retrieve random content from a string indexed associative array PHP

retrieve random content from a string indexed associative array PHP

I am trying to retrieve a random array from a string indexed associative
array. The code is as follows and I keep encountering errors:
$suite['heart']=1;
$suite['heart']=2;
$suite['heart']=3;
$suite['heart']=4;
$suite['heart']=5;
$rand = array_rand($suite);
$card1 = $suite[$rand];
print $card1;
My results have been static and continuously displaying number 5, I want
it to display any of the random numbers.
Thank you in advance!