<documentation title="Open PHP Tag">
<standard>
<![CDATA[
When the opening <?php tag is on the first line of the file, it must be on its own line with no other statements unless it is a file containing markup outside of PHP opening and closing tags.
]]>
</standard>
<code_comparison>
<code title="Valid: Opening PHP tag on a line by itself.">
<![CDATA[
<em><?php</em>
echo 'hi';
]]>
</code>
<code title="Invalid: Opening PHP tag not on a line by itself.">
<![CDATA[
<?php <em>echo 'hi';</em>
]]>
</code>
</code_comparison>
<code_comparison>
<code title="Valid: Opening PHP tag not on a line by itself, but has markup outside the closing PHP tag.">
<![CDATA[
<?php declare(strict_types=1); ?>
<html>
<body>
<?php
// ... additional PHP code ...
?>
</body>
</html>
]]>
</code>
<code title="Invalid: Opening PHP tag not on a line by itself without any markup in the file.">
<![CDATA[
<?php declare(strict_types=1); ?>
]]>
</code>
</code_comparison>
</documentation>
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