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PHP (Hypertext Preprocessor) is a server-side scripting language designed for web development. It is widely used to create dynamic and interactive web pages.
apt or yum.php -v in the terminal.Create a PHP file and add the following code:
<?php
echo "Hello, World!";
?>Save this file as hello.php and run it on your web server. Access it through your browser, e.g., http://localhost/hello.php.
In PHP, variables are declared with a $ sign. Common data types include:
<?php
$x = 10; // Integer
$y = 3.14; // Float
$name = "PHP"; // String
$isAvailable = true; // Boolean
echo "x = $x, y = $y, name = $name, isAvailable = $isAvailable";
?>PHP supports if, else if, and else statements.
<?php
$num = 10;
if ($num > 0) {
echo "Positive number";
} elseif ($num == 0) {
echo "Zero";
} else {
echo "Negative number";
}
?>PHP supports for, while, and foreach loops.
<?php
for ($i = 0; $i < 5; $i++) {
echo $i . "
";
}
?><?php
$count = 0;
while ($count < 5) {
echo $count . "
";
$count++;
}
?>Functions in PHP allow for reusable code blocks.
<?php
function greet($name) {
echo "Hello, $name!";
}
greet("Alice");
?>Arrays in PHP can be indexed or associative.
<?php
$numbers = [1, 2, 3, 4, 5];
foreach ($numbers as $num) {
echo $num . "
";
}
?>PHP supports object-oriented programming.
<?php
class Student {
public $name;
public $age;
public function __construct($name, $age) {
$this->name = $name;
$this->age = $age;
}
public function displayInfo() {
echo "Name: $this->name, Age: $this->age";
}
}
$s1 = new Student("John", 21);
$s1->displayInfo();
?>PHP makes file handling easy using built-in functions.
<?php
$file = fopen("example.txt", "w");
fwrite($file, "Hello, PHP!");
fclose($file);
$file = fopen("example.txt", "r");
echo fgets($file);
fclose($file);
?>Sessions and cookies are used to store user data.
<?php
session_start();
$_SESSION["user"] = "John";
echo "Session user: " . $_SESSION["user"];
setcookie("user", "John", time() + (86400 * 30), "/");
if (isset($_COOKIE["user"])) {
echo "Cookie user: " . $_COOKIE["user"];
}
?>Popular PHP libraries and frameworks include: