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system/Helpers/xml_helper.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+// CodeIgniter XML Helpers
+
+if (! function_exists('xml_convert')) {
+    /**
+     * Convert Reserved XML characters to Entities
+     */
+    function xml_convert(string $str, bool $protectAll = false): string
+    {
+        $temp = '__TEMP_AMPERSANDS__';
+
+        // Replace entities to temporary markers so that
+        // ampersands won't get messed up
+        $str = preg_replace('/&#(\d+);/', $temp . '\\1;', $str);
+
+        if ($protectAll === true) {
+            $str = preg_replace('/&(\w+);/', $temp . '\\1;', $str);
+        }
+
+        $original = [
+            '&',
+            '<',
+            '>',
+            '"',
+            "'",
+            '-',
+        ];
+
+        $replacement = [
+            '&amp;',
+            '&lt;',
+            '&gt;',
+            '&quot;',
+            '&apos;',
+            '&#45;',
+        ];
+
+        $str = str_replace($original, $replacement, $str);
+
+        // Decode the temp markers back to entities
+        $str = preg_replace('/' . $temp . '(\d+);/', '&#\\1;', $str);
+
+        if ($protectAll === true) {
+            return preg_replace('/' . $temp . '(\w+);/', '&\\1;', $str);
+        }
+
+        return $str;
+    }
+}