You can output any type of code that will go into the HTML page using PHP.
Are you trying to get a new page title from the server based on some "on server" processing? If YES, you can make it easier by having a variable defined in JavaScript; I'd suggest an anonymous object or out of GLOBAL scope, and make an AJAX call on a PHP script at the server.
Generating "in page" JavaScript is done all the time.
Although after the code generation is done, there is no longer a connection to the PHP script running on the server. YOU can get very sophisticated and replace JavaScript script tag contents on the fly; even via AJAX calls to a PHP script - as mentioned above.
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<html>
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<head>
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<title><?php echo $page_title?></title>
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<script type="text/javascript" src="<?php echo getScript()?>"></script>
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<script type="text/javascript">
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<?php
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// Generate a bunch of JavaScript code here...
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?>
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</script>
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</head>
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<body>
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</body>
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</html>
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