Linking to css file in include file

I would like to link to an external css file from with a php file that is included in another file.

The main file is generic and has a header where css links are placed and the include file is a custom file
and determined by conditions found by querying a database.

Also - Can I include css in the include file without linking to an external css file?

Thanks in anticipation.

All of this doesn't really mean much without seeing the files, but here are a few suggestions.

Quote:

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I would like to link to an external css file from with a php file that is included in another file.

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You'd probably do this via a PHP echo;

Code:

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echo '<link rel="stylesheet" href="/path/to/styles.css" />';

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Quote:

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Can I include css in the include file without linking to an external css file?

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Again, you'd probably do this via a PHP echo;

Code:

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echo '<style>';
echo 'selector { property: value; }';
echo '</style>';

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If you need more help, please provide a zip of the files you're using.