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run code in 300+ PHP versions simultaneously
<?php $string = "Prüfung Prüfung"; $preferences = array( "input-charset" => "ISO-8859-1", "output-charset" => "UTF-8", "line-length" => 76, "line-break-chars" => "\n" ); $preferences["scheme"] = "Q"; echo iconv_mime_encode("Subject", $string, $preferences); echo "/n/n"; echo mb_encode_mimeheader("Subject: $string", "UTF-8", "Q");

preferences:
39.14 ms | 402 KiB | 5 Q