Php символ по его коду

Php символ по его коду

chr — Генерирует односимвольную строку по заданному числу

Описание

Возвращает строку из одного символа, код которого задан аргументом codepoint , который интерпретируется как беззнаковое целое (unsigned integer).

Может использоваться для создания строки из одного символа однобайтовой кодировки, например, такой как ASCII, ISO-8859 или Windows 1252, путем указания позиции этого символа в таблице кодировки. Данная функция не подходит для генерации односимвольной строки в многобайтовых кодировках, таких как UTF-8 или UTF-16.

Эта функция дополняет функцию ord() .

Список параметров

Значения за пределом диапазона (0..255) должны быть побитово сложены (побитовое И) с 255, что соответствует такому алгоритму:

Возвращаемые значения

Строка из одного символа, содержащая заданный байт.

Список изменений

Версия	Описание
7.4.0	Функция больше не принимает неподдерживаемые значения codepoint и преобразует их в 0 .

Примеры

Пример #1 Пример использования chr()

// Предполагается, что строка будет использовака как ASCII или ASCII-совместимая

$str = «Эта строка заканчивается на escape: » ;
$str .= chr ( 27 ); /* добавляет символ escape в конец $str */

/* Но обычно лучше использовать такую конструкцию */

$str = sprintf ( «Эта строка заканчивается на escape: %c» , 27 );
?>

Пример #2 Поведение при переполнении

Результат выполнения данного примера:

Пример #3 Создание строки UTF-8 из индивидуальных байтов

Результат выполнения данного примера:

Источник

Php символ по его коду

chr — Generate a single-byte string from a number

Description

Returns a one-character string containing the character specified by interpreting codepoint as an unsigned integer.

This can be used to create a one-character string in a single-byte encoding such as ASCII, ISO-8859, or Windows 1252, by passing the position of a desired character in the encoding’s mapping table. However, note that this function is not aware of any string encoding, and in particular cannot be passed a Unicode code point value to generate a string in a multibyte encoding like UTF-8 or UTF-16.

This function complements ord() .

Parameters

An integer between 0 and 255.

Values outside the valid range (0..255) will be bitwise and’ed with 255, which is equivalent to the following algorithm:

Return Values

A single-character string containing the specified byte.

Changelog

Version	Description
7.4.0	The function no longer silently accepts unsupported codepoint s, and casts these to 0 .

Examples

Example #1 chr() example

// Assumes the string will be used as ASCII or an ASCII-compatible encoding

$str = «The string ends in escape: » ;
$str .= chr ( 27 ); /* add an escape character at the end of $str */

/* Often this is more useful */

$str = sprintf ( «The string ends in escape: %c» , 27 );
?>

Example #2 Overflow behavior

The above example will output:

Example #3 Building a UTF-8 string from individual bytes

The above example will output:

See Also

• sprintf() — Return a formatted string with a format string of %c
• ord()
• An » ASCII-table
• mb_chr()
• IntlChar::chr()

User Contributed Notes 23 notes

Note that if the number is higher than 256, it will return the number mod 256.
For example :
chr(321)=A because A=65(256)

Another quick and short function to get unicode char by its code.

/**
* Return unicode char by its code
*
* @param int $u
* @return char
*/
function unichr ( $u ) return mb_convert_encoding ( ‘&#’ . intval ( $u ) . ‘;’ , ‘UTF-8’ , ‘HTML-ENTITIES’ );
>
?>

for ( $i = 128 ; $i $str = chr ( 240 ) . chr ( 159 ) . chr ( 144 ) . chr ( $i );
echo $str ;
>

I spent hours looking for a function which would take a numeric HTML entity value and output the appropriate UTF-8 bytes. I found this at another site and only had to modify it slightly; so I don’t take credit for this.

if ( $dec < 128 ) <
$utf = chr ( $dec );
> else if ( $dec < 2048 ) <
$utf = chr ( 192 + (( $dec — ( $dec % 64 )) / 64 ));
$utf .= chr ( 128 + ( $dec % 64 ));
> else <
$utf = chr ( 224 + (( $dec — ( $dec % 4096 )) / 4096 ));
$utf .= chr ( 128 + ((( $dec % 4096 ) — ( $dec % 64 )) / 64 ));
$utf .= chr ( 128 + ( $dec % 64 ));
>
return $utf ;
> ?>

So for example:

Here is a sample of encoding and decoding using «chr» and «ord».
function Encode ( $txtData , $Level ) for ( $j = 0 ; $j < $Level ; $j ++)$tmpStr = '' ;
for ( $i = 0 ; $i < strlen ( $txtData ); $i ++)
$tmpStr .= ord ( substr ( strtoupper ( $txtData ), $i , 1 ));
$txtData = $tmpStr ;
>
return ( strlen ( $Level )). $Level . $txtData ;
>

function Decode ( $txtData ) $intLevel = substr ( $txtData , 1 , substr ( $txtData , 0 , 1 ));
$startStr = substr ( $txtData , substr ( $txtData , 0 , 1 )+ 1 , strlen ( $txtData ));
for ( $j = 0 ; $j < $intLevel ; $j ++)for ( $i = 0 ; $i < strlen ( $startStr ); $i += 2 )
$tmpStr .= chr ( intval ( substr ( $startStr , $i , 2 )));
$startStr = $tmpStr ;

$tmpStr = «» ;
>
return $startStr ;
>

echo Encode ( ‘123’ , 4 ). ‘
‘ ;
echo Decode ( Encode ( ‘123’ , 5 ));
?>

Want terminal colors in command line php scripts?

This should take care of that.

$_colors = array(
‘LIGHT_RED’ => «[1;31m»,
‘LIGHT_GREEN’ => «[1;32m»,
‘YELLOW’ => «[1;33m»,
‘LIGHT_BLUE’ => «[1;34m»,
‘MAGENTA’ => «[1;35m»,
‘LIGHT_CYAN’ => «[1;36m»,
‘WHITE’ => «[1;37m»,
‘NORMAL’ => «[0m»,
‘BLACK’ => «[0;30m»,
‘RED’ => «[0;31m»,
‘GREEN’ => «[0;32m»,
‘BROWN’ => «[0;33m»,
‘BLUE’ => «[0;34m»,
‘CYAN’ => «[0;36m»,
‘BOLD’ => «[1m»,
‘UNDERSCORE’ => «[4m»,
‘REVERSE’ => «[7m»,

function termcolored($text, $color=»NORMAL», $back=1) <
global $_colors;
$out = $_colors[«$color»];
if($out == «») < $out = "[0m"; >
if($back) <
return chr(27).»$out$text».chr(27).chr(27).»[0m».chr(27);
>else <
echo chr(27).»$out$text».chr(27).chr(27).»[0m».chr(27);
>//fi
>// end function

echo termcolored(«test\n», «BLUE»);
?>

// rivencodec 1.0
// encode riverse ascii 1 simple function can encode/decode
// can use it for secure source with speed encode text

function rivencodec ( $ch , $a = 0 ) while((@ $b = $ch [ $a ++])) < $ch [ $a - 1 ] = chr ( 255 - ord ( $b )); >
return $ch ;
>

$zz = rivencodec ( «abcdefghijklmn» );
echo ‘encode: ‘ , $zz , ‘
‘ , PHP_EOL ;

$yy = rivencodec ( $zz );
echo ‘decode: ‘ , $yy , ‘
‘ , PHP_EOL ;

In addition to replacing Microsoft Windows smart quotes, as sgaston demonstrated on 2006-02-13, I replace all other Microsoft Windows characters using suggestions[1] published by character code specialist[2] Jukka Korpela.

$str = str_replace ( chr ( 130 ), ‘,’ , $str ); // baseline single quote
$str = str_replace ( chr ( 131 ), ‘NLG’ , $str ); // florin
$str = str_replace ( chr ( 132 ), ‘»‘ , $str ); // baseline double quote
$str = str_replace ( chr ( 133 ), ‘. ‘ , $str ); // ellipsis
$str = str_replace ( chr ( 134 ), ‘**’ , $str ); // dagger (a second footnote)
$str = str_replace ( chr ( 135 ), ‘***’ , $str ); // double dagger (a third footnote)
$str = str_replace ( chr ( 136 ), ‘^’ , $str ); // circumflex accent
$str = str_replace ( chr ( 137 ), ‘o/oo’ , $str ); // permile
$str = str_replace ( chr ( 138 ), ‘Sh’ , $str ); // S Hacek
$str = str_replace ( chr ( 139 ), ‘ $str = str_replace ( chr ( 140 ), ‘OE’ , $str ); // OE ligature
$str = str_replace ( chr ( 145 ), «‘» , $str ); // left single quote
$str = str_replace ( chr ( 146 ), «‘» , $str ); // right single quote
$str = str_replace ( chr ( 147 ), ‘»‘ , $str ); // left double quote
$str = str_replace ( chr ( 148 ), ‘»‘ , $str ); // right double quote
$str = str_replace ( chr ( 149 ), ‘-‘ , $str ); // bullet
$str = str_replace ( chr ( 150 ), ‘-‘ , $str ); // endash
$str = str_replace ( chr ( 151 ), ‘—‘ , $str ); // emdash
$str = str_replace ( chr ( 152 ), ‘~’ , $str ); // tilde accent
$str = str_replace ( chr ( 153 ), ‘(TM)’ , $str ); // trademark ligature
$str = str_replace ( chr ( 154 ), ‘sh’ , $str ); // s Hacek
$str = str_replace ( chr ( 155 ), ‘>’ , $str ); // right single guillemet
$str = str_replace ( chr ( 156 ), ‘oe’ , $str ); // oe ligature
$str = str_replace ( chr ( 159 ), ‘Y’ , $str ); // Y Dieresis
?>

[1] On the use of some MS Windows characters in HTML
http://www.cs.tut.fi/~jkorpela/www/windows-chars.html

Secure password generator with a variable maximum amount of symbols.

function passwdGen ( $minLength = 8 , $maxLength = 12 , $maxSymbols = 2 )
$symbolCount = 0 ;

srand ((double) microtime () * 1000003 );

$passwd = sprintf ( ‘%s%c’ , isset( $passwd ) ? $passwd : NULL , $char );
>

Источник

Php символ по его коду

ord — Convert the first byte of a string to a value between 0 and 255

Description

Interprets the binary value of the first byte of character as an unsigned integer between 0 and 255.

If the string is in a single-byte encoding, such as ASCII, ISO-8859, or Windows 1252, this is equivalent to returning the position of a character in the character set’s mapping table. However, note that this function is not aware of any string encoding, and in particular will never identify a Unicode code point in a multi-byte encoding such as UTF-8 or UTF-16.

This function complements chr() .

Parameters

Return Values

An integer between 0 and 255.

Examples

Example #1 ord() example

Example #2 Examining the individual bytes of a UTF-8 string

declare( encoding = ‘UTF-8’ );
$str = «🐘» ;
for ( $pos = 0 ; $pos < strlen ( $str ); $pos ++ ) $byte = substr ( $str , $pos );
echo ‘Byte ‘ . $pos . ‘ of $str has value ‘ . ord ( $byte ) . PHP_EOL ;
>
?>

The above example will output:

Byte 0 of $str has value 240
Byte 1 of $str has value 159
Byte 2 of $str has value 144
Byte 3 of $str has value 152

See Also

• chr() — Generate a single-byte string from a number
• An » ASCII-table
• mb_ord() — Get Unicode code point of character
• IntlChar::ord() — Return Unicode code point value of character

User Contributed Notes 6 notes

As ord() doesn’t work with utf-8, and if you do not have access to mb_* functions, the following function will work well:
function ordutf8 ( $string , & $offset ) $code = ord ( substr ( $string , $offset , 1 ));
if ( $code >= 128 ) < //otherwise 0xxxxxxx
if ( $code < 224 ) $bytesnumber = 2 ; //110xxxxx
else if ( $code < 240 ) $bytesnumber = 3 ; //1110xxxx
else if ( $code < 248 ) $bytesnumber = 4 ; //11110xxx
$codetemp = $code — 192 — ( $bytesnumber > 2 ? 32 : 0 ) — ( $bytesnumber > 3 ? 16 : 0 );
for ( $i = 2 ; $i <= $bytesnumber ; $i ++) $offset ++;
$code2 = ord ( substr ( $string , $offset , 1 )) — 128 ; //10xxxxxx
$codetemp = $codetemp * 64 + $code2 ;
>
$code = $codetemp ;
>
$offset += 1 ;
if ( $offset >= strlen ( $string )) $offset = — 1 ;
return $code ;
>
?>
$offset is a reference, as it is not easy to split a utf-8 char-by-char. Useful to iterate on a string:
$text = «abcàê߀abc» ;
$offset = 0 ;
while ( $offset >= 0 ) echo $offset . «: » . ordutf8 ( $text , $offset ). «\n» ;
>
/* returns:
0: 97
1: 98
2: 99
3: 224
5: 234
7: 223
9: 8364
12: 97
13: 98
14: 99
*/
?>
Feel free to adapt my code to fit your needs.

Regarding character sets, and whether or not this is «ASCII». Firstly, there is no such thing as «8-bit ASCII», so if it were ASCII it would only ever return integers up to 127. 8-bit ASCII-compatible encodings include the ISO 8859 family of encodings, which map various common characters to the values from 128 to 255. UTF-8 is also designed so that characters representable in 7-bit ASCII are coded the same; byte values higher than 127 in a UTF-8 string represent the beginning of a multi-byte character.

In fact, like most of PHP’s string functions, this function isn’t doing anything to do with character encoding at all — it is just interpreting a binary byte from a string as an unsigned integer. That is, ord(chr(200)) will always return 200, but what character chr(200) *means* will vary depending on what character encoding it is *interpreted* as part of (e.g. during display).

A technically correct description would be «Returns an integer representation of the first byte of a string, from 0 to 255. For single-byte encodings such as (7-bit) ASCII and the ISO 8859 family, this will correspond to the first character, and will be the position of that character in the encoding’s mapping table. For multi-byte encodings, such as UTF-8 or UTF-16, the byte may not represent a complete character.»

The link to asciitable.com should also be replaced by one which explains what character encoding it is displaying, as «Extended ASCII» is an ambiguous and misleading name.

Источник

PHP chr() Function

The chr() function returns a character from the specified ASCII value.

The ASCII value can be specified in decimal, octal, or hex values. Octal values are defined by a leading 0, while hex values are defined by a leading 0x.

Syntax

Parameter Values

Technical Details

More Examples

Example

Using the octal value 046 to add the ASCII Character: &.

Example

Using the decimal values 43 and 61 to add the ASCII Characters: + and =.

COLOR PICKER

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Источник