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<?php print preg_replace( '/([а-яё\.])/iu', idn_to_ascii( "$1" ), 'мой-сайт.рф' );
Output for 7.4.0 - 7.4.25, 7.4.27 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
мой-сайт.рф
Output for 7.3.32, 7.4.26, 7.4.33, 8.0.13
Fatal error: Uncaught Error: Call to undefined function idn_to_ascii() in /in/9aWvO:3 Stack trace: #0 {main} thrown in /in/9aWvO on line 3
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.3.33
Deprecated: idn_to_ascii(): INTL_IDNA_VARIANT_2003 is deprecated in /in/9aWvO on line 3 мой-сайт.рф

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