How to check if Two Sets are Equal in PHP - Step by Step Examples

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How to check if Two Sets are Equal in PHP ?

Answer

In PHP, you can check if two sets are equal by comparing their elements using built-in functions.

✐ Examples

1 Check Equality of Two Sets using Arrays - Equal Sets

In this example,

We create two arrays named $set1 and $set2.
We add the same elements to both arrays.
We use the array_diff function to compare the arrays for equality.
If the result of array_diff is an empty array, then sets are equal; otherwise, they are not.

PHP Program

<?php 
$set1 = [1, 2, 3];
$set2 = [1, 2, 3];

echo empty(array_diff($set1, $set2)) ? 'true' : 'false'; // Output: true
?>

Output

true

2 Check Equality of Two Sets using Loops - Non-Equal Sets

In this example,

We create two arrays named $set1 and $set2.
We add different elements to both arrays.
We define a function named setsAreEqual to compare the sets.
Inside the function, we first check if the sizes of both arrays are equal.
We then iterate over each element of $set1 using a loop and check if it exists in $set2.
If all elements are found, we return true; otherwise, we return false.

PHP Program

<?php 
$set1 = [1, 2, 3];
$set2 = [4, 5, 6];

function setsAreEqual($set1, $set2) {
    if (count($set1) !== count($set2)) {
        return false;
    }
    foreach ($set1 as $item) {
        if (!in_array($item, $set2)) {
            return false;
        }
    }
    return true;
}

echo setsAreEqual($set1, $set2) ? 'true' : 'false'; // Output: false
?>

Output

false

Summary

In this tutorial, we learned How to check if Two Sets are Equal in PHP language with well detailed examples.

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How to check if Two Sets are Equal in PHP - Step by Step Examples

How to check if Two Sets are Equal in PHP ?

Answer

✐ Examples

1 Check Equality of Two Sets using Arrays - Equal Sets

PHP Program

Output

2 Check Equality of Two Sets using Loops - Non-Equal Sets

PHP Program

Output

Summary

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