<?php
function checkNum($num) {
  if($num<10) {
    throw new Exception("Value must be more than 10");
  }
  return true;
}
try {
  checkNum(2);
  // if exception is not thrown 
  echo 'Exception not thrown';
}

//catch exception
catch(Exception $e) {
  echo 'Got You! Exception throw: ' .$e->getMessage();
}
?>

Got You! Exception throw: Value must be more than 10