refactor: 修改上传限制可配置

app/admin/common.php

@@ -94,4 +94,42 @@ if (!function_exists('xlsx_writer')) {
         ]);
         return $response;
     }
+}
+
+if (!function_exists('strtobytes')) {
+
+    /**
+     * 字符串转字节
+     * @param string $str_size 字符串 例：'1MB' '2GB'
+     * @return int
+     */
+    function strtobytes(string $str_size): int
+    {
+        preg_match('/(\d+)(\w+)/', $str_size, $matches);
+        if (!isset($matches[1])) {
+            throw new \Exception('请确认size大小');
+        }
+        if (!isset($matches[2])) {
+            throw new \Exception('请确认单位');
+        }
+
+        $size = intval($matches[1]);
+        $unit = $matches[2];
+        switch (strtolower($unit)) {
+            case 'kb':
+                $size *= 1024;
+                break;
+            case 'mb': 
+                $size *= 1024 * 1024;
+                break;
+            case 'gb': 
+                $size *= 1024 * 1024 * 1024;
+                break;
+            case 'tb':
+                $size *= 1024 * 1024 * 1024 * 1024;
+            default: 
+                throw new \Exception('不支持[' . $unit . ']单位');
+        }
+        return $size;
+    }
 }