php output single quotes

The following outputs double quotes. How can I get it to output single quotes?\[code\]<?php$xml_output = "<?xml version=\"1.0\"?>\n";$xml_output .= "<I song='song'>";echo $xml_output;\[/code\]The output is \[code\]<I song="song" />\[/code\]Output should be \[code\]<I song='song' />\[/code\]
 
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