With PHP, you can create various types of web pages, including static pages that do not load dynamically but are pre-created and ready to be uploaded to the server. However, the main advantage of PHP is its ability to create dynamic web pages that can respond to user inputs and display content from databases.
Thanks to its object-oriented approach and extensive library of functions, PHP is a popular language among web application developers. Additionally, PHP has an easy syntax and is highly flexible, allowing developers to write code according to their individual preferences.
PHP also easily integrates with many database systems, such as MySQL, PostgreSQL, and Oracle, allowing developers to access and manage data directly from the web application.
Currently, PHP is one of the most widely used languages for web application development, and its popularity continues to grow. If you want to start developing web applications, PHP can be a great choice for your projects.
<?php
// Připojení k MySQL serveru
$host = "localhost"; // název hostitele
$username = "username"; // uživatelské jméno
$password = "password"; // heslo
$dbname = "database_name"; // název databáze
// Vytvoření připojení
$conn = mysqli_connect($host, $username, $password, $dbname);
// Kontrola připojení
if (!$conn) {
die("Připojení selhalo: " . mysqli_connect_error());
}
echo "Úspěšné připojení k MySQL serveru";
// Ukončení připojení
mysqli_close($conn);
?>
PHP script to connect to MySQL database
This script connects to a MySQL database using PHP’s mysqli extension and performs some basic operations. Here is a breakdown of the code:
- Define connection parameters:
$host = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";
The script defines four variables, namely the database host name, username, password, and database name.
- Create connection:
$conn = mysqli_connect($host, $username, $password, $dbname);
This line creates a connection to the database using the mysqli_connect() function. The function takes four parameters: host, username, password, and database name. It returns a connection object which is stored in the $conn variable.
- Check the connection:
if (!$conn) {
die("Připojení selhalo: " . mysqli_connect_error());
}
This line checks if the connection was successful. If the connection failed, the script will exit with a message that shows the error that occurred during the connection attempt.
- Print success message:
echo "Úspěšné připojení k MySQL serveru";
If the connection is successful, this line will print a success message.
- Close the connection
mysqli_close($conn);
Finally, this line closes the connection to the database using the mysqli_close() function. This is an optional step but is recommended to release resources used by the connection.
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