Re: File Locking in PHP.

On Tue, 20 Feb 2001 08:50, Matthew Toledo wrote: > Hello, I am just starting to use PHP. I have been using PERL for quite > some time. I was wondering if there is any specific FILE LOCKING I > need to implement to keep more than one person from altering a text > file at the same time. > > For instance, in PERL, you use the flock command to set up an advisory > file lock. Lets say that if I have a web page with a text based > database, and more than one person wants to write to the file at the > same time. In perl, if you use flock(FILE, 2). This causes person A > to wait while person B writes to the file. flock(FILE, 8) unlocks the > file. Then person A is allowed to write to the file. > > Does the perl equivalent of flock happen automatically in PHP? > > If not, how do you lock a file? > > Is it an advisory lock, or will it cause an error if two people try to > access the same file at the same time for the same purpose (writing). > > Thanks, The flock() function in PHP seems to do pretty much what you are looking for - it allows setting a shared or exclusive lock and you can control blocking while locking (at least according to the manual!) -- David Robley | WEBMASTER & Mail List Admin RESEARCH CENTRE FOR INJURY STUDIES | http://www.nisu.flinders.edu.au/ AusEinet | http://auseinet.flinders.edu.au/ Flinders University, ADELAIDE, SOUTH AUSTRALIA