I am a PHP beginner and saw on the forum this PHP expression:
My PHP version is 5.2.X ()
$regex = <<<'END'
/
( [\x00-\x7F] # single-byte sequences 0xxxxxxx
| [\xC0-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
| [\xE0-\xEF][\x80-\xBF]{2} # triple-byte sequences 1110xxxx 10xxxxxx * 2
| [\xF0-\xF7][\x80-\xBF]{3} # quadruple-byte sequence 11110xxx 10xxxxxx * 3
)
| ( [\x80-\xBF] ) # invalid byte in range 10000000 - 10111111
| ( [\xC0-\xFF] ) # invalid byte in range 11000000 - 11111111
/x
END;
Is this code correct? What do these strange (for me) constructions like <<<, 'END', /, /x, and END; mean?
My PHP version does not support nowdoc, how should I replace this expression? without quotes 'END' $regex became NULL
I recieve:
Parse error: syntax error, unexpected T_SL in /home/vhosts/mysite.com/public_html/mypage.php on line X
Thanks
Parse error: syntax error, unexpected T_SL in /home/vhosts/mysite.com/public_html/mypage.php on line X
This comes from the 's around END. This is called nowdoc, which was added in PHP 5.3. Since you're using PHP 5.2, and this regex uses '\x', you'll need a quoted string or you'll need to escape the '\'s.
An example of the regex as a quoted string, used in this answer:
$regex = '/
( [\x00-\x7F] # single-byte sequences 0xxxxxxx
| [\xC0-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx
| [\xE0-\xEF][\x80-\xBF]{2} # triple-byte sequences 1110xxxx 10xxxxxx * 2
| [\xF0-\xF7][\x80-\xBF]{3} # quadruple-byte sequence 11110xxx 10xxxxxx * 3
)
| ( [\x80-\xBF] ) # invalid byte in range 10000000 - 10111111
| ( [\xC0-\xFF] ) # invalid byte in range 11000000 - 11111111
/x
';
The "/" and "/x" portions are control characters in the regex. The "/"s mark the beginning and end, and the meaning of the x flag (PCRE_EXTENDED) is defined in: http://us.php.net/manual/en/reference.pcre.pattern.modifiers.php