diff --git a/app/Helper/TextHelper.php b/app/Helper/TextHelper.php
index 89c1a8f39..698bef6db 100644
--- a/app/Helper/TextHelper.php
+++ b/app/Helper/TextHelper.php
@@ -90,19 +90,19 @@ class TextHelper extends Base
      */
     public function phpToBytes($val)
     {
-        $val = trim($val);
-        $last = strtolower($val[strlen($val)-1]);
+        $size = (int) substr($val, 0, -1);
+        $last = strtolower(substr($val, -1));
 
         switch ($last) {
             case 'g':
-                $val *= 1024;
+                $size *= 1024;
             case 'm':
-                $val *= 1024;
+                $size *= 1024;
             case 'k':
-                $val *= 1024;
+                $size *= 1024;
         }
 
-        return $val;
+        return $size;
     }
 
     /**