<?php
function binarycodedstring2dec($binary) {
$len=strlen($binary);
$rows=($len/4)-1;
if (($len%4)>0) {
$pad=$len+(4-($len%4));
$binary=str_pad($binary,$pad,"0",STR_PAD_LEFT);
$len=strlen($binary);
$rows=($len/4)-1;
}
$x=0;
for ($x=0;$x<=$rows;$x++) {
$s=($x*4);
$bins=$binary[$s].$binary[$s+1].$binary[$s+2].$binary[$s+3];
$num=base_convert($bins,2,10);
if ($num>9) {
die("the string is not a proper binary coded decimal\n");
} else {
$res.=$num;
}
}
return $res;
}
?>
a binary coded decimal is converted by taking groups of four from a decimal string,
for example the binary coded decimal string
1000 = 8
10001000 does not = 136 but 88
so
binarycodedstring2dec(1000) = 8
binarycodedstring2dec(11100000111001)=3839
binarycodedstring2dec(100000111001)=839
i truly have no idea if this function will be useful to anyone, i simply failed a physics midterm because i didn't know this so i wrote this function to make sure i would never forget how to convert binary coded decimals
