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Digg  putenv
Sets the value of an environment variable
(PHP 4, PHP 5)
Code Examples / Notes » putenvotie
trying to change timezones using putenv: In my case (php 4.2.2) (redhat 2.4.21-1.1931.2.274) TZ does not show up in either the PHP or Linux environment. I'm not sure what the format for TZ is. I tried TZ=EST5EDT. It seemed to work. When I started a session with another browser, it worked there too. Even though I didn't change the environment there.... Hmmm. When I ran the test without the putenv... the date() function would sometimes show CST (my zone), sometimes EST. Every time I reloaded the page, the time would change zones. All times from a database - not time() time. Restoring my TZ=CST didn't help. The times would still switch back and forth. I finally restarted Apache. That worked. The times are now stable. I think the only solution is subtracting (or adding) the appropriate time difference from the time stamp. I wonder what the time functions are looking at. O. jm
The other problem with the code from av01 at bugfix dot cc is that the behaviour is as per the comments here, not there: <?php putenv('MYVAR='); // set MYVAR to an empty value. It is in the environment putenv('MYVAR'); // unset MYVAR. It is removed from the environment ?> av01
Please be aware, that using putenv() does NOT effect the superglobal $_ENV[] variable. If you want to, set it seperately <?php putenv('MYVAR=hello'); assert(getenv('MYVAR') == 'hello'); // passes assert($_ENV['MYVAR'] == 'hello'); // fails! putenv('MYVAR='); // unset, otherwise this will pass when run the next time ?> ericz
Okay, so here's the format that TZ is looking for "America/New_York". You can get all of the timezones from a single file on most unix systems. This code works on all Linux systems that I have seen (various redhat/deb) where you can find this file... And now you have a nice, one level nested timezone list by country. <?php // -- first part, gather all of the zone data $zoneSource = '/usr/share/zoneinfo/zone.tab'; $zoneHandle = fopen($zoneSource, "r"); if (!$zoneHandle) return NULL; //bad file, abort now while (!feof($zoneHandle)) { $zoneLine = ltrim(fgets($zoneHandle, 4096)); if ($zoneLine[0]=='#') continue; //skip comments //Columns... // 1. ISO 3166 2-character country code. // 2. Latitude and longitude of the zone's principal location // 3. Zone name used in value of TZ environment variable. // 4. Comments; present if and only if country has multiple rows. $zoneParts = explode("\t",$zoneLine); //grab parts if (count($zoneParts) < 3) continue; //erroneous line! $nameParts = explode('/', $zoneParts[2], 2); //grab country/name $zoneKey = $nameParts[0]; //country or area $insertArray = &$zoneNames; //where to insert? if (count($nameParts) > 1) { //area/populous if (!isset($zoneNames[$zoneKey])) //not set before $zoneNames[$zoneKey] = array(); $insertArray = &$zoneNames[$zoneKey]; //grab sub (country) $zoneKey = trim($nameParts[1]); //grab correct key } $zoneKey = preg_replace('/[_]/',' ', $zoneKey); $insertArray[$zoneKey] = trim($zoneParts[2]); //actually set data } //end while not eof fclose($zoneHandle); ?> cap
I've been using putenv with PHP 4.3.1 and Apache 2.0.44, but it does not seem to restore variables correctly. I'm getting +0100 and -0800 entries all across my Apache logs. Manually adding a putenv in page footers to restore the original value seems to fix things, but I still wish I could set the time zone for a specific request only. I'm not sure whether using putenv affects all threads within the process, that could be another problem. ericz
I posted some code to help load this file, but it got pruned out by the folks monitoring php.net. Anyway, the format can be loaded from third column of '/usr/share/zoneinfo/zone.tab', available on every Linux platform I've logged into thus far. For NYC, it looks like this: "America/New_York". There are also generic CST/PST but then you have to be careful when daylight savings switches. johnhill
Here is an example of using putenv to change the timezone for the current script. You would have to add a putenv() call to each page in which you wanted to change the timezone. This was posted here about a year ago...I forgot the author's name. He mentioned to "see the zoneinfo directory-tree on your System for a list". This is usually /usr/share/zoneinfo or /usr/lib/zoneinfo. It works in PHP3, not sure about PHP4. //Set the Timezone print("server timezone is: " . getenv('TZ') . " \n"); print("server time is: " . date("H:i:s") . " \n"); print("changing server time zone to US/Pacific.... \n"); putenv("TZ=US/Pacific"); print("new server time is: " . date("H:i:s") . " \n"); print("new server timezone for this script is: " . getenv('TZ')); some Unix servers may use a different format for TZ. Example: putenv("TZ=PST8EDT"); eric z
Hello, actually in answer to your question, I use putenv regularly to control the timezone info. Here's the code that sets both the local environment and SQL to the right timezone. I also use it when running a cvs client through the web. I will post what format it's looking for next. <?php //this isn't the most graceful approach, but if it's set, set the tz if (isset($_SESSION[BEE_PROFILE_TZOFFSET])) { putenv('TZ='.$_SESSION[BEE_PROFILE_TZOFFSET]); //format the timezone for SQL $timeZone = preg_replace('/([+-]\d{2})(\d{2})/', '\'\1:\2\'', date('O')); mysql_query('SET time_zone='.$timeZone); } ?> verkoop
for those who have problems with the putenv ('TZ=Europe/Amsterdam'). I found that there is a solution/work-a-round. It will work, but only if you add mktime(0,0,0,1,1,1970) on the next line. So: putenv ('TZ=Europe/Amsterdam'); mktime(0,0,0,1,1,1970) echo date("H:i:s"); david dot boyce
Environment variables are part of the underlying operating system's way of doing things, and are used to pass information between a parent process and its child, as well as to affect the way some internal functions behave. They should not be regarded as ordinary PHP variables. A primary purpose of setting environment variables in a PHP script is so that they are available to processes invoked by that script using e.g. the system() function, and it's unlikely that they would need to be changed for other reasons. For example, if a particular system command required a special value of the environment variable LD_LIBRARY_PATH to execute successfully, then the following code might be used on a *NIX system: $saved = getenv("LD_LIBRARY_PATH"); // save old value $newld = "/extra/library/dir:/another/path/to/lib"; // extra paths to add if ($saved) { $newld .= ":$saved"; } // append old paths if any putenv("LD_LIBRARY_PATH=$newld"); // set new value system("mycommand -with args"); // do system command; // mycommand is loaded using // libs in the new path list putenv("LD_LIBRARY_PATH=$saved"); // restore old value It will usually be appropriate to restore the old value after use; LD_LIBRARY_PATH is a particularly good example of a variable which it is important to restore immediately, as it is used by internal functions. If php.ini configuration allows, the values of environment variables are made available as PHP global variables on entry to a script, but these global variables are merely copies and do not track the actual environment variables once the script is entered. Changing $REMOTE_ADDR (or even $HTTP_ENV_VARS["REMOTE_ADDR"]) should not be expected to affect the actual environment variable; this is why putenv() is needed. Finally, do not rely on environment variables maintaining the same value from one script invocation to the next, especially if you have used putenv(). The result depends on many factors, such as CGI vs apache module, and the exact way in which the environment is manipulated before entering the script. iavor
Compare to apache_setenv() and apache_getenv(). I had a case setting an env var in VirtualHost which I tried to change with putenv() - but did not work. apache_setenv() worked. povaddict
av01 at bugfix dot cc: "putenv('MYVAR='); // unset, otherwise this will pass when run the next time" it won't pass when run next time, "At the end of the request the environment is restored to its original state." |
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assert_options assert dl extension_loaded get_cfg_var get_current_user get_defined_constants get_extension_funcs get_include_path get_included_files get_loaded_extensions get_magic_quotes_gpc get_magic_quotes_runtime get_required_files getenv getlastmod getmygid getmyinode getmypid getmyuid getopt getrusage ini_alter ini_get_all ini_get ini_restore ini_set main memory_get_peak_usage memory_get_usage php_ini_scanned_files php_logo_guid php_sapi_name php_uname phpcredits phpinfo phpversion putenv restore_include_path set_include_path set_magic_quotes_runtime set_time_limit sys_get_temp_dir version_compare zend_logo_guid zend_thread_id zend_version |
