Alter Version

vendor/PhpSpreadsheet/Cell/StringValueBinder.php

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+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Cell;
+
+use PhpOffice\PhpSpreadsheet\Shared\StringHelper;
+
+class StringValueBinder implements IValueBinder
+{
+    /**
+     * Bind value to a cell.
+     *
+     * @param Cell $cell Cell to bind value to
+     * @param mixed $value Value to bind in cell
+     *
+     * @return bool
+     */
+    public function bindValue(Cell $cell, $value)
+    {
+        // sanitize UTF-8 strings
+        if (is_string($value)) {
+            $value = StringHelper::sanitizeUTF8($value);
+        }
+
+        $cell->setValueExplicit((string) $value, DataType::TYPE_STRING);
+
+        // Done!
+        return true;
+    }
+}