Write a function named coin_flip that simulates repeatedly flipping a two-sided coin until a particular side (Heads or Tails) comes up several times consecutively (in a row).
Your function should accept two parameters, an integer $k and a character $side, where $side is expected to be 'H' for Heads or 'T' for Tails.
You should keep simulating the flipping of the coin until $k occurrences of the given side are seen consecutively.
For example, if the call is coin_flip(3, 'H'); , you should flip the coin until Heads is seen 3 times in a row.
Here is an example output from the call of coin_flip(4, 'T');
T H T H T T H T T H H T H H H H H T T T T
You got T 4 times in a row!
If a negative $k is passed, and/or a side value is passed that is not 'H' or 'T',
your function should throw an Exception with the message, "Error: k must be non-negative and only sides of H or T allowed".
Use PHP's standard rand($min, $max) function to give an equal chance to a head or a tail appearing
($rand($min, $max) returns a random integer between $min and $max, inclusive).
Each time the coin is flipped, what is seen is displayed (H for heads, T for tails), separated by spaces.
When $k consecutive occurrences of the given side occur, a congratulatory message is printed.
Match our output format exactly.
