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

Last update on May 28 2025 13:05:20 (UTC/GMT +8 hours)

33. First Four Elements Array Element Match

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:

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

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to check if any one of the first four elements in an array is equal to a given number.
Write a PHP function to compare a target value against the first four items of an integer array and return a boolean.
Write a PHP program to iterate over only the first four elements of an array and check for a match with a given integer.
Write a PHP script to use a for-loop with a limit of four iterations to test the presence of a specific number in an array.

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