Description:
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I have reproduced this issue with PHP 7.0 stable and have since updated to:
PHP 7.0.2-dev (cli) (built: Dec  9 2015 20:09:53) ( NTS )


If you test the script below, you will see a parse error, "Invalid numeric literal".

Although, technically, the code used within highlight_string function below is indeed invalid, I don't believe this should actually manifest itself as a parse error. After all, you can throw pretty much anything in there, valid or invalid, and not otherwise get any problems, so a parse error here for this specific case seems unexpected.

Test script:
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<?php

$highlightedString = highlight_string("<?php \n 09;", true);
var_dump($highlightedString);

?>

Expected result:
----------------
The parse error should be suppressed.

Actual result:
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ParseError: Invalid numeric literal