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<?php var_dump(idn_to_ascii('weißenbach', \IDNA_NONTRANSITIONAL_TO_ASCII, \INTL_IDNA_VARIANT_UTS46));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
string(17) "xn--weienbach-i1a"
preferences:
109.21 ms | 402 KiB | 91 Q