Question

I’ve tried generating the complete set of timezones as specified in http://php.net/manual/en/timezones.php (except UTC) by using the following code:

$zones = timezone_identifiers_list();

print_r($zones);

But this list seems to skip ~ 50 regions, eg: Pacific/Samoa (as compared to http://php.net/manual/en/timezones.php)

What are we doing wrong?

phpinfo() shows:

PHP Version 5.3.4
Apache Version  Apache/2.2.3 (CentOS) 

$ uname -r
2.6.18-028stab070.14

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Edit #2

date
date/time support   enabled
"Olson" Timezone Database Version   0.system
Timezone Database   internal
Default timezone    UTC 

Answer 1

Your timezone database might not be up-to-date.

Try following the link at the bottom of the List of Supported Timezones page :

The latest version of the timezone
database can be installed via PECL’s »
timezonedb.

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Edit after the comments : to update your timezone database, as you are on a Linux system, you can use the pecl command (I just tried this on my Ubuntu machine) :

pecl upgrade timezonedb

This will download the new version, and compile it.

Then, if you enable the new timezonedb extension, your PHP should use an uptodate database :

php -dextension=timezonedb.so -i | grep Timezone
"Olson" Timezone Database Version => 2011.5
Timezone Database => external
Alternative Timezone Database => enabled
Timezone Database Version => 2011.5

If I try without enabling that new extension, I get the same kind of thing you had before :

php -i | grep Timezone
"Olson" Timezone Database Version => 0.system
Timezone Database => internal