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mysql connection that re-connects if it's been disconnected

/ Published in: PHP
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usage is simple:
$result = mysqli_query($query,db_conn('local')); for instance.
if written in patterns, this should probably be a singleton, but I haven't bothered converting it - feel free to comment with your modification though!

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  1. $local = false;
  2. $master = false;
  3. $host = array('local'=>'localhost','master'=>'192.168.1.1');
  4. function db_conn($type)
  5. {
  6.         global $local,$master,$host;
  7. //      echo 'in db_conn';
  8.         if(${$type} && ${$type}->ping())
  9.         {
  10. //              echo 'connection already exists and is alive';
  11.                 return ${$type};
  12.         }
  13.         else
  14.         {
  15. //              echo 'connection does not exist, attempting to connect';
  16.                 ${$type} = new mysqli($host[$type],'user','password','database');
  17.                 if(${$type})
  18.                 {
  19.                         return ${$type};
  20.                 }
  21.                 else
  22.                 {
  23.                         err('Could not connect to '.${$type}.' database.'.mysqli_connect_error());
  24.                         return false;
  25.                 }
  26.         }
  27. }

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