From 210ff2239f1e0f137703b9525d677c36a84dcce2 Mon Sep 17 00:00:00 2001
From: Roy Van Ginneken <roy.vanginneken@intracto.com>
Date: Mon, 28 Sep 2020 09:51:01 +0200
Subject: [PATCH] Make sure we don\t check the same for existing multiple times

---
 tcpdf.php | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/tcpdf.php b/tcpdf.php
index a09ad4c..2d09a80 100644
--- a/tcpdf.php
+++ b/tcpdf.php
@@ -6885,7 +6885,7 @@ class TCPDF {
 				$exurl = $file;
 			}
 			// check if file exist and it is valid
-			if (!@TCPDF_STATIC::file_exists($file)) {
+			if (!@$this->fileExists($file)) {
 				return false;
 			}
 			if (($imsize = @getimagesize($file)) === FALSE) {
@@ -24579,6 +24579,11 @@ Putting 1 is equivalent to putting 0 and calling Ln() just after. Default value:
 
 	// --- END SVG METHODS -----------------------------------------------------
 
+    /**
+     * Keeps files in memory, so it doesn't need to downloaded everytime in a loop
+     * @param string $file
+     * @return string
+     */
     protected function getCachedFileContents($file)
     {
         if (!isset($this->fileContentCache[$file])) {
@@ -24587,6 +24592,20 @@ Putting 1 is equivalent to putting 0 and calling Ln() just after. Default value:
         return $this->fileContentCache[$file];
     }
 
+    /**
+     * Make use of the file content cache, to avoid a lot of calls to an external server to see if a file exists
+     * @param string $file
+     * @return bool
+     */
+    protected function fileExists($file)
+    {
+        if (isset($this->fileContentCache[$file])) {
+            return true;
+        }
+
+        return TCPDF_STATIC::file_exists($file);
+    }
+
 } // END OF TCPDF CLASS
 
 //============================================================+