UtfNormalUtil.php File Reference

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Functions
	codepointToUtf8 ( $codepoint)
	Return UTF-8 sequence for a given Unicode code point. More...
	hexSequenceToUtf8 ( $sequence)
	Take a series of space-separated hexadecimal numbers representing Unicode code points and return a UTF-8 string composed of those characters. More...
	utf8ToHexSequence ( $str)
	Take a UTF-8 string and return a space-separated series of hex numbers representing Unicode code points. More...
	utf8ToCodepoint ( $char)
	Determine the Unicode codepoint of a single-character UTF-8 sequence. More...
	escapeSingleString ( $string)
	Escape a string for inclusion in a PHP single-quoted string literal. More...

Function Documentation

codepointToUtf8()

codepointToUtf8

(

$codepoint

)

Return UTF-8 sequence for a given Unicode code point.

May die if fed out of range data.

Parameters

$codepoint

Integer:

Returns

String

Definition at line 38 of file UtfNormalUtil.php.

                                       {
        if($codepoint <         0x80) return chr($codepoint);
        if($codepoint <    0x800) return chr($codepoint >>      6 & 0x3f | 0xc0) .
                                                                         chr($codepoint           & 0x3f | 0x80);
        if($codepoint <  0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
                                                                         chr($codepoint >>      6 & 0x3f | 0x80) .
                                                                         chr($codepoint           & 0x3f | 0x80);
        if($codepoint < 0x110000) return chr($codepoint >> 18 & 0x07 | 0xf0) .
                                                                         chr($codepoint >> 12 & 0x3f | 0x80) .
                                                                         chr($codepoint >>      6 & 0x3f | 0x80) .
                                                                         chr($codepoint           & 0x3f | 0x80);
 
        echo "Asked for code outside of range ($codepoint)\n";
        die( -1 );
}

escapeSingleString()

escapeSingleString

(

$string

)

Escape a string for inclusion in a PHP single-quoted string literal.

Parameters

$string

String: string to be escaped.

Returns

String: escaped string.

Definition at line 138 of file UtfNormalUtil.php.

                                       {
        return strtr( $string,
                array(
                        '\\' => '\\\\',
                        '\'' => '\\\''
                ));
}

hexSequenceToUtf8()

hexSequenceToUtf8 (   $sequence )

private

Take a series of space-separated hexadecimal numbers representing Unicode code points and return a UTF-8 string composed of those characters.

Used by UTF-8 data generation and testing routines.

Parameters

$sequence

String

Returns

String

Definition at line 63 of file UtfNormalUtil.php.

                                        {
        $utf = '';
        foreach( explode( ' ', $sequence ) as $hex ) {
                $n = hexdec( $hex );
                $utf .= codepointToUtf8( $n );
        }
        return $utf;
}

References $n, and codepointToUtf8().

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utf8ToCodepoint()

utf8ToCodepoint

(

$char

)

Determine the Unicode codepoint of a single-character UTF-8 sequence.

Does not check for invalid input data.

Parameters

$char

String

Returns

Integer

Definition at line 98 of file UtfNormalUtil.php.

                                  {
        # Find the length
        $z = ord( $char{0} );
        if ( $z & 0x80 ) {
                $length = 0;
                while ( $z & 0x80 ) {
                        $length++;
                        $z <<= 1;
                }
        } else {
                $length = 1;
        }
 
        if ( $length != strlen( $char ) ) {
                return false;
        }
        if ( $length == 1 ) {
                return ord( $char );
        }
 
        # Mask off the length-determining bits and shift back to the original location
        $z &= 0xff;
        $z >>= $length;
 
        # Add in the free bits from subsequent bytes
        for ( $i=1; $i<$length; $i++ ) {
                $z <<= 6;
                $z |= ord( $char{$i} ) & 0x3f;
        }
 
        return $z;
}

utf8ToHexSequence()

utf8ToHexSequence (   $str )

private

Take a UTF-8 string and return a space-separated series of hex numbers representing Unicode code points.

For debugging.

Parameters

$str	String: UTF-8 string.

Returns

string

Definition at line 80 of file UtfNormalUtil.php.

                                   {
        return rtrim( preg_replace_callback(
        '/(.)/uS',
        function($hit) {
            return sprintf("%04x ", utf8ToCodepoint($hit[1]));
        },
        $str
    ));
}

References utf8ToCodepoint().

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