Memory Leak in Sample35 (#3062)

* Memory Leak in Sample35

All but 6 chart samples can be rendered by Sample35. Of those 6, 3 of the problems are because the script runs out of memory processing them. Adopting a suggestion from @MAKS-dev in issue #2092, adding a call to gc_collect_cycles after the charts from each spreadsheet is rendered appears to make it possible to include those 3 spreadsheets in Sample35 after all.

Also take advantage of this opportunity to correct a number (hopefully all) of Scrutinizer problems with JpgraphRendererBases.

* Minor Fix

Problem running 8.1 unit tests.

* Resolve Problems with Pie 3D Charts

Minor fix, leaving only one spreadsheet unusable in Sample35. The reasons for its unusability are now documented in the code.

* Mitoteam Made Changes

Discussing this problem with them, they decided they should make a change for Pie3D rather than forcing us to use the workaround pushed earlier. Change to require mitoteam 10.2.3, revert workaround.

samples/Chart/35_Chart_render.php

@@ -25,12 +25,10 @@ if (count($inputFileNames) === 1) {
     $unresolvedErrors = [];
 } else {
     $unresolvedErrors = [
+        // The following spreadsheet was created by 3rd party software,
+        // and doesn't include the data that usually accompanies a chart.
+        // That is good enough for Excel, but not for JpGraph.
         '32readwriteBubbleChart2.xlsx',
-        '32readwritePieChart3.xlsx',
-        '32readwritePieChart4.xlsx',
-        '32readwritePieChart3D1.xlsx',
-        '32readwritePieChartExploded1.xlsx',
-        '32readwritePieChartExploded3D1.xlsx',
     ];
 }
 foreach ($inputFileNames as $inputFileName) {
@@ -42,7 +40,9 @@ foreach ($inputFileNames as $inputFileName) {
         continue;
     }
     if (in_array($inputFileNameShort, $unresolvedErrors, true)) {
-        $helper->log('File ' . $inputFileNameShort . ' does not yet work with this script');
+        $helper->log('*****');
+        $helper->log('***** File ' . $inputFileNameShort . ' does not yet work with this script');
+        $helper->log('*****');
 
         continue;
     }
@@ -92,6 +92,7 @@ foreach ($inputFileNames as $inputFileName) {
 
     $spreadsheet->disconnectWorksheets();
     unset($spreadsheet);
+    gc_collect_cycles();
 }
 
 $helper->log('Done rendering charts as images');