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Under PHP 7.2, calling `idn_to_ascii($idn)` results in a deprecation warning: 'INTL_IDNA_VARIANT_2003 is deprecated' See https://secure.php.net/manual/en/function.idn-to-ascii.php Therefore, if possible, `idn_to_ascii($idn, 0, INTL_IDNA_VARIANT_UTS46)` should be used instead. `INTL_IDNA_VARIANT_UTS46` was introduced in PHP 5.4, so on versions before that, `idn_to_ascii($idn)` must still be used. Fixed #1699