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<?php $header = 'X-My-Header: =?us-ascii?Q?hello_world?='; var_dump( mb_decode_mimeheader($header), iconv_mime_decode($header) );
Output for 7.1.25 - 7.1.32, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.3.33, 7.4.0 - 7.4.25, 7.4.27 - 7.4.30, 8.0.0 - 8.0.12, 8.0.14 - 8.0.22, 8.1.0 - 8.1.9
string(24) "X-My-Header: hello_world" string(24) "X-My-Header: hello world"
Output for 7.3.32, 7.4.26, 8.0.13
Fatal error: Uncaught Error: Call to undefined function iconv_mime_decode() in /in/6TlQs:6 Stack trace: #0 {main} thrown in /in/6TlQs on line 6
Process exited with code 255.

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