trait.ilBibliographicSecureString.php

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<?php
trait ilBibliographicSecureString
{
    protected function secure(string $string): string
    {
        return htmlspecialchars(
            strip_tags(
                (string) preg_replace('#\p{C}+#u', '', $string)
            ),
            ENT_QUOTES,
            'UTF-8',
            false
        );
    }
}