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.