function _text_captcha_utf8_split in CAPTCHA Pack 8
Same name and namespace in other branches
- 5 text_captcha/text_captcha.inc \_text_captcha_utf8_split()
- 6 text_captcha/text_captcha.inc \_text_captcha_utf8_split()
- 7 text_captcha/text_captcha.inc \_text_captcha_utf8_split()
Helper function for splitting an utf8 string correctly in characters.
Assumes the given utf8 string is well formed. See http://en.wikipedia.org/wiki/Utf8 for more info.
4 calls to _text_captcha_utf8_split()
- css_captcha_captcha in css_captcha/
css_captcha.module - Implements hook_captcha().
- lost_character_captcha_captcha in text_captcha/
modules/ lost_character_captcha/ lost_character_captcha.module - Implements hook_captcha().
- lost_character_process in text_captcha/
modules/ lost_character_captcha/ lost_character_captcha.module - Process the response before validation.
- _text_captcha_word_pool_validate_word_length in text_captcha/
text_captcha.module - Validates word length.
File
- text_captcha/
text_captcha.module, line 26 - Contains general functionality for the module.
Code
function _text_captcha_utf8_split($str) {
$characters = [];
$len = strlen($str);
for ($i = 0; $i < $len;) {
$chr = ord($str[$i]);
// One byte character (0zzzzzzz)
if (($chr & 0x80) == 0x0) {
$width = 1;
}
else {
// Two byte character (first byte: 110yyyyy)
if (($chr & 0xe0) == 0xc0) {
$width = 2;
}
elseif (($chr & 0xf0) == 0xe0) {
$width = 3;
}
elseif (($chr & 0xf8) == 0xf0) {
$width = 4;
}
else {
\Drupal::logger('CAPTCHA')
->error('Encountered an illegal byte while splitting an utf8 string in characters.');
return $characters;
}
}
$characters[] = substr($str, $i, $width);
$i += $width;
}
return $characters;
}