Completed highlow.php exercise

Make a Higher or Lower number guessing game that prompts the user to
guess a number between 1 and 100. Generate a random number as the
answer and tell the user if they need to guess HIGHER or LOWER until
they are correct. When correct, tell them GOOD GUESS!
Completed Step 2 of highlow.php exercise

Use mt_rand() instead of rand() to generate a better random number.
Completed Step 3 of high low.php exercise

Count and display the number of tries it took the player to guess the
number.