[6.0] Cache language files (#45289)

Author: HLeithner

libraries/src/Language/LanguageHelper.php

@@ -15,7 +15,9 @@
 use Joomla\CMS\Installer\Installer;
 use Joomla\CMS\Log\Log;
 use Joomla\Database\DatabaseInterface;
+use Joomla\Filesystem\Exception\FilesystemException;
 use Joomla\Filesystem\File;
+use Joomla\Filesystem\Folder;
 use Joomla\Registry\Registry;
 use Joomla\Utilities\ArrayHelper;
 
@@ -444,6 +446,12 @@ public static function parseIniFile($fileName, $debug = false)
             return [];
         }
 
+        $cacheFile = JPATH_CACHE . '/language/' . ltrim(str_replace([JPATH_ROOT, '/'], ['', '-'], $fileName), '-') . '.' . filemtime($fileName) . '.php';
+
+        if (is_file($cacheFile)) {
+            return include $cacheFile;
+        }
+
         // This was required for https://github.com/joomla/joomla-cms/issues/17198 but not sure what server setup
         // issue it is solving
         $disabledFunctions      = explode(',', \ini_get('disable_functions'));
@@ -471,10 +479,28 @@ public static function parseIniFile($fileName, $debug = false)
             restore_error_handler();
         }
 
+        if (!\is_array($strings)) {
+            $strings = [];
+        }
+
         // Ini files are processed in the "RAW" mode of parse_ini_string, leaving escaped quotes untouched - lets postprocess them
         $strings = str_replace('\"', '"', $strings);
 
-        return \is_array($strings) ? $strings : [];
+        // Write cache
+        try {
+            Folder::create(\dirname($cacheFile));
+
+            $data         = "<?php\ndefined('_JEXEC') or die;\nreturn " . var_export($strings, true) . ";\n";
+            $bytesWritten = file_put_contents($cacheFile, $data);
+
+            if ($bytesWritten === false || $bytesWritten < \strlen($data)) {
+                throw new FilesystemException('Unable to write cache file');
+            }
+        } catch (\FilesystemException $e) {
+            // We ignore the error, as the file is for caching only.
+        }
+
+        return $strings;
     }
 
     /**