How Can I Efficiently Generate Unique Random Numbers Within a Specific Range?

Generating Unique Random Numbers within a Range: Optimized Approach

To generate unique random numbers within a specified range, consider the following improved methods:

Array with Shuffled Order:

• Create an array with numbers within the desired range.
• Use shuffle() to randomize the order of the array elements.

$numbers = range(1, 20);
shuffle($numbers);

Wrapped Function:

• Define a function that encapsulates the logic for generating a specified number of unique random numbers within a range.
• Within the function, create an array with the desired range, shuffle its order, and return a slice of the array containing the desired number of elements.

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

Example Usage:

$result = UniqueRandomNumbersWithinRange(0, 25, 5);

This will generate and return an array of 5 unique randomly ordered numbers within the range 0-25.

Sample Result:

$result = [14, 16, 17, 20, 1]

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