How to create a Set of size N in PHP - Step by Step Examples

How to create a Set of size N in PHP ?

Answer

To create a set of size N in PHP, you can use a loop to add elements to an array until it reaches the desired size, then convert the array to a set using the array_flip function.


✐ Examples

1 Create a Set of Size N with Sequential Numbers

In this example,

  1. We define a function named createSetOfSizeN that takes an integer n as a parameter. This parameter represents the desired size of the set.
  2. Inside the function, we initialize an empty array named array.
  3. We use a for loop to add integers from 1 to n to the array.
  4. We convert the array to a set using the array_flip function, which swaps the keys with their associated values.
  5. The function returns the created set.
  6. We call createSetOfSizeN with a specific size (e.g., 5) and store the result in a variable named mySet.
  7. Finally, we print the created set to the console using print_r.

PHP Program

<?php
function createSetOfSizeN($n) {
    $array = [];
    for ($i = 1; $i <= $n; $i++) {
        $array[] = $i;
    }
    return array_flip($array);
}

$mySet = createSetOfSizeN(5);
print_r($mySet);
?>

Output

Array
(
    [1] => 1
    [2] => 2
    [3] => 3
    [4] => 4
    [5] => 5
)

2 Create a Set of Size N with Random Numbers

In this example,

  1. We define a function named createRandomSetOfSizeN that takes an integer n as a parameter. This parameter represents the desired size of the set.
  2. Inside the function, we initialize an empty array named array.
  3. We use a while loop to add random numbers to the array until it reaches the desired size.
  4. We convert the array to a set using the array_flip function.
  5. The function returns the created set.
  6. We call createRandomSetOfSizeN with a specific size (e.g., 5) and store the result in a variable named myRandomSet.
  7. Finally, we print the created set to the console using print_r.

PHP Program

<?php
function createRandomSetOfSizeN($n) {
    $array = [];
    while (count($array) < $n) {
        $randomNumber = rand(1, 100); // Generate random number between 1 and 100
        $array[$randomNumber] = true;
    }
    return array_flip(array_keys($array));
}

$myRandomSet = createRandomSetOfSizeN(5);
print_r($myRandomSet);
?>

Output

Array
(
    [14] => 14
    [56] => 56
    [32] => 32
    [78] => 78
    [99] => 99
)

Summary

In this tutorial, we learned How to create a Set of size N in PHP language with well detailed examples.


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