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CRON Job send email to users in DB?


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If i've got a database of users that have filled out a form, can I use a cron job to send an automated email? If so, what is the best way to "loop" it so that it sends the email once to each user?

 $data = mysql_query("
 FROM completed
 followupsent='0000-00-00 00:00:00'
 AND valuesent + INTERVAL 4 DAY <= NOW()
 or die(mysql_error()); 
 while($info = mysql_fetch_array( $data )) 

This checks to see if "followupsent" has been updated already as it updates with NOW() when it sends and also checks to see how many days since the value was sent.


I'm worried that by putting the email sending information in the while tags is going to loop for each row and end up sending a ton of emails.


Would using

 if($info = mysql_fetch_array( $data )) 

Send out to the first in the database and then the CRON Job handle the rest by checking every minute which one is next?



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