PHP Interview Programs

Definition and Usage

PHP interview programs are short practice problems used in PHP tutorials, college labs, and fresher technical rounds. They reward clear loops, careful conditions, and clean echo output more than large application design.

What you practice

Most drills build the same PHP skills: take inputs, process with for/while/foreach and if, print results, and handle edge cases. Number checks, digit math, arrays, matrices, and base conversions show up again and again.

What should beginners solve first?

Start with Even Number, Odd Number, and Prime Number. Then try Sum of Digits, Factorial, and Fibonacci Series before arrays and matrices.

This lesson vs program pages

This page is the PHP interview hub: how to approach problems, which topic to practice next, and how each tutorial is structured. The programs index lists 50 individual guides—each with algorithm, complete code, output, and FAQs.

PHP Syntax

A typical interview program takes a value, decides with a condition or loop, and prints the result:

<?php
function isEven($n) {
    return $n % 2 == 0;
}

$n = 42;

if (isEven($n)) {
    echo $n . " is even.\n";
} else {
    echo $n . " is odd.\n";
}
/* php interview_skeleton.php */

Core PHP Concepts

Skills these PHP interview programs reinforce:

Learning order in this PHP tutorial

Choose a Topic by Goal

Pick a practice cluster based on what you need to strengthen:

Jump to a category

How to Practice Interview Programs in PHP

A practical workflow for this tutorial track:

1. Read the problem: inputs, outputs, and constraints (range, negatives, zero).
2. Write the algorithm in plain language before coding.
3. Implement with clear functions, $variables, and echo.
4. Test edge cases, then run: php file.php.
5. Explain time complexity in one sentence (often O(1) or O(n) for these drills).
6. Open the next program in the same category before jumping topics.

Live Preview

Enter an integer to preview the even/odd check—the same idea as Even Number and Odd Number.

PHP Examples

Three starter patterns from this PHP tutorial track. Open the linked program page for the full walkthrough.

<?php
$n = 18;

if ($n % 2 == 0) {
    echo $n . " is even.\n";
} else {
    echo $n . " is odd.\n";
}

18 is even.

<?php
$n = 482;
$sum = 0;
$temp = $n;

while ($temp > 0) {
    $sum += $temp % 10;
    $temp = (int)($temp / 10);
}

echo "Sum of digits of " . $n . " = " . $sum . "\n";

Sum of digits of 482 = 14

<?php
$nums = [4, 7, 1, 9];
$sum = 0;

for ($i = 0; $i < count($nums); $i++) {
    $sum += $nums[$i];
}

echo "Sum = " . $sum . "\n";

Sum = 21

PHP Interview Programs Index

50 practice programs. Search by name or browse by category. Each row opens a full PHP tutorial.

Key Takeaways