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."
<?php
define('PHP_QPRINT_MAXL', 75);
function leading_dot_fixed_php_quot_print_encode($str)
{
$lp = 0;
$ret = '';
$hex = "0123456789ABCDEF";
$length = strlen($str);
$str_index = 0;
while ($length--) {
if ((($c = $str[$str_index++]) == "\015") && ($str[$str_index] == "\012") && $length > 0) {
$ret .= "\015";
$ret .= $str[$str_index++];
$length--;
$lp = 0;
} else {
if (ctype_cntrl($c)
|| (ord($c) == 0x7f)
|| (ord($c) & 0x80)
|| ($c == '=')
|| (($c == ' ') && ($str[$str_index] == "\015")))
{
if (($lp += 3) > PHP_QPRINT_MAXL)
{
$ret .= '=';
$ret .= "\015";
$ret .= "\012";
$lp = 3;
}
$ret .= '=';
$ret .= $hex[ord($c) >> 4];
$ret .= $hex[ord($c) & 0xf];
}
else
{
if ((++$lp) > PHP_QPRINT_MAXL)
{
$ret .= '=';
$ret .= "\015";
$ret .= "\012";
$lp = 1;
}
$ret .= $c;
if($lp == 1 && $c == '.') {
$ret .= '.';
$lp++;
}
}
}
}
return $ret;
}
?>
quoted_printable_encode
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
quoted_printable_encode — Convierte un string de 8 bits en un string quoted-printable
Descripción
Devuelve un string quoted printable creado de acuerdo con su definición en » RFC2045, sección 6.7.
Esta función es similar a imap_8bit(), excepto que no requiere el módulo IMAP para funcionar.
Parámetros
-
str -
El string de entrada.
Valores devueltos
Devuelve el string codificado.
Ver también
- quoted_printable_decode() - Convierte un string quoted-printable en un string de 8 bits
- iconv_mime_encode() - Compone un campo de cabecera MIME
add a note
User Contributed Notes 6 notes
jurgen at edesign dot nl ¶
10 years ago
arnaudv6 ¶
13 years ago
One will like to know and clearly read that RFC2045 specifies a line shall not exceed 75 characters.
Accordingly, quoted_printable_encode() splits line at this limit.
ericth at NOSPAM dot pennyworth dot com ¶
13 years ago
I have re-written the PHP 5.3.8 function for quoted_printable_encode into PHP for use with PHP < 5.3. Tested with PHP 5.2.11.
<?php
define('PHP_QPRINT_MAXL', 75);
function php_quot_print_encode($str)
{
$lp = 0;
$ret = '';
$hex = "0123456789ABCDEF";
$length = strlen($str);
$str_index = 0;
while ($length--) {
if ((($c = $str[$str_index++]) == "\015") && ($str[$str_index] == "\012") && $length > 0) {
$ret .= "\015";
$ret .= $str[$str_index++];
$length--;
$lp = 0;
} else {
if (ctype_cntrl($c)
|| (ord($c) == 0x7f)
|| (ord($c) & 0x80)
|| ($c == '=')
|| (($c == ' ') && ($str[$str_index] == "\015")))
{
if (($lp += 3) > PHP_QPRINT_MAXL)
{
$ret .= '=';
$ret .= "\015";
$ret .= "\012";
$lp = 3;
}
$ret .= '=';
$ret .= $hex[ord($c) >> 4];
$ret .= $hex[ord($c) & 0xf];
}
else
{
if ((++$lp) > PHP_QPRINT_MAXL)
{
$ret .= '=';
$ret .= "\015";
$ret .= "\012";
$lp = 1;
}
$ret .= $c;
}
}
}
return $ret;
}
?>
marcus at synchromedia dot co dot uk ¶
7 years ago
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.
Thorsten Glaser ¶
14 years ago
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 .
'=' . $linebreak;
}
tzangerl [dot] pdc {dot} kth dot se ¶
14 years ago
A function that QP-encodes an input string (written for PHP < 5.3) and
wordwraps it at the same time, in order to avoid classification according to the MIME QP LONG LINE rule of SpamAssassin. Thanks for Matt Jeffers to point out errors in the below quoted_printable script!
<?php
function quoted_printable_encode($input, $line_max = 75) {
$hex = array('0','1','2','3','4','5','6','7',
'8','9','A','B','C','D','E','F');
$lines = preg_split("/(?:\r\n|\r|\n)/", $input);
$linebreak = "=0D=0A=\r\n";
/* the linebreak also counts as characters in the mime_qp_long_line
* rule of spam-assassin */
$line_max = $line_max - strlen($linebreak);
$escape = "=";
$output = "";
$cur_conv_line = "";
$length = 0;
$whitespace_pos = 0;
$addtl_chars = 0;
// iterate lines
for ($j=0; $j<count($lines); $j++) {
$line = $lines[$j];
$linlen = strlen($line);
// iterate chars
for ($i = 0; $i < $linlen; $i++) {
$c = substr($line, $i, 1);
$dec = ord($c);
$length++;
if ($dec == 32) {
// space occurring at end of line, need to encode
if (($i == ($linlen - 1))) {
$c = "=20";
$length += 2;
}
$addtl_chars = 0;
$whitespace_pos = $i;
} elseif ( ($dec == 61) || ($dec < 32 ) || ($dec > 126) ) {
$h2 = floor($dec/16); $h1 = floor($dec%16);
$c = $escape . $hex["$h2"] . $hex["$h1"];
$length += 2;
$addtl_chars += 2;
}
// length for wordwrap exceeded, get a newline into the text
if ($length >= $line_max) {
$cur_conv_line .= $c;
// read only up to the whitespace for the current line
$whitesp_diff = $i - $whitespace_pos + $addtl_chars;
/* the text after the whitespace will have to be read
* again ( + any additional characters that came into
* existence as a result of the encoding process after the whitespace)
*
* Also, do not start at 0, if there was *no* whitespace in
* the whole line */
if (($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 {
$output .= $cur_conv_line . $linebreak;
}
$cur_conv_line = "";
$length = 0;
$whitespace_pos = 0;
} else {
// length for wordwrap not reached, continue reading
$cur_conv_line .= $c;
}
} // end of for
$length = 0;
$whitespace_pos = 0;
$output .= $cur_conv_line;
$cur_conv_line = "";
if ($j<=count($lines)-1) {
$output .= $linebreak;
}
} // end for
return trim($output);
} // end quoted_printable_encode
?>
