quoted_printable_encode

(PHP 5 >= 5.3.0)

quoted_printable_encode — Converte uma string de 8 bits em uma string quoted-printable

Descrição

string quoted_printable_encode ( string $str )

Retorna uma string quoted-printable criada de acordo com » RFC2045, seção 6.7.

Esta função é similar a imap_8bit(), exceto que essa não requer o módulo IMAP para funcionar.

Parâmetros

str: A string de entrada.

Valor Retornado

Retorna a string codificada.

Veja Também

quoted_printable_decode() - Converte uma string quoted-printable para uma string de 8 bit

add a note User Contributed Notes
quoted_printable_encode

tzangerl (at) pdc {dot} kth [dot] se
17-Nov-2009 02:16


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);

}

?>

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quotemeta

quoted_printable_decode

Last updated: Fri, 13 Nov 2009