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PHP – Encode string for MIME header using mb_encode_mimeheader()
In PHP, mb_encode_mimeheader() function is used to encode a string for MIME (Multipurpose Internet Mail Extensions) header. It encodes a given string by the MIME header encoding scheme.
Syntax
string mb_encode_mimeheader(str $string, str $charset, str $transfer_encoding, str $newLine, int $indent)
Parameters
The mb_encode_mimeheader() function accepts five parameters −
$string − This parameter is used to encode the string. Its encoding should be the same as mb_internal_encoding()
$charset − This parameter specifies the character set name in which the string is represented.
$transfer_encoding − This parameter specifies the scheme of MIME encoding. It should be base64 (B) or Quoted-printable (Q). If not given, then it falls back to base64 (B).
$newLine − This parameter specifies the end-of-line (EOL) marker with which mb_encode_mimeheader() performs line-folding.
$indent − It is used for the indentation of the first line.
Return Values
It returns a converted version of the string that is represented in ASCII.
Example 1
<?php $name = "Online tutorials"; $mbox = "nru"; $doma = "gtin.thu"; $addr = mb_encode_mimeheader($name,"UTF-7","Q")." <".$mbox."@".$doma.">"; echo $addr; ?>
Output
Online tutorials
Example 2
<?php $string = "\xe2\x86\x92"; mb_internal_encoding( "UTF-8"); echo mb_encode_mimeheader($string, 'UTF-8'); ?>
Output
=?UTF-8?B?4oaS?=
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