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namespace	utf8

Fonctions
	utf8_is_valid ($str)
	utf8_compliant ($str)

Documentation des fonctions

utf8_compliant ( $str )

Définition à la ligne 175 du fichier validation.php.

                              {
    if ( strlen($str) == 0 ) {
        return TRUE;
    }
    // If even just the first character can be matched, when the /u
    // modifier is used, then it's valid UTF-8. If the UTF-8 is somehow
    // invalid, nothing at all will match, even if the string contains
    // some valid sequences
    return (preg_match('/^.{1}/us',$str,$ar) == 1);
}

utf8_is_valid ( $str )

End of the multi-octet sequence. mUcs4 now contains the final Unicode codepoint to be output

((0xC0 & (*in) != 0x80) && (mState != 0)) Incomplete multi-octet sequence.

Définition à la ligne 32 du fichier validation.php.

                             {
    $mState = 0;     // cached expected number of octets after the current octet
                     // until the beginning of the next UTF8 character sequence
    $mUcs4  = 0;     // cached Unicode character
    $mBytes = 1;     // cached expected number of octets in the current sequence
    $len = strlen($str);
    for($i = 0; $i < $len; $i++) {
        $in = ord($str{$i});
        if ( $mState == 0) {
            // When mState is zero we expect either a US-ASCII character or a
            // multi-octet sequence.
            if (0 == (0x80 & ($in))) {
                // US-ASCII, pass straight through.
                $mBytes = 1;
            } else if (0xC0 == (0xE0 & ($in))) {
                // First octet of 2 octet sequence
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x1F) << 6;
                $mState = 1;
                $mBytes = 2;
            } else if (0xE0 == (0xF0 & ($in))) {
                // First octet of 3 octet sequence
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x0F) << 12;
                $mState = 2;
                $mBytes = 3;
            } else if (0xF0 == (0xF8 & ($in))) {
                // First octet of 4 octet sequence
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x07) << 18;
                $mState = 3;
                $mBytes = 4;
            } else if (0xF8 == (0xFC & ($in))) {
                /* First octet of 5 octet sequence.
                *
                * This is illegal because the encoded codepoint must be either
                * (a) not the shortest form or
                * (b) outside the Unicode range of 0-0x10FFFF.
                * Rather than trying to resynchronize, we will carry on until the end
                * of the sequence and let the later error handling code catch it.
                */
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 0x03) << 24;
                $mState = 4;
                $mBytes = 5;
            } else if (0xFC == (0xFE & ($in))) {
                // First octet of 6 octet sequence, see comments for 5 octet sequence.
                $mUcs4 = ($in);
                $mUcs4 = ($mUcs4 & 1) << 30;
                $mState = 5;
                $mBytes = 6;
            } else {
                /* Current octet is neither in the US-ASCII range nor a legal first
                 * octet of a multi-octet sequence.
                 */
                return FALSE;
            }
        } else {
            // When mState is non-zero, we expect a continuation of the multi-octet
            // sequence
            if (0x80 == (0xC0 & ($in))) {
                // Legal continuation.
                $shift = ($mState - 1) * 6;
                $tmp = $in;
                $tmp = ($tmp & 0x0000003F) << $shift;
                $mUcs4 |= $tmp;
                /**
                * End of the multi-octet sequence. mUcs4 now contains the final
                * Unicode codepoint to be output
                */
                if (0 == --$mState) {
                    /*
                    * Check for illegal sequences and codepoints.
                    */
                    // From Unicode 3.1, non-shortest form is illegal
                    if (((2 == $mBytes) && ($mUcs4 < 0x0080)) ||
                        ((3 == $mBytes) && ($mUcs4 < 0x0800)) ||
                        ((4 == $mBytes) && ($mUcs4 < 0x10000)) ||
                        (4 < $mBytes) ||
                        // From Unicode 3.2, surrogate characters are illegal
                        (($mUcs4 & 0xFFFFF800) == 0xD800) ||
                        // Codepoints outside the Unicode range are illegal
                        ($mUcs4 > 0x10FFFF)) {
                        return FALSE;
                    }
                    //initialize UTF8 cache
                    $mState = 0;
                    $mUcs4  = 0;
                    $mBytes = 1;
                }
            } else {
                /**
                *((0xC0 & (*in) != 0x80) && (mState != 0))
                * Incomplete multi-octet sequence.
                */
                return FALSE;
            }
        }
    }
    return TRUE;
}

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Fonctions

Documentation des fonctions