Description:
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When compiling a simple include_once or require_once with a part of path in it, and not just the file name, i.e. when an included files resides in a lower directory, this path gets replaced by the original source file location at compile time.
I.e. if you put your source PHP file in /var/www/htdocs/tocompile
and compile that file with "bcompile_write_header/file/footer()" and save it to /var/www/htdocs/compiled, any include/require_once(and possibly others) will try and refference files in /var/www/htdocs/tocompile.

Bellow is a simple file I've created and tested.

Reproduce code:
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<? require_once('inc/test.php'); echo $test_value; ?>

Compiled with:
$fhandle = fopen(compiled/testing.php, 'w');
bcompiler_write_header($fhandle);
bcompiler_write_file($fhandle, tocompile/testing.php);
bcompiler_write_footer($fhandle);
fclose($fhandle);

Expected result:
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After above compile, the compiled script should produce an error, because there was no "compiled/inc/test.php" file available.

Actual result:
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After removing inc/test.php file from "tocompile" directory, it produced an error, file or directory not found with path to "tocompile/inc/test.php"