What potential pitfalls should be considered when using Umlaut characters in Excel sheet names with PHPExcel?

When using Umlaut characters in Excel sheet names with PHPExcel, potential pitfalls to consider include compatibility issues with different Excel versions or systems that do not support special characters in sheet names. To avoid these pitfalls, it is recommended to remove or replace Umlaut characters with standard characters before setting the sheet name in PHPExcel.

// Remove Umlaut characters from sheet name
$sheetName = &#039;&Auml;pfel und Birnen&#039;;
$sheetName = str_replace([&#039;&Auml;&#039;, &#039;&auml;&#039;, &#039;&Ouml;&#039;, &#039;&ouml;&#039;, &#039;&Uuml;&#039;, &#039;&uuml;&#039;, &#039;&szlig;&#039;], [&#039;Ae&#039;, &#039;ae&#039;, &#039;Oe&#039;, &#039;oe&#039;, &#039;Ue&#039;, &#039;ue&#039;, &#039;ss&#039;], $sheetName);

// Set the modified sheet name in PHPExcel
$objPHPExcel-&gt;getActiveSheet()-&gt;setTitle($sheetName);

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Umlaut characters Excel sheet names PHPExcel encoding compatibility

What potential pitfalls should be considered when using Umlaut characters in Excel sheet names with PHPExcel?

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