<?php
// Log(10, number)

function countLog($number, &$errors_count){
  try{
    if ($number <= 0){
      $errors_count++;
      throw new Exception("Error. Number should be bigger than 0 \n");
    }
    $errors_count = 0;
    $number = log10($number);
  }
  catch(Exception $err){
    echo $err->getMessage();
  }
  finally{
    return $number;
  }
}
function solveTasks(){
  $number_of_tasks = random_int ( 20 , 30 );
  $max_try_limit = 3;
  $errors_in_row = 0;
  for ($i = 0; $i < $number_of_tasks; $i++){
    $number = random_int ( -100 , 50 );
    echo "Let's count log(10," , $number , ") \n";
    $number = countLog($number, $errors_in_row);
    echo "Result is ", $number, " \n";
    if ($errors_in_row > $max_try_limit){
      echo "You tried to count log ", $errors_in_row, " times. Something is going wrong";
      return false;
    }
  }
  echo "Done. Everything is ok";
}
solveTasks();