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wp-content/plugins/przelewy24/includes/p24-autoload.php

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+<?php
+/**
+ * Autoload classes of Przelewy24 Plugin.
+ *
+ * The class has 3 requirements:
+ * 1. The class should start (case insensitive) from ‘P24_’.
+ * 2. The file has to reside in includes directory.
+ * 3. The file should be prefixed with ‘class-’.
+ * 4. The extension should be ‘php’.
+ * 5. The underscores should be replaced by hyphens.
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+spl_autoload_register(
+	function( $class ) {
+		if ( preg_match( '/^p24_[a-z][a-z0-9\\_]+/i', $class ) ) {
+			$normalised = strtolower( strtr( $class, array( '_' => '-' ) ) );
+			$directories = array(
+				__DIR__,
+				__DIR__ . '/subscription',
+				__DIR__ . '/report-data-stores',
+				__DIR__ . '/rest_api',
+				__DIR__ . '/multi_currency',
+			);
+			foreach ( $directories as $directory ) {
+				$path_class = $directory . '/class-' . $normalised . '.php';
+				if ( is_readable( $path_class ) ) {
+					require_once $path_class;
+
+					return;
+				}
+			}
+		}
+	}
+);