imap_utf7_decode

(PHP 4, PHP 5, PHP 7, PHP 8)

imap_utf7_decode — Decodes a modified UTF-7 encoded string

说明

imap_utf7_decode(string $string): string|false

Decodes modified UTF-7 string into ISO-8859-1 string.

This function is needed to decode mailbox names that contain certain characters which are not in range of printable ASCII characters.

参数

string: A modified UTF-7 encoding string, as defined in » RFC 2060, section 5.1.3.

返回值

Returns a string that is encoded in ISO-8859-1 and consists of the same sequence of characters in string, or false if string contains invalid modified UTF-7 sequence or string contains a character that is not part of ISO-8859-1 character set.

参见

imap_utf7_encode() - Converts ISO-8859-1 string to modified UTF-7 text

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Anonymous ¶

9 years ago

I can't find method for converting imap utf7 into utf8.
So I have to write several lines of code to solve this issue. May be this could be usefull. Here is no error handling but it could be added.

Usage:
$imap_utf7 = '[Gmail]/&BBIEMAQ2BD0EPgQ1-';
$utf8 =  ImapUtf7::decode($imap_utf7);
$imap_utf7_2 =  ImapUtf7::encode($utf8);

[ImapUtf7.php]
<?php
class ImapUtf7 {
    static $imap_base64 =
        'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,';
    static private function encode_b64imap($s) {    
        $a=0; $al=0; $res=''; $n=strlen($s);
        for($i=0;$i<$n;$i++) {
            $a=($a<<8)|ord($s[$i]); $al+=8;
            for(;$al>=6;$al-=6) $res.=self::$imap_base64[($a>>($al-6))&0x3F];
        }
        if ($al>0) { $res.=self::$imap_base64[($a<<(6-$al))&0x3F]; }
        return $res;
    }
    static private function encode_utf8_char($w) {
        if ($w&0x80000000) return '';
        if ($w&0xFC000000) $n=5; else
        if ($w&0xFFE00000) $n=4; else
        if ($w&0xFFFF0000) $n=3; else
        if ($w&0xFFFFF800) $n=2; else
        if ($w&0xFFFFFF80) $n=1; else return chr($w);
        $res=chr(( (255<<(7-$n)) | ($w>>($n*6)) )&255); 
        while(--$n>=0) $res.=chr((($w>>($n*6))&0x3F)|0x80);
        return $res;
    }
    static private function decode_b64imap($s) {
        $a=0; $al=0; $res=''; $n=strlen($s);
        for($i=0;$i<$n;$i++) {
            $k=strpos(self::$imap_base64,$s[$i]); if ($k===FALSE) continue;
            $a=($a<<6)|$k; $al+=6;
            if ($al>=8) { $res.=chr(($a>>($al-8))&255);$al-=8; }
        }
        $r2=''; $n=strlen($res);
        for($i=0;$i<$n;$i++) {
            $c=ord($res[$i]); $i++;
            if ($i<$n) $c=($c<<8) | ord($res[$i]);
            $r2.=self::encode_utf8_char($c);
        }
        return $r2;
    }
    static function encode($s) {
        $n=strlen($s);$err=0;$buf='';$res='';
        for($i=0;$i<$n;) {
            $x=ord($s[$i++]);
            if (($x&0x80)==0x00) { $r=$x;$w=0; } 
            else if (($x&0xE0)==0xC0) { $w=1; $r=$x &0x1F; } 
            else if (($x&0xF0)==0xE0) { $w=2; $r=$x &0x0F; } 
            else if (($x&0xF8)==0xF0) { $w=3; $r=$x &0x07; } 
            else if (($x&0xFC)==0xF8) { $w=4; $r=$x &0x03; } 
            else if (($x&0xFE)==0xFC) { $w=5; $r=$x &0x01; } 
            else if (($x&0xC0)==0x80) { $w=0; $r=-1; $err++; } 
            else { $w=0;$r=-2;$err++; }
            for($k=0;$k<$w && $i<$n; $k++) {
                $x=ord($s[$i++]); if ($x&0xE0!=0x80) { $err++; }
                $r=($r<<6)|($x&0x3F);
            }
            if ($r<0x20 || $r>0x7E ) {
                $buf.=chr(($r>>8)&0xFF); $buf.=chr($r&0xFF);
            } else {
                if (strlen($buf)) { 
                    $res.='&'.self::encode_b64imap($buf).'-';
                    $buf=''; 
                }
                if ($r==0x26) { $res.='&-'; } else $res.=chr($r);
            }
        }
        if (strlen($buf)) $res.='&'.self::encode_b64imap($buf).'-';
        return $res;
    }
    static function decode($s) {
        $res=''; $n=strlen($s); $h=0;
        while($h<$n) {
            $t=strpos($s,'&',$h); if ($t===false) $t=$n;
            $res.=substr($s,$h,$t-$h); $h=$t+1; if ($h>=$n) break;
            $t=strpos($s,'-',$h); if ($t===false) $t=$n;
            $k=$t-$h; 
            if ($k==0) $res.='&'; 
            else $res.=self::decode_b64imap(substr($s,$h,$k));
            $h=$t+1;
        }
        return $res;
    }
}

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Anonymous ¶

22 years ago

For "Outlook-style" UTF-7, you can also use:

mb_convert_encoding( $str, "ISO_8859-1", "UTF7-IMAP" ); # for decoding
mb_convert_encoding( $str, "UTF7-IMAP", "ISO_8859-1" ); # for encoding

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Min He ¶

14 years ago

For Chinese charset, we can use: 

mb_convert_encoding($mailbox, "UTF7-IMAP", "GB2312"); 

when you want to create a mailbox in Chinese. 

OR 

mb_convert_encoding($mailbox, "GB2312", "UTF7-IMAP");

when you want to show the listed mailbox with the right charset.

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-1

sven at planb dot de ¶

24 years ago

imap_utf7_decode decodes 'modified'.

For decoding Outlook UTF-7 - texts I use --enable-recode and $latin1string=recode_string("UTF-7..ISO_8859-1",$utf7string);

Don't use recode-3.5c.*rpm from Contrib.

recode_string seems to be buggy.