How can the usage of array_rand() affect the performance of a PHP script within a while() loop?

Using array_rand() within a while() loop can affect the performance of a PHP script because array_rand() generates a random key each time it is called, which can be computationally expensive. To improve performance, it is better to generate the random key outside the loop and then access the array element using that key within the loop.

// Generate random key outside the loop
$randomKey = array_rand($array);

// Use the random key within the while loop
while ($condition) {
    $value = $array[$randomKey];
    // Other loop operations
}