quoted_printable_decode
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:
<?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;
$addtl_chars = 0;
for ($j=0; $j<count($lines); $j++) {
$line = $lines[$j];
$linlen = strlen($line);
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;
$output .= substr($cur_conv_line, 0,
(strlen($cur_conv_line) - $whitesp_diff)) .
$linebreak;
/* 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) */
$i = $i - $whitesp_diff + $addtl_chars;
$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 .= $linebreak;
}
}
return trim($output);
}
?>
quoted_printable_encode
(PHP 5 >= 5.3.0)
quoted_printable_encode — Convert a 8 bit string to a quoted-printable string
Description
string quoted_printable_encode
( string $str
)
Returns a quoted printable string created according to » RFC2045, section 6.7.
This function is similar to imap_8bit(), except this one does not require the IMAP module to work.
Parameters
- str
-
The input string.
Return Values
Returns the encoded string.
See Also
- quoted_printable_decode() - Convert a quoted-printable string to an 8 bit string
- iconv_mime_encode() - Composes a MIME header field
add a note
User Contributed Notesquoted_printable_encode
tzangerl (at) pdc {dot} kth [dot] se
17-Nov-2009 02:16
17-Nov-2009 02:16