PHP Exercises: Check a given array of integers and return true if the array contains 10 or 20 twice

Last update on May 28 2025 13:07:22 (UTC/GMT +8 hours)

97. Check for Two Occurrences of 10 or 20

Write a PHP program to check a given array of integers and return true if the array contains 10 or 20 twice. The length of the array will be 0, 1, or 2.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes an array of numbers as a parameter
function test($nums)
 { 
    // Return true if the array has exactly two elements and
    // either both elements are 10 or both elements are 20
    return sizeof($nums) == 2 && (($nums[0] == 10 && $nums[1] == 10) || ($nums[0] == 20 && $nums[1] == 20));
 }   

// Check and display the result of calling 'test' with the array [12, 20]
var_dump(test([12, 20]));

// Check and display the result of calling 'test' with the array [20, 20]
var_dump(test([20, 20]));

// Check and display the result of calling 'test' with the array [10, 10]
var_dump(test([10, 10]));

// Check and display the result of calling 'test' with the array [10]
var_dump(test([10]));
?>

Explanation:

Function Definition:

A function named test is defined, which takes one parameter:

$nums: an array of numbers.

Return Condition:

The function checks two conditions:

The array has exactly two elements (sizeof($nums) == 2).
Either:

Both elements are 10 ($nums[0] == 10 && $nums[1] == 10), or
Both elements are 20 ($nums[0] == 20 && $nums[1] == 20).

The function returns true if both conditions are met; otherwise, it returns false.

Output:

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

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to test if a small array of length 0 to 2 contains the number 10 or 20 exactly twice.
Write a PHP function to iterate over an array and count occurrences of 10 and 20, returning true if either appears twice.
Write a PHP program to check a two-element array and output true if both elements are either 10 or 20.
Write a PHP script to use array counting functions to verify that an array contains exactly two occurrences of 10 or 20.

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PHP Code Editor:

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