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vendor/illuminate/database/PDO/Concerns/ConnectsToDatabase.php

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+<?php
+
+namespace Illuminate\Database\PDO\Concerns;
+
+use Illuminate\Database\PDO\Connection;
+use InvalidArgumentException;
+use PDO;
+
+trait ConnectsToDatabase
+{
+    /**
+     * Create a new database connection.
+     *
+     * @param  mixed[]  $params
+     * @param  string|null  $username
+     * @param  string|null  $password
+     * @param  mixed[]  $driverOptions
+     * @return \Illuminate\Database\PDO\Connection
+     *
+     * @throws \InvalidArgumentException
+     */
+    public function connect(array $params, $username = null, $password = null, array $driverOptions = [])
+    {
+        if (! isset($params['pdo']) || ! $params['pdo'] instanceof PDO) {
+            throw new InvalidArgumentException('Laravel requires the "pdo" property to be set and be a PDO instance.');
+        }
+
+        return new Connection($params['pdo']);
+    }
+}