Decimal conversion to binary, octal, hexadecimal
From decimal to other binary conversions, the remainder is read by dividing the number by the number of binary numbers to be converted. Connected together on it.
Copy CodeThe code is as follows:
/**
* decimal-to-binary, octal, hex-less digits 0 *
*
* @param array $datalist incoming data array (100,123,130)
* The binary @param int $bin conversion can be: 2,8,16
* @return Array return data array () returns no data conversion format
* @copyright Chengmo qq:8292669
*/
function Decto_bin ($datalist, $bin)
{
Static $arr =array (0,1,2,3,4,5,6,7,8,9, ' A ', ' B ', ' C ', ' D ', ' E ', ' F ');
if (!is_array ($datalist)) $datalist =array ($datalist);
if ($bin ==10) return $datalist; Same binary Ignore
$bytelen =ceil (16/$bin); Get the length of a byte if it is a $bin binary
$aOutChar =array ();
foreach ($datalist as $num)
{
$t = "";
$num =intval ($num);
if ($num ===0) continue;
while ($num >0)
{
$t = $arr [$num% $bin]. $t;
$num =floor ($num/$bin);
}
$tlen =strlen ($t);
if ($tlen% $bytelen!=0)
{
$pad _len= $bytelen-$tlen% $bytelen;
$t =str_pad ("", $pad _len, "0", str_pad_left). $t; Less than one byte length, auto front add 0
}
$aOutChar []= $t;
}
return $aOutChar;
}
Test:
Var_dump (Decto_bin (Array (128,253), 2));
Var_dump (Decto_bin (Array (128,253), 8));
Var_dump (Decto_bin (Array (128,253), 16));
x-powered-by:php/5.2.0
Content-type:text/html
Array (2) {
[0]=>
String (8) "10000000"
[1]=>
String (8) "11111101"
}
Array (2) {
[0]=>
String (4) "0200"
[1]=>
String (4) "0375"
}
Array (2) {
[0]=>
String (2) "80"
[1]=>
String (2) "FD"
}
Binary, octal, hexadecimal to decimal
This conversion is multiplied, for example: 1101 to decimal: 1*2^3+1*2^2+0*2^1+1*2^0
Code:
Copy CodeThe code is as follows:
/**
* Binary, octal, hexadecimal to decimal *
*
* @param array $datalist incoming data array (DF,EF)
* The binary @param int $bin conversion can be: 2,8,16
* @return Array return data array () returns no data conversion format
* @copyright Chengmo qq:8292669
*/
function Bin_todec ($datalist, $bin)
{
Static $arr =array (' 0 ' =>0, ' 1 ' =>1, ' 2 ' =>2, ' 3 ' =>3, ' 4 ' =>4, ' 5 ' =>5, ' 6 ' =>6, ' 7 ' =>7, ' 8 ' =>8, ' 9 ' =>9, ' A ' =>10, ' B ' =>11, ' C ' =>12, ' D ' =>13, ' E ' =>14, ' F ' =>15 ';
if (!is_array ($datalist)) $datalist =array ($datalist);
if ($bin ==10) return $datalist; No conversion for 10 binary
$aOutData =array (); Define output Save Array
foreach ($datalist as $num)
{
$atnum =str_split ($num); Splitting a string into a single character array
$atlen =count ($atnum);
$total = 0;
$i = 1;
foreach ($atnum as $TV)
{
$tv =strtoupper ($TV);
if (Array_key_exists ($TV, $arr))
{
if ($arr [$tv]==0) continue;
$total = $total + $arr [$tv]*pow ($bin, $atlen-$i);
}
$i + +;
}
$aOutData []= $total;
}
return $aOutData;
}
Test:
Var_dump (Bin_todec (Array (' FF ', ' ff33 ', ' cc33 '), 16));
Var_dump (Bin_todec (Array (' 1101101 ', ' 111101101 '), 2));
Var_dump (Bin_todec (Array (' 1234123 ', ' 12341 '), 8));
x-powered-by:php/5.2.0
Content-type:text/html
Array (3) {
[0]=>
Int (255)
[1]=>
Int (65331)
[2]=>
Int (52275)
}
Array (2) {
[0]=>
Int (124)
[1]=>
Int (508)
}
Array (2) {
[0]=>
Int (342099)
[1]=>
Int (5345)
}
Something, these are only the implementation of the way, in fact, do not care PHP language or other, the realization of ideas are the same. PHP actually has a few built-in functions to do this:
Bindec (), Decoct (), Dechex () Base_convert () Decbin () Here is just the idea. Oh!
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