php substr() function with utf-8 leaves � marks at the end

Question

Here is simple code

Answer 1

Never use constant in substr function for UTF-8 string:

$st = substr($text, $beg, 100);

50% chance you will get half of a character at end of the string.

Do it like this:

$postion_degin = strpos($text, $first_symbol);
$postion_end = strpos($text, $last_symbol);
$len = $postion_end - $postion_degin + 1;
$st = substr($text, $postion_degin, $len);

100% safe result.

No mb_substr.