PHP数字操作

Question

$ch是一个角色。

我需要把它转换成像这样的2个数字(示例)：

$ch = 'A'       =>      ASCII code: 0x41
                =>      Binary: 0100 0001
                =>      {4, 1}

实现这一目标的最简单、最快的方法是什么？

Answer 1

可以使用ord()函数获取ASCII值，然后使用decbin和dechex将其转换为二进制和十六进制格式

http://www.php.net/manual/en/function.ord.php http://www.php.net/manual/en/function.decbin.php http://www.php.net/manual/en/function.dechex.php

Answer 2

$i = ord($chr);
$hex = dechex($i);
$ret = array($hex[0], $hex[1]);

Answer 3

<?

$ch = 'A';

$hex = base_convert(ord($ch), 10, 16);
$binary = base_convert(ord($ch), 10, 2);
$hex_nibbles = str_split($hex);

$hex_formatted = "0x$hex";

$binary_formatted = str_pad($binary, ceil(strlen($binary)/8)*8, '0', STR_PAD_LEFT);
$binary_formatted = preg_replace('/.{4}/', "$0 ", $binary_formatted);

$hex_nibbles_formatted = '{' . join($hex_nibbles, ', ') . '}';

echo <<<EOF
ASCII code: $hex_formatted
Binary: $binary_formatted
Hex Nibbles: $hex_nibbles_formatted

EOF;

?>