quoted_printable_encode()

(PHP 5 >= 5.3.0, PHP 7)

将 8-bit 字符串转换成 quoted-printable 字符串

说明

返回 quoted-printable 格式的字符，该格式由» RFC20456.7.章节里制定。

该函数与imap_8bit()函数十分相似，不同的是该函数不需要 IMAP 模块就能运行。

参数

输入的字符串。

返回值

返回编码之后的字符串。

参见

• quoted_printable_decode()将 quoted-printable 字符串转换为 8-bit 字符串
• iconv_mime_encode()Composes a MIME header field

Both PHP's native implementation and the function of ericth at NOSPAM dot pennyworth dot com (below) contain an feature/error (usage for SMTP mismatch) which has been solved in my adjustment below.
The error causes a text containing period character(s), when passed through these functions, end up with encoded lines starting with a period character, the first period character on that line will be discarded when it is transported over SMTP.
Solution: add (another) leading '.' to period characters which would end up as first character on a line when encoded.
See http://stackoverflow.com/a/13949483: "This is a dirty artifact of your transport layer... SMTP is the most probable culprit (see the call for caution in the mail function documentation) but there may be other low level mecanisms that behave similarly. For example if you tweaked the sendmail_path setting or use a buggy sendmail program you may experience similar woes."

I have re-written the PHP 5.3.8 function for quoted_printable_encode into PHP for use with PHP 
Two bugs:
1) your linebreak is wrong
        $linebreak = "\r\n";
2) continuation of lines with no whitespace is broken
                    /*
                     * the text after the whitespace will have to 
                     * be read again ( + any additional characters
                     * that came into existence as a result of the
                     * encoding process after the whitespace)
                     *
                     * Also, do not start at 0, if there was *no*
                     * whitespace in the whole line
                     */
                    if (($i + $addtl_chars) > $whitesp_diff) { 
                        $output .= substr($cur_conv_line, 0,
                          (strlen($cur_conv_line) - $whitesp_diff)) .
                          $linebreak;
                        $i = $i - $whitesp_diff + $addtl_chars;
                    } else {
                        /* emit continuation --mirabilos */
                        $output .= $cur_conv_line .
                          '=' . $linebreak;
                    }
One will like to know and clearly read that RFC2045 specifies a line shall not exceed 75 characters.
Accordingly, quoted_printable_encode() splits line at this limit.
A function that QP-encodes an input string (written for PHP 
Note that this function returns the quoted-printable string with Windows / RFC822 CRLF line breaks. If you're passing the output of this function into mail(), you may need to convert its line breaks to Unix LF style first.
 

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