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Random Array Element in PHP

Given an array:

<?php
	$arr = ['a' => 1, 'b' => 2, 'c' => 3];
?>

Display a random key from this array.

Given an array:

<?php
	$arr = ['a' => 1, 'b' => 2, 'c' => 3];
?>

Display a random element of this array.