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Dasar PHP

Sarah Johnson
1 January 0001
4-5 jam

Dasar PHP - Memulai dengan PHP

PHP (Hypertext Preprocessor) adalah bahasa pemrograman server-side yang powerful untuk pengembangan web. Mari kita mulai dengan dasar-dasar PHP.

Apa itu PHP?

PHP adalah bahasa pemrograman open-source yang dirancang khusus untuk pengembangan web. PHP dapat di-embed ke dalam HTML dan berjalan di server.

Keunggulan PHP

  • Easy to Learn: Syntax yang sederhana dan mudah dipahami
  • Cross-platform: Berjalan di berbagai sistem operasi
  • Large Community: Komunitas yang besar dan aktif
  • Rich Ecosystem: Banyak framework dan library
  • Database Support: Dukungan berbagai database
  • Web-focused: Dirancang khusus untuk web development

Setup Development Environment

System Requirements

  • PHP >= 8.0
  • Web server (Apache/Nginx)
  • Text editor atau IDE
  • Database (optional)

Instalasi PHP

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# Ubuntu/Debian
sudo apt update
sudo apt install php php-cli php-fpm

# macOS dengan Homebrew
brew install php

# Windows dengan XAMPP/WAMP
# Download dari https://www.apachefriends.org/

Syntax Dasar PHP

1. PHP Tags

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<?php
// PHP code here
?>

<?= "Hello World" ?>  // Echo shorthand

2. Variables

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<?php
$name = "John Doe";
$age = 25;
$isStudent = true;
$price = 19.99;

echo $name;  // Output: John Doe
var_dump($age);  // Output: int(25)
?>

3. Data Types

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<?php
// String
$string = "Hello World";

// Integer
$integer = 42;

// Float
$float = 3.14;

// Boolean
$boolean = true;

// Array
$array = [1, 2, 3, 4, 5];

// Object
$object = new stdClass();

// Null
$null = null;
?>

4. Strings

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<?php
$name = "PHP";

// String concatenation
echo "Hello " . $name;  // Hello PHP

// String interpolation
echo "Hello $name";  // Hello PHP

// String functions
echo strlen($name);  // 3
echo strtoupper($name);  // PHP
echo strtolower($name);  // php
?>

5. Arrays

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<?php
// Indexed array
$fruits = ["Apple", "Banana", "Orange"];

// Associative array
$person = [
    "name" => "John",
    "age" => 25,
    "city" => "New York"
];

// Accessing array elements
echo $fruits[0];  // Apple
echo $person["name"];  // John

// Array functions
echo count($fruits);  // 3
array_push($fruits, "Mango");
?>

Control Structures

1. Conditional Statements

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<?php
$age = 18;

if ($age >= 18) {
    echo "You are an adult";
} elseif ($age >= 13) {
    echo "You are a teenager";
} else {
    echo "You are a child";
}

// Ternary operator
$status = ($age >= 18) ? "adult" : "minor";
?>

2. Loops

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<?php
// For loop
for ($i = 0; $i < 5; $i++) {
    echo $i . " ";
}

// While loop
$i = 0;
while ($i < 5) {
    echo $i . " ";
    $i++;
}

// Foreach loop
$fruits = ["Apple", "Banana", "Orange"];
foreach ($fruits as $fruit) {
    echo $fruit . " ";
}

// Foreach with keys
foreach ($fruits as $index => $fruit) {
    echo "$index: $fruit ";
}
?>

Functions

1. Function Declaration

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<?php
function greet($name) {
    return "Hello, $name!";
}

echo greet("John");  // Hello, John!

// Function with default parameter
function greetWithTitle($name, $title = "Mr.") {
    return "Hello, $title $name!";
}

echo greetWithTitle("John");  // Hello, Mr. John!
echo greetWithTitle("Jane", "Ms.");  // Hello, Ms. Jane!
?>

2. Built-in Functions

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<?php
// String functions
$text = "Hello World";
echo strlen($text);  // 11
echo strpos($text, "World");  // 6
echo substr($text, 0, 5);  // Hello

// Array functions
$numbers = [1, 2, 3, 4, 5];
echo count($numbers);  // 5
echo max($numbers);  // 5
echo min($numbers);  // 1
echo array_sum($numbers);  // 15
?>

Working with Forms

1. HTML Form

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<form method="POST" action="process.php">
    <input type="text" name="username" placeholder="Username">
    <input type="email" name="email" placeholder="Email">
    <button type="submit">Submit</button>
</form>

2. Processing Form Data

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<?php
// process.php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $email = $_POST["email"];
    
    echo "Username: " . htmlspecialchars($username) . "<br>";
    echo "Email: " . htmlspecialchars($email) . "<br>";
}
?>

Next Steps

Di modul selanjutnya, kita akan mempelajari:

  • Object-Oriented Programming (OOP)
  • File handling
  • Database integration
  • Error handling
  • Security best practices

Mari lanjutkan ke modul berikutnya!

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