Hello.
I don't understand it at all. I'm trying to cache some data in a shared
memory segment with PHP 4.0.4pl1's shm functions.
I do this like this:
<?php
$key["shm"] = 0x4711;
$key["var"] = 0x0815;
$file = "services";
$size = filesize( $file );
$fd = fopen( $file, "r" );
$data = fread( $fd, $size );
fclose( $fd );
$magic_size_shm = 42; /********* ?????????????? WHY ????????? *********/
$size_data = strlen( $data );
$size_shm = strlen( serialize( $data ) ) + $magic_size_shm;
$shm = shm_attach( $key["shm"], $size_shm );
$data_shm = @shm_get_var( $shm, $key["var"] );
if( ! $data_shm ){
shm_put_var( $shm, $key["var"], $data );
$data_shm = shm_get_var( $shm, $key["var"] );
}
shm_detach( $shm );
?>
What I don't understand at all is, why I need to add this "$magic_size_shm"
to the "strlen( serialize( $data ) )" value. The value I need to add seems
to be always between 41 and 49, but it varies depending on the data I want
to store.
According to the manual and the comments there, I'd have thought that it is
enough to just alloc "strlen( serialize( $data ) )" - why is that not so?
Now, before someone suggest to try shmop instead - this is not working at
all. I've tried the example from the shmop manual page on php.net, and this
totally breaks. These lines don't work at all on my system:
$shm_size = shmop_size($shm_id);
echo "SHM Block Size: ".$shm_size. " has been created.\n";
For my system, it returns totally varying values which are all WAY below 0,
like -1072562176, or -722337792 or -914554880 .... Because of that, PHP
cannot access the shmop segment.
This is on a current Mandrake Cooker (beta) system with glibc 2.2.2, kernel
2.4.2 (also tried 2.4.3). PHP was compiled with gcc 2.96.
Someone please help me!
Alexander Skwar
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