On Mon, 2006-08-14 at 18:35 -0400, Adam Zey wrote:
>
> Further experimentation shows that the problem only occurs if the
> variable being count'd is a static variable inside a function. Of
> course, the original point still stands, static or no, count shouldn't
> make a copy. Here is a sample script that I can confirm reproduces the
> issue:
>
> <?php
>
> use_mem();
>
> function use_mem()
> {
> static $foo = "";
>
> for ( $x=0; $x <= 70000; $x++ )
> $foo[] = "BwaHA" . mt_rand(0, 1000000);
>
> echo memory_get_usage();
> $numrows = count($foo);
> }
>
> ?>
>
> PHP's default memory limit is 8MB. This script creates an array that's
> about 5.5MB. That part's fine. But it fails on that last line with the
> count($foo).
>
> I realize that this particular function doesn't need the variable to be
> static, but it's just a demonstration. My actual script had a function
> that needed some data to be read in from a file into an array. Rather
> than reading it in in the main script and passing it to the function, or
> having the function read the data in every execution, I simply made
> the variable static and had the function check if the variable was empty
> to see if it was the first time the function had been called.
>
> Sorry for not realizing that the static variable is the key to
> reproducing this issue. Does the script that I've pasted here give you
> any better luck in reproducing?
Yep looks like a bug or a design choice based on static variables. I'm
not sure what the reasoning is, but it sounds like static vars currently
take a huge performance hit when containing large chunks of memory :/ I
just tested your code using is_array() and got the same failure.
Cheers,
Rob.
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