How to check if memcache or memcached is installed for PHP

Question

How do I test if memcache or memcached  for PHP  is installed on my Apache webserver      Memcache is a caching daemon designed especially for   dynamic web applications to decrease database load by   storing objects in memory

User · Answer

It may be relevant to see if it s running in PHP via command line as well-   lt path-to-php-binary gt php -i   grep memcache

User · Answer

You can look at phpinfo   or check if any of the functions of memcache is available  Ultimately  check whether the Memcache class exists or not   e g   if class exists  Memcache          Memcache is enabled

User · Answer

You have several options      memcache enabled   class exists  Memcache     memcache enabled   extension loaded  memcache     memcache enabled   function exists  memcache connect

User · Answer

this is my test function that I use to check Memcache on the server   lt  php      public function test             memcache test - make sure you have memcache extension installed and the deamon is up and running      memcache   new Memcache       memcache- gt connect  localhost   11211  or die   Could not connect          version    memcache- gt getVersion        echo  Server s version     version   lt br  gt  n         tmp object   new stdClass       tmp object- gt str attr    test        tmp object- gt int attr   123        memcache- gt set  key    tmp object  false  10  or die   Failed to save data at the server        echo  Store data in the cache  data will expire in 10 seconds  lt br  gt  n         get result    memcache- gt get  key        echo  Data from the cache  lt br  gt  n        var dump  get result        if you see something like this       Server s version  1 4 5 4 gaa7839e     Store data in the cache  data will expire in 10 seconds      Data from the cache      object stdClass  3  2      str attr    gt  string 4   test    int attr    gt  int 123      it means that everything is okay  Cheers

User · Answer

The best approach in this case is to use extension loaded   or function exists   they are equally as fast   You can see evidence here   https   github com dragoonis ppi-framework blob master Cache Memcached php L140  Bear in mind that some PHP extensions such as APC have php ini settings that can disable them even though the extension may be loaded  Here is an example of how to check against that also   https   github com dragoonis ppi-framework blob master Cache Apc php L79  Hope this helps

User · Answer

I combined  minified and extended  some more checks  the answers from  Bijay Rungta and  J C  Inacio   lt  php if  extension loaded  Memcache          die  Memcache extension is not loaded       if   class exists  Memcache           die  Memcache class not available        memcacheObj   new Memcache  if   memcacheObj        die  Could not create memcache object       if    memcacheObj- gt connect  localhost           die  Could not connect to memcache server          testdata to store in memcache  testData   array       the    gt   cake        is    gt   a lie          set data  if not present   aData    memcacheObj- gt get  data    if    aData         if   memcacheObj- gt set  data    testData  0  300                 die  Memcache could not set the data                try to fetch data  aData    memcacheObj- gt get  data    if    aData         die  Memcache is not responding with data       if  aData      testData        die  Memcache is responding but with wrong data       die  Memcache is working fine

User · Answer

Use this code to not only check if the memcache extension is enabled  but also whether the daemon is running and able to store and retrieve data successfully    lt  php if  class exists  Memcache           server    localhost       if   empty   REQUEST  server                server     REQUEST  server               memcache   new Memcache       isMemcacheAvailable     memcache- gt connect  server        if   isMemcacheAvailable             aData    memcache- gt get  data            echo   lt pre gt            if   aData                echo   lt h2 gt Data from Cache  lt  h2 gt                print r  aData             else                aData   array                   me    gt   you                    us    gt   them                              echo   lt h2 gt Fresh Data  lt  h2 gt                print r  aData                memcache- gt set  data    aData  0  300                      aData    memcache- gt get  data            if   aData                echo   lt h3 gt Memcache seem to be working fine  lt  h3 gt              else               echo   lt h3 gt Memcache DOES NOT seem to be working  lt  h3 gt                      echo   lt  pre gt            if    isMemcacheAvailable        echo  Memcache not available        gt

User · Answer

why not use the extension loaded   function

User · Answer

I know this is an old thread  but there s another way that I ve found useful for any extension   Run  php -m   grep  lt module name gt   In this particular case   php -m   grep memcache  If you want to list all PHP modules then   php -m  Depending on your system you d get an output similar to this    PHP Modules  apc bcmath bz2     lots of other modules     mbstring memcache      and still more modules     zip zlib   Zend Modules    You can see that memcache is in this list

User · Answer

Note that all of the class exists  extensions loaded  and function exists only check the link between PHP and the memcache package    To actually check whether memcache is installed you must either    know the OS platform and use shell commands to check whether memcache package is installed or test whether memcache connection can be established on the expected port    EDIT 2  OK  actually here s an easier complete solution   if  class exists  Memcache           memcache   new Memcache       isMemcacheAvailable     memcache- gt connect  localhost      if   isMemcacheAvailable                    Outdated code below    EDIT  Actually you must force PHP to throw error on warnings first  Have a look at this SO question answer   You can then test the connection via   try        memcache- gt connect  localhost      catch  Exception  e           well it s not here

[php] How to check if memcache or memcached is installed for PHP?

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