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<?php function validate($value): void { preg_match_all('/<([a-zA-Z0-9]+)(\s[^>]*)?>/i', $value, $matches); $invalidTags = array_filter($matches[1], fn($tag) => !in_array(strtolower($tag), $this->allowed)); $invalidTags = array_filter($matches[1], fn ($tag) => !in_array(strtolower($tag), $this->allowed)); if (!empty($invalidTags)) { die($value); } } validate('lkdsjkfj <br /> dflkjdfkl <br>');
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