ord

(PHP 4, PHP 5)

ordВозвращает ASCII-код символа

Описание

int ord ( string $string )

Возвращает ASCII-код первого символа строки string.

Эта функция дополняет функцию chr().

Список параметров

string

Символ.

Возвращаемые значения

Возвращает ASCII-код в виде целого числа.

Примеры

Пример #1 Пример использования ord()

<?php
$str 
"\n";
if (
ord($str) == 10) {
    echo 
"Первый символ \$str - перевод строки.\n";
}
?>

Смотрите также

Коментарии

I did not found a unicode/multibyte capable 'ord' function, so...

<?php
function uniord($u) {
   
$k mb_convert_encoding($u'UCS-2LE''UTF-8');
   
$k1 ord(substr($k01));
   
$k2 ord(substr($k11));
    return 
$k2 256 $k1;
}
?>
2004-05-28 19:15:59
http://php5.kiev.ua/manual/ru/function.ord.html
As ord() doesn't work with utf-8, and if you do not have access to mb_* functions, the following function will work well:
<?php
function ordutf8($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 32 0) - ($bytesnumber 16 0);
        for (
$i 2$i <= $bytesnumber$i++) {
           
$offset ++;
           
$code2 ord(substr($string$offset1)) - 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:
<?php
$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.
2012-08-23 18:06:08
http://php5.kiev.ua/manual/ru/function.ord.html
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.
2013-06-11 21:28:54
http://php5.kiev.ua/manual/ru/function.ord.html

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