Re: File locking with PHP functions

On Monday, 4 April 2011 at 15:28, Paul M Foster wrote: I'd like to know (from someone who knows the internals more than I do) > whether the following functions lock files and to what extent: > > fopen($filename, 'w'); > > Does this function lock the file from writes until fclose()? > Does it lock from reads as well? > > fopen($filename, 'r+'); > > Does this function lock the file from writes until fclose()? > Does it lock the file from reads as well? > > file($filename); > > Does this function lock the file from writes until finished? > Does it lock the file from reads as well? > > All this is in the context of a Linux/Unix web server. No, fopen does not lock the file. Check out http://php.net/flock but be sure to read all of that page because there are some gotchas with using it. -Stuart -- Stuart Dallas 3ft9 Ltd http://3ft9.com/