PHP Exercises: Check if a given positive number is a multiple of 3 or a multiple of 7

Last update on May 28 2025 09:29:34 (UTC/GMT +8 hours)

10. Check Multiple of 3 or 7

Write a PHP program to check if a given positive number is a multiple of 3 or a multiple of 7.

Sample Solution:

PHP Code :

<?php
// Define a function named "test" that takes a parameter $n
function test($n) 
{
    // Use the modulo operator to check if $n is divisible by 3 or 7
    return $n % 3 == 0 || $n % 7 == 0;
}

// Call the test function with argument 3 and var_dump the result
var_dump(test(3));

// Call the test function with argument 14 and var_dump the result
var_dump(test(14));

// Call the test function with argument 12 and var_dump the result
var_dump(test(12));

// Call the test function with argument 37 and var_dump the result
var_dump(test(37));
?>

Explanation:

Function Definition:

The function test takes one parameter, $n.

Divisibility Check:

Uses the modulo operator % to check if $n is divisible by either 3 or 7.
Returns true if $n is divisible by 3 ($n % 3 == 0) or by 7 ($n % 7 == 0); otherwise, returns false.

Function Calls and Output:

First Call: test(3)

3 % 3 == 0, so it returns true.

Second Call: test(14)

14 % 7 == 0, so it returns true.

Third Call: test(12)

12 % 3 == 0, so it returns true.

Fourth Call: test(37)

37 is not divisible by either 3 or 7, so it returns false.

Output:

bool(true)
bool(true)
bool(true)
bool(false)

Visual Presentation:

PHP Basic Algorithm Exercises: Check if a given positive number is a multiple of 3 or a multiple of 7.

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to check if a positive number is divisible by 3 or 7, using modulus operators and proper condition grouping.
Write a PHP function to validate divisibility by 3 and 7 separately and then combine the results with logical operators.
Write a PHP program to determine the divisibility of an integer by 3 or 7 without using modulus operators.
Write a PHP script to check the factors of a given number and return true if it is a multiple of either 3 or 7, otherwise false.

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