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<?php
namespace Laminas\I18n\Filter;
use Laminas\Stdlib\StringUtils;
use Locale;
use function in_array;
use function is_array;
use function is_scalar;
use function preg_replace;
class Alpha extends Alnum
{
/**
* Defined by Laminas\Filter\FilterInterface
*
* Returns the string $value, removing all but alphabetic characters
*
* @param mixed $value
* @return ($value is scalar ? string : ($value is list<scalar> ? list<string> : mixed))
*/
public function filter($value)
{
if (! is_scalar($value) && ! is_array($value)) {
return $value;
}
$whiteSpace = $this->options['allow_white_space'] ? '\s' : '';
$language = Locale::getPrimaryLanguage($this->getLocale());
if (! StringUtils::hasPcreUnicodeSupport()) {
// POSIX named classes are not supported, use alternative [a-zA-Z] match
$pattern = '/[^a-zA-Z' . $whiteSpace . ']/';
} elseif (in_array($language, ['ja', 'ko', 'zh'], true)) {
// Use english alphabet
$pattern = '/[^a-zA-Z' . $whiteSpace . ']/u';
} else {
// Use native language alphabet
$pattern = '/[^\p{L}' . $whiteSpace . ']/u';
}
return preg_replace($pattern, '', $value);
}
}