Another error

hello
thank you for your report
the script is using the php function tempnam() http://php.net/tempnam
i dont know yet how to prevent this error
what php version are you using ?
is the user www-data have write / read access to this temp folder ?

the problem is not in this module
the problem is in the main module pclzip ( pclzip/pclzip.module on line 95. )

the php version should be >=5.2.1
as you can see in line 95 :

$pclzip_temp_file = tempnam(sys_get_temp_dir(), $filename);

the function is using tempnam and also sys_get_temp_dir() http://php.net/sys_get_temp_dir

the module doesnt define nowhere that the temp dir has to be /tmp, this is automatically done by the php config
but your problem is not saying that the module cannot find the temp dir, the problem looks like a permission problem :
"warning: tempnam(): open_basedir restriction in effect. File(/tmp) is not within the allowed path(s)"

if you want, i can add the ability to add a custom temp folder in the admin options
or
try to replace :

$pclzip_temp_file = tempnam(sys_get_temp_dir(), $filename);

with

$pclzip_temp_file = tempnam(file_directory_temp(), $filename);

thank you for testing, i will update the version to embed this modification

this module is only working for views type node
if you want you can build one for view type file
im waiting for your answer before trying to create one :)