Creating a comprehensive guide for PHP and MySQL would require a lot of space, but I can certainly provide an overview with some examples to get you started.
PHP: A popular server-side scripting language designed for web development but can also be used as a general-purpose programming language. MySQL: The world's most widely used open-source relational database management system (RDBMS).
Before starting, you'll need to have PHP and MySQL installed. Most web hosting providers offer both. For local development, consider tools like XAMPP, MAMP, or WAMP.
To interact with MySQL, PHP provides the MySQLi (MySQL Improved) and PDO (PHP Data Objects) extensions. We'll use MySQLi for this example:
<?php
$server = "localhost";
$username = "username";
$password = "password";
$database = "my_database";
// Create connection
$conn = new mysqli($server, $username, $password, $database);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
?>
Insert data into the `users` table:
$sql = "INSERT INTO users (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')";
if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
Retrieve data from the `users` table:
$sql = "SELECT id, firstname, lastname FROM users";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";
}
} else {
echo "0 results";
}
Update data in the `users` table:
$sql = "UPDATE users SET lastname='Smith' WHERE id=1";
if ($conn->query($sql) === TRUE) {
echo "Record updated successfully";
} else {
echo "Error updating record: " . $conn->error;
}
Delete data from the `users` table:
$sql = "DELETE FROM users WHERE id=1";
if ($conn->query($sql) === TRUE) {
echo "Record deleted successfully";
} else {
echo "Error deleting record: " . $conn->error;
}
After you're done with your operations, close the connection:
$conn->close();
This is a basic introduction. PHP and MySQL have a lot more to offer. Consider exploring more advanced topics, libraries, and frameworks as you become comfortable with these basics.
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