1<documentation title="Opening Tag at Start of File"> 2 <standard> 3 <![CDATA[ 4 The opening php tag should be the first item in the file. 5 ]]> 6 </standard> 7 <code_comparison> 8 <code title="Valid: A file starting with an opening php tag."> 9 <![CDATA[ 10<em></em><?php 11echo 'Foo'; 12 ]]> 13 </code> 14 <code title="Invalid: A file with content before the opening php tag."> 15 <![CDATA[ 16<em>Beginning content</em> 17<?php 18echo 'Foo'; 19 ]]> 20 </code> 21 </code_comparison> 22</documentation> 23