PHP Exercises: Check if one of the first 4 elements in an array of integers is equal to a given element

PHP Basic Algorithm: Exercise-33 with Solution

Write a PHP program to check if one of the first 4 elements in an array of integers is equal to a given element.

Sample Solution:

PHP Code :

<?php
// Define a function that checks if a given number is present in an array of numbers
function test($nums, $n)
{
    // Use the sizeof function to check the size of the array and determine the range for in_array
    return sizeof($nums) < 4 ? in_array($n, $nums) : in_array($n, array_slice($nums, 0, 4));
}

// Test the function with different arrays and numbers
var_dump(test(array(1,2,9,3), 3));
var_dump(test(array(1,2,3,4,5,6), 2));
var_dump(test(array(1,2,2,3), 9));
?>

Explanation:

• Function Definition:
• The test function takes two parameters: an array of numbers $nums and a number $n to search for in the array.
• Check Array Size:
• sizeof($nums) checks the length of the array.
• If the array length is less than 4, the function checks if $n is present in the entire array using in_array().
• Check First Four Elements:
• If the array length is 4 or more, the function only checks if $n is in the first four elements by using array_slice($nums, 0, 4) to extract those elements.
• in_array($n, array_slice($nums, 0, 4)) then checks for $n in this slice.

Output:

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

Visual Presentation:

Flowchart:

PHP Code Editor:

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