_flock.html

Routine code:

$ Fd = fopen ('./a.html', 'WB ');
If ($ fd ){
If (@ flock ($ fd, LOCK_EX | LOCK_NB )){
Echo 'The unlocked, open the file and lock it ';
Sleep (10 );
} Else {
Print 'locked, close file ';
}
Fclose ($ fd );
} Else {
Echo 'failed to open the file ';
}

Under FF, I created two pages to open the first page for operation. the exclusive lock was successful, and the latency status was displayed. I immediately opened 2nd pages for operation. as a result, page 2nd was blocked, when the 1st page is finished, the 2nd page is locked exclusively and enters the delayed status. after the execution is completed, LOCK_NB is clearly used, but no exclusive lock failure occurs. A new tab or window is blocked!

However, in IE (I am using IE9 but not tested), the 2nd page exclusive lock fails, and the output "locked, Close File ";

If so, will the FF client block a lot of browsing cached files with content updates?



------ Solution --------------------
You can perform this verification and create another file containing the above code.

Try to open these two files in a label-based browser to see if they meet your needs .. If yes, this is the reason