title: PHP Script as Cron Job to Send Email, Prevent Multiple Processes
body: <p>I am developing a reminder application where users can send a email to themselves by selecting time and date for the reminder.</p>
  
  <p>So i would be using cron job for sending the email which will run after every minute and will check if any email is pending to send.</p>
  
  <p>Now, my question is, if at any given time i have 50-100 Emails to send then i think sending email can take more than 1 minute so another cron job will start to run the same script. So will it be any problem ? Is running cron job every minute server resource consuming ? if yes, then what are the other options to achieve same functionality.</p>
  
  <p>Please suggest !!</p>
  
  <p>Thanks</p>