Ryan A wrote:
Hey,
Heres my setup, I have a directory full of files and I
get a request with an array of filenames
For this example:
a.txt
b.txt
c.txt
if the above files dont already exist I need to create
them (I am using touch() instead of fopen())
My question is which would you recommend, doing a
readdir() and getting all the existing filenames in an
array then doing a loop to see which exists and create
the others OR
just taking the new filenames, doing a while/for loop
with a files_exists() on each and then creating the
files....
I am favouring the second approach as in the first
approach there are a lot of files the array could be
pretty big which would cause other problems, but I
would rather be corrected now if my thinking is
flawed.
It depends on:
--the number of files in the directory
--the the number of files being added/updated
--the liklihood that a file in the request will be new
Here are a couple of general principles to follow:
--KISS. Start with the simplest solution. Complicate it only to optimize
it and then only if optimization is really necessary.
--A system call is relatively expensive and time-consuming.
If you are literally only touching the files that don't exist (to create
an empty file), consider building a shell script that does the whole
batch in one system call.
--John
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