Update sample client

samples/client/petstore/php/SwaggerClient-php/autoload.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * An example of a project-specific implementation.
+ * 
+ * After registering this autoload function with SPL, the following line
+ * would cause the function to attempt to load the \Swagger\Client\Baz\Qux class
+ * from /path/to/project/lib/Baz/Qux.php:
+ * 
+ *      new \Swagger\Client\Baz\Qux;
+ *      
+ * @param string $class The fully-qualified class name.
+ * @return void
+ */
+spl_autoload_register(function ($class) {
+
+    // project-specific namespace prefix
+    $prefix = 'Swagger\\Client\\';
+
+    // base directory for the namespace prefix
+    $base_dir = __DIR__ . '/lib/';
+
+    // does the class use the namespace prefix?
+    $len = strlen($prefix);
+    if (strncmp($prefix, $class, $len) !== 0) {
+        // no, move to the next registered autoloader
+        return;
+    }
+
+    // get the relative class name
+    $relative_class = substr($class, $len);
+
+    // replace the namespace prefix with the base directory, replace namespace
+    // separators with directory separators in the relative class name, append
+    // with .php
+    $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';
+
+    // if the file exists, require it
+    if (file_exists($file)) {
+        require $file;
+    }
+});