PHP Code Sample: A Comprehensive Guide

PHP is a widely used scripting language for web development. It offers a range of features and functionalities that make it a popular choice among developers. In this article, we will explore some PHP code samples to help you understand its capabilities and how it can be used effectively.

1. Hello World!

Let's start with the classic "Hello World!" example. This simple code snippet demonstrates the basic syntax of PHP:

<?php
echo "Hello World!";
?>

When you run this code, it will display "Hello World!" on the screen. This example showcases the echo statement, which is used to output text or variables.

2. Variables and Data Types

PHP supports various data types, including strings, integers, floats, booleans, arrays, and objects. Here's an example that demonstrates how to declare and use variables:

<?php
$name = "John Doe";
$age = 25;
$height = 1.75;
$isStudent = true;

echo "Name: " . $name . "<br>";
echo "Age: " . $age . "<br>";
echo "Height: " . $height . "<br>";
echo "Is Student: " . ($isStudent ? "Yes" : "No") . "<br>";
?>

In this code, we declare variables for name, age, height, and student status. The . (dot) operator is used for concatenation. The output will display the values assigned to these variables.

3. Conditional Statements

PHP provides several conditional statements, such as if, else, and switch. Here's an example that demonstrates the usage of an if statement:

<?php
$score = 85;

if ($score >= 90) {
echo "Excellent!";
} elseif ($score >= 80) {
echo "Good!";
} else {
echo "Needs Improvement!";
}
?>

In this code, we check the value of the $score variable and display a corresponding message based on the condition. The output will vary depending on the value assigned to $score.

4. Loops

PHP offers different types of loops, such as for, while, and foreach. Here's an example that demonstrates the usage of a for loop:

<?php
for ($i = 1; $i <= 5; $i++) {
echo $i . " ";
}
?>

This code will display numbers from 1 to 5 using a for loop. The loop starts with an initial value of 1, increments by 1 in each iteration, and continues until the condition becomes false.

5. Functions

PHP allows you to define and use functions to encapsulate reusable blocks of code. Here's an example that demonstrates the usage of a function:

<?php
function calculateSum($num1, $num2) {
return $num1 + $num2;
}

$result = calculateSum(5, 3);
echo "Sum: " . $result;
?>

In this code, we define a function called calculateSum that takes two parameters and returns their sum. We then call the function with arguments 5 and 3, and display the result.

Conclusion

These PHP code samples provide a glimpse into the capabilities of the language. PHP is a versatile scripting language that can be used for various web development tasks. By understanding these code examples, you can start exploring and leveraging the power of PHP in your own projects.

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