在其中发送电子邮件和短信时，Foreach循环迭代问题

I am running a PHP function regularly with support of WGET linux command (like CRON). In this case, for every execution, I will take 1500 records from my database, and iterate through foreach loop. Inside the foreach, I need to run a for loop with limit of 20 iterations. Inside the for loop, I will check the current action using switch case.

$samplearray = array('.....'); // Multidimensional array contains 1500 rows
foreach($samplearray as $samplearr)
{
     for($s=1;$s<=20;$s++)
     {
          $step = mysql_query("SELECT steptype FROM steptable WHERE camapign=$samplearr['campaign'] AND currentstep=$s")or die(mysql_error());
          $stepdet = mysql_fetch_array($step);
          switch($stepdet ['steptype'])
          {
               case 'email':
                   // PHP mailer script to send emails
               break;
               case 'sms':
                   // Third party URL to send SMS using Curl execution
               break;
               case 'others':
                   // DB updations - Mysql Query
               break;
               // DB updations - Mysql Query
          }
     }
}

Here, the problem is, if the case contains 'email' or 'sms', duplicates are sending.

For e.g. in 1500 iterations, more than 2500 emails are sent. I don't know where the problem occurs.

Thanks in advance.