From 1d38fca715937e4f26371ce7e68d2e216c46be19 Mon Sep 17 00:00:00 2001
From: Stephen Sweetland <steve.sweetland@gmail.com>
Date: Thu, 25 May 2017 11:06:32 +0100
Subject: [PATCH] Update CellHelper.php

New function, try to identify a formula string
---
 src/Spout/Writer/Common/Helper/CellHelper.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/Spout/Writer/Common/Helper/CellHelper.php b/src/Spout/Writer/Common/Helper/CellHelper.php
index 50ead93..0bee960 100644
--- a/src/Spout/Writer/Common/Helper/CellHelper.php
+++ b/src/Spout/Writer/Common/Helper/CellHelper.php
@@ -64,6 +64,17 @@ class CellHelper
         return (gettype($value) === 'string' && $value !== '');
     }
 
+    /**
+     * Returns whether the given value looks like a formula
+     *
+     * @param $value
+     * @return bool whether the given value looks like a formula
+     */
+    public static function isFormulaString($value)
+    {
+        return (strpos($value,'=') === 0);
+    }
+
     /**
      * Returns whether the given value is numeric.
      * A numeric value is from type "integer" or "double" ("float" is not returned by gettype).