How to Efficiently Generate Unique Random Numbers Within a Specific Range?

Generating Unique Random Numbers within a Range

Question: How can I efficiently generate unique random numbers within a specified range?

Answer:

The provided code generates random numbers within a range but may not guarantee uniqueness. For an optimized solution, consider the following approaches:

1. Array with Random Order:

• Generate an array of numbers within the range (range(min, max)).
• Shuffle the array using shuffle().
• This creates a random order of numbers, which can be sliced to the desired quantity for unique results.

2. Wrapped Function:

• Encapsulate the array shuffling technique in a function:

function UniqueRandomNumbersWithinRange($min, $max, $quantity) {
    $numbers = range($min, $max);
    shuffle($numbers);
    return array_slice($numbers, 0, $quantity);
}

• Example usage:

print_r(UniqueRandomNumbersWithinRange(0, 25, 5));

Result:

An array of the specified quantity with unique random numbers within the given range.

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