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16 years ago
skeleton of a thread safe updater for an incremental counter:



<?php



$key = "counter";

$value = $memcache->increment($key, 1);

if ($value === false) {

   // --- read from DB ---

   $query = "SELECT value FROM database";

   $result = mysql_query($query);

   $row = mysql_fetch_assoc($result);

   $db_value = $row["value"];

   $add_value = $memcache->add($key, $db_value + 1, 0, 0);

   if ($add_value === false) { 

      $value = $memcache->increment($key, 1)

      if ($value === false) {

          error_log ("counter update failed.");

      }

   } else { 

      $value = $db_value + 1;

   }

}



// --- display counter value ---

echo $value;



?>
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