3v4l.org

run code in 300+ PHP versions simultaneously
<?php mb_internal_encoding('UTF-8'); echo 'Subject: ', mb_encode_mimeheader('☕ Ваш пригласительный на бизнес-завтрак с Пульсом цен', 'UTF-8', 'B');
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Subject: =?UTF-8?B?4piVINCS0LDRiCDQv9GA0LjQs9C70LDRgdC40YLQtdC70YzQvdGL0Lkg0L0=?= =?UTF-8?B?0LAg0LHQuNC30L3QtdGBLdC30LDQstGC0YDQsNC6INGBINCf0YPQu9GM0YE=?= =?UTF-8?B?0L7QvCDRhtC10L0=?=

preferences:
260.18 ms | 406 KiB | 353 Q