fix: undefined offset (#4)

* fix: undefined offset

close swlib/saber#100

* add getLastKey

* refactor: getRedirectsTrace

* fix typo

* fix typo

* fix typo

Author: sy-records

src/Exception/TooManyRedirectsException.php

@@ -10,6 +10,7 @@
 use Exception;
 use Swlib\Http\Request;
 use Swlib\Http\Response;
+use Swlib\Http\Util;
 
 class TooManyRedirectsException extends RequestException
 {
@@ -24,7 +25,7 @@ public function __construct(
     ) {
         $this->redirect_headers = $redirects;
         $times = count($redirects);
-        $location = $this->redirect_headers[$times - 1];
+        $location = Util::getLastKey($this->redirect_headers);
         $message = "Too many redirects! more than {$times} times to {$location} !";
         parent::__construct($request, $response, $code, $message, $previous);
     }
@@ -37,8 +38,11 @@ public function getRedirectHeaders(): array
     public function getRedirectsTrace(): string
     {
         $trace = '';
-        foreach (array_keys($this->redirect_headers) as $index => $location) {
-            $trace .= "#$index $location\n";
+        $index = 0;
+
+        foreach ($this->redirect_headers as $location => $redirect_headers) {
+            $trace .= "#{$index} {$location}\n";
+            $index++;
         }
 
         return $trace;

src/Util.php

@@ -101,4 +101,16 @@ public static function parseHeaders(string $raw_header): array
             return self::parseHeader($raw_header[0]);
         }
     }
+
+    /**
+     * 获取数组最后一个键名
+     *
+     * @param array $array
+     * @return int|string|null
+     */
+    public static function getLastKey(array $array)
+    {
+        end($array);
+        return key($array);
+    }
 }