The quoted_printable_encode() function in PHP 8.5 and PHP 8.5 (assuming you meant PHP 8.5 and an earlier version like 8.4) operates exactly the same as it always has. Its core purpose is to convert an 8-bit string into a quoted-printable format, which is primarily used for safely transmitting email content containing non-ASCII characters (like é, ö) or special symbols.
Functionality
The function encodes strings according to RFC 2045, section 6.7. It converts non-ASCII bytes and the equals sign (=) into a safe =XX hex format. It also automatically inserts soft line breaks (= ) to ensure lines do not exceed the 75-character limit required by the standard.
Basic Usage Example
This example from the official PHP documentation demonstrates encoding and decoding a German phrase:
<?php
$encoded = quoted_printable_encode( Möchten Sie ein paar Äpfel? );
var_dump($encoded);
// Output: string(37) "M=C3=B6chten Sie ein paar =C3=84pfel?"var_dump(quoted_printable_decode($encoded));
// Output: string(29) "Möchten Sie ein paar Äpfel?"
?>