feat(function): add mysql example in PHP

functions/mysql-php/README.md

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+# MySQL RDB and PHP functions
+
+A small example of a PHP function that creates a table in a MySQL database and inserts a row into it.
+
+## Deploying
+
+1. Create a MySQL database from the Scaleway console.
+   1. Make sure to create a user as well.
+2. Create a new function namespace and a PHP function running using PHP 8.2
+3. Copy the contents of `handler.php` into the function code editor.
+4. Add the following environment variables to the function:
+   - `MYSQL_HOST`: The hostname of the MySQL database
+   - `MYSQL_USER`: The username of the MySQL user
+   - `MYSQL_PASSWORD`: The password of the MySQL user
+   - `MYSQL_DB`: The name of the MySQL database
+5. Deploy the function.
+6. Grab the function URL and use it to call the function.
+
+## Usage
+
+Call the function with a body to insert a row into the table.
+
+```console
+curl -X POST -d '{"email": "[email protected]"}' <function-url>
+Inserted [email protected] into the database
+```

functions/mysql-php/handler.php

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+<?php
+function insertRecord($mysqli, $tableName, $data) {
+    // Check if mysqli object is null
+    if ($mysqli === null) {
+        die("Database connection is not established.");
+    }
+
+    // Create table if it doesn't exist
+    $createTableSql = "CREATE TABLE IF NOT EXISTS `$tableName` (
+        id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+        email VARCHAR(50),
+        reg_date TIMESTAMP
+    )";
+
+    if ($mysqli->query($createTableSql) === FALSE) {
+        die("Error creating table: " . $mysqli->error);
+    }
+
+    // Prepare SQL statement
+    $stmt = $mysqli->prepare("INSERT INTO $tableName (email, reg_date) VALUES (?, NOW())");
+    if ($stmt === false) {
+        die("Error preparing statement: " . $mysqli->error);
+    }
+
+    // Bind parameters
+    $stmt->bind_param("s", $data['email']);
+
+    // Execute statement
+    if ($stmt->execute() === false) {
+        die("Error executing statement: " . $stmt->error);
+    }
+
+    echo "Record inserted successfully";
+    $stmt->close();
+}
+
+function handle($event, $context) {
+    $dbHost = getenv('MYSQL_HOST');
+    $dbUsername = getenv('MYSQL_USER');
+    $dbPassword = getenv('MYSQL_PASSWORD');
+    $dbName = getenv('MYSQL_DB');
+
+    $mysqli = new mysqli($dbHost, $dbUsername, $dbPassword, $dbName);
+    $tableName = "users";
+
+    if ($mysqli === null) {
+        die("Database connection is not established.");
+    }
+
+    if ($mysqli->connect_error) {
+        die("Connection failed: " . $mysqli->connect_error);
+    }
+
+    // Extract user data from the request
+    $data = json_decode($event['body'], true);
+    if ($data === null || $data['email'] === null) {
+        return [
+            "body" => "Email is required",
+            "statusCode" => 400,
+        ];
+    }
+
+    try {
+        insertRecord($mysqli, $tableName, $data);
+    } catch (Exception $e) {
+        return [
+            "body" => "Error: " . $e->getMessage(),
+            "statusCode" => 500,
+        ];
+    }
+
+	return [
+		"body" => "Inserted " . $data['email'] . " into the database",
+		"statusCode" => 200,
+	];
+}