Using XML in PHP

[Zerodash]

I'm working on a project that requires me to place XML tags around data generated dynamically in PHP (no external documents, btw). I keep getting parse errors when I declare what version of XML I am using:
specifically <?xml version='1.0'?> no errors occurr when I do this: <?xml ?>, but this is incorrect.

Does anyone know about running XML in PHP?

[cka]

<?xml version=\"1.0\"?>

[Zerodash]

still no luck. Getting a parse error. :Parse error: parse error, unexpected T_STRING

[Calliander]

Post the code. For example:

if( $xls = fopen( $filename, "a" ) ) {
	$header = "<?xml version=\"1.0\"?>
<Workbook xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\" xmlns:o=\"urn:schemas-microsoft-com:office:office\" xmlns:x=\"urn:schemas-microsoft-com:office:excel\" xmlns:html=\"http://www.w3.org/TR/REC-html40\" xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\">
	<DocumentProperties xmlns=\"urn:schemas-microsoft-com:office:office\">
		<Author>ARS Parts Order Server</Author>
		<LastAuthor>ARS Parts Order Server</LastAuthor>
	</DocumentProperties>
	<OfficeDocumentSettings xmlns=\"urn:schemas-microsoft-com:office:office\">
		<AllowPNG/>
	</OfficeDocumentSettings>

Etc.

[cka]

Yeah, post code - especially whatever line PHP sez there's an error on