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run code in 150+ php & hhvm versions
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<?php mb_internal_encoding('UTF-8'); echo 'Subject: ', mb_encode_mimeheader('Trois points à retenir sur votre abonnement Creative Cloud', 'UTF-8', 'B');
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Subject: Trois points =?UTF-8?B?w6AgcmV0ZW5pciBzdXIgdm90cmUgYWJvbm5lbWVudCBDcmVh?= =?UTF-8?B?dGl2ZSBDbG91ZA==?=