How can PHP developers optimize the use of geshi for syntax highlighting while minimizing the highlighting of unnecessary code within a tutorial entry?

To optimize the use of GeSHi for syntax highlighting while minimizing the highlighting of unnecessary code within a tutorial entry, PHP developers can use the "set_header_type" function to specify the language of the code snippet. By setting the header type, GeSHi will only highlight the relevant syntax and ignore any unnecessary code. This ensures that only the code intended for highlighting is formatted correctly.

$geshi = new GeSHi($source_code, 'php');
$geshi->set_header_type(GESHI_HEADER_NONE);
echo $geshi->parse_code();