Description:
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From manual page: http://www.php.net/function.parse-ini-file
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parse_ini_file and parse_ini_string try to interpret loogical operator inside not quoted strings.

If we have keys equal to unquoted strings with '|', '&', '^', or '!' inside, everything will be interpreted as numbers even if it was simple strings. 

Furthermore, if the string starts with a "dual" operator like '|', '&' or '^', php will say there is a syntax error. Same if we use '!' in the middle of a string.

That is with ZEND_INI_SCANNER_NORMAL.

With ZEND_INI_SCANNER_RAW, we don't have the problem, but we have ini files from Zend framework 1 where we have

test = ^foo "bar"

It was translated as '^foo bar'. With ZEND_INI_SCANNER_RAW, it becomes '^foo "bar"'. Which is not what we had with php5.4.

Test script:
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var_dump(parse_ini_string('test = foo & bar'));
var_dump(parse_ini_string('test = &foo'));

var_dump(parse_ini_string('test = foo | bar'));
var_dump(parse_ini_string('test = |foo'));

var_dump(parse_ini_string('test = foo ^ bar'));
var_dump(parse_ini_string('test = ^foo'));

var_dump(parse_ini_string('test = foo ! bar'));
var_dump(parse_ini_string('test = !foo'));

Expected result:
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If the text does not represent numbers, don't try to apply the operator.