Decimal to binary conversion, using BC Math.
Note: this function is VERY slow if the decimal number is too big!
<?
function bc_decbin($dec_str) {
if (strlen($dec_str)>0) {
$bin_str = '';
do {
if (((int)$dec_str[strlen($dec_str)-1] % 2) === 0)
$bin_str .= '0';
else
$bin_str .= '1';
$dec_str = bcdiv($dec_str, '2');
} while ($dec_str!='0');
return strrev($bin_str);
}
else
return null;
}
?>
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Cristian
www.CodeFlower.com
bcdiv
说明
string bcdiv ( string left_operand, string right_operand [, int scale] )
Divides the left_operand by the
right_operand.
参数
left_operandThe left operand, as a string.
right_operandThe right operand, as a string.
scaleThis optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale().
add a note
User Contributed Notes
cristianDOTzuddas]NOSPAM[gmailDOTcom
24-Jul-2005 12:10
24-Jul-2005 12:10