with the search "shuffling an array" you could have found this:
How do I shuffle an array randomly?
Nevertheless, regarding your code, I think there is a problem:
$x = $x > 0 ? $x - 1 : $x;
This will make the chance for a 0 double the chance of any other number.
I wouldn't use splice. I'd go te way of really shuffling the array and then printing it either complete or using the elements in sequence one by one.
For shuffling seethe link I gave above.
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