Description:
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http://php.net/manual/en/language.basic-syntax.phpmode.php says "when the PHP interpreter hits the ?> closing tags, it simply starts outputting whatever it finds (except for an immediately following newline - see instruction separation) until it hits another opening tag", but it seems a carriage return character is also not printed, if encountered. but it is apparently not documented. (ps, i tested this both on a linux system and a windows system, the result is the same on both.)

Test script:
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<?php
$tmp=tmpfile();
fwrite($tmp,"<?php ?>\r");
ob_start();
require(stream_get_meta_data($tmp)['uri']);
var_dump(bin2hex(ob_get_clean()));



Expected result:
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string(2) "0d"

Actual result:
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string(0) ""