update:验证goods_sku_id方法封装

src/Common/GoodsSkuId.php

@@ -52,4 +52,47 @@ class GoodsSkuId
 
         return $tmp . $code;
     }
+
+    /**
+     * 验证 str 是否是合法的 goods_sku_id
+     * @param $str
+     * @return bool
+     */
+    public static function validGoodSkuId($str)
+    {
+        $strlen = strlen($str);
+
+        $chklen = 2;
+        $code = substr($str, -$chklen);
+        $str = substr($str, 0, $strlen-$chklen);
+        $strlen -= $chklen;
+
+        $base = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+
+        if ($strlen % 2 == 1)
+        {
+            $str = '0' . $str;
+            $strlen += 1;
+        }
+
+        $sum = 0;
+        $len = $strlen/2;
+
+        for ($i=0; $i<$len; $i++)
+        {
+            $sum *= 137;
+            $sum += ord($str[$i]) ^ ord($str[$strlen-$i-1]);
+        }
+
+        $ret = '';
+
+        for ($i=$chklen; $i>0; $i--)
+        {
+            $idx = $sum % 62;
+            $sum = ($sum-$idx) / 62;
+            $ret = $base[$idx] . $ret;
+        }
+
+        return $ret === $code;
+    }
 }
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