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Much of the functionality of PHP is delivered by extensions - plug-in files that are loaded when you start your web server (or PHP process on some configuration).Database access is delivered through extensions, and there are multiple options to choose from.Since fetching rows is a very common use case, we'll wrap it up in its own function: , we need to handle the error.Otherwise we can use the returned database data in our application.I will explain the reasoning behind each step and compare it with the less desired alternative.This tutorial does not cover installing My SQL on your web server - it focuses on using it in PHP.An OOP version of this tutorial has been included at the end of the tutorial.I added one small wrinkle in there - defining $connection as a static variable, which means its state will be kept between function calls to , the connection would be kept globally by My SQL.
For the purposes of this tutorial we use the My SQLi extension.
A note about My SQLi: PHP presents two ways to use My SQLi - procedural (functions) or object-oriented (using the My SQLi set of classes).
Both are identical syntax and usage wise, except for the way you call the functions (as standalone or on a My SQLi object).
Let's create a simple configuration file, which looks like this: // Load configuration as an array.
Use the actual location of your configuration file $config = parse_ini_file('../config.ini'); // Try and connect to the database $connection = mysqli_connect('localhost',$config['username'],$config['password'],$config['dbname']); // If connection was not successful, handle the error if($connection === false) We've abstracted the credentials from the connection.
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It's insecure, uses outdated methods, does not protect from change and promotes bad habits, but it does work.