PHP is a widely-used, open-source server-side scripting language primarily used for web development. PHP code can be embedded into HTML, or it can be used in combination with various web template systems and web frameworks. Given the vastness of PHP, I can provide a brief overview of some of the essential aspects of PHP with examples. Here we go:
echo "Hello, world!";
print "Hello again!";
$name = "John";
echo $name;
2. Data Types: PHP supports multiple data types:
$string = "Hello, PHP!";
$integer = 42;
$float = 3.14;
$isTrue = true; // or false
$colors = array("red", "green", "blue");
3. Control Structures:
$age = 20;
if ($age >= 18) {
echo "You are an adult.";
} else {
echo "You are not an adult.";
}
for ($i = 0; $i < 5; $i++) {
echo $i;
}
$colors = array("red", "green", "blue");
foreach ($colors as $color) {
echo $color . "<br>";
}
4. Functions:
function greet($name) {
return "Hello, " . $name . "!";
}
echo greet("John");
5. Superglobals: These are built-in variables in PHP that are always accessible.
Used to collect form data. Let's say you have a form (`form.html`):
<form action="process.php" method="post">
Name: <input type="text" name="name"><br>
Age: <input type="text" name="age"><br>
<input type="submit">
</form>
In `process.php`:
$name = $_POST['name'];
$age = $_POST['age'];
echo "Your name is " . $name . " and you are " . $age . " years old.";
6. Database Operations with MySQL: Using the mysqli extension, we can connect to a MySQL database, run queries, and fetch results:
$conn = mysqli_connect("localhost", "username", "password", "database");
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
$sql = "SELECT id, name FROM users";
$result = mysqli_query($conn, $sql);
while($row = mysqli_fetch_assoc($result)) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
}
mysqli_close($conn);
This is a very concise introduction to PHP. To learn more about each topic, consider checking the official PHP documentation or some online PHP tutorials. Remember, practical experience is crucial β the more you practice, the better you'll get!
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