21. Write a PHP script to check if a number is a Harshad (Niven) number.
Required Input:
18Expected Output:
trueCode In Php
<?php function isHarshad($num) { // Your code here } ?>
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22. Create a PHP script to merge two associative arrays and resolve key conflicts.
Required Input:
['a' => 1] + ['a' => 2, 'b' => 3]Expected Output:
{"a":2,"b":3}Code In Php
<?php function mergeArrays($arr1, $arr2) { // Your code here } ?>
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23. Write a PHP script to find the longest common prefix of an array of strings.
Required Input:
['flower', 'flow', 'flight']Expected Output:
flCode In Php
<?php function longestCommonPrefix($arr) { // Your code here } ?>
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24. Create a PHP script to find the most frequent element in an array.
Required Input:
[1, 2, 3, 1, 1, 2]Expected Output:
1Code In Php
<?php function mostFrequent($arr) { // Your code here } ?>
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25. Write a PHP script to check if a number is a Strong number.
Required Input:
145Expected Output:
trueCode In Php
<?php function isStrong($num) { // Your code here } ?>
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26. Create a PHP script to implement a basic LRU (Least Recently Used) cache using an array.
Required Input:
["get(1)", "put(2,3)"]Expected Output:
ACode In Php
<?php class LRUCache { // Your code here } ?>
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27. Write a PHP script to find the GCD of multiple numbers in an array.
Required Input:
[24, 36, 48]Expected Output:
12Code In Php
<?php function gcdArray($arr) { // Your code here } ?>
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28. Create a PHP script to generate a random alphanumeric string of a given length.
Required Input:
5Expected Output:
A9B3DCode In Php
<?php function randomString($length) { // Your code here } ?>
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29. Write a PHP script to convert a decimal number to hexadecimal manually.
Required Input:
255Expected Output:
FFCode In Php
<?php function decimalToHex($num) { // Your code here } ?>
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30. Create a PHP script to check if a given Sudoku row or column is valid.
Required Input:
[5,3,0,7,9,0,6,0,0]Expected Output:
trueCode In Php
<?php function isValidSudokuRow($arr) { // Your code here } ?>
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