从十进制向其它进制转换,用的是就用该数字不断除以要转换的进制数,读取余数。连接一起就可以了。
php" id="highlighter_177264">
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
<?php
/**
*十进制转二进制、八进制、十六进制 不足位数前面补零*
*
* @param array $datalist 传入数据array(100,123,130)
* @param int $bin 转换的进制可以是:2,8,16
* @return array 返回数据 array() 返回没有数据转换的格式
*/
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 ; //相同进制忽略
$bytelen = ceil (16/ $bin ); //获得如果是$bin进制,一个字节的长度
$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 ; //不足一个字节长度,自动前面补充0
}
$aOutChar []= $t ;
}
return $aOutChar ;
}
|
测试:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
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"
}
|
二进制、八进制、十六进制转十进制
这个转换用乘法,如:1101 转十进制:1*2^3+1*2^2+0*2^1+1*2^0
代码:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
<?php
/**
*二进制、八进制、十六进制 转十进制*
*
* @param array $datalist 传入数据array(df,ef)
* @param int $bin 转换的进制可以是:2,8,16
* @return array 返回数据 array() 返回没有数据转换的格式
* @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 ; //为10进制不转换
$aOutData = array (); //定义输出保存数组
foreach ( $datalist as $num )
{
$atnum = str_split ( $num ); //将字符串分割为单个字符数组
$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 ;
}
|
测试:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
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)
}
|
这些只是实现方式,其实不在乎php语言还是其它,实现思路都是一样的。php其实内置不少函数可以完成这些内容:
bindec(),decoct(),dechex() base_convert() decbin() 这里只是实现思路而已。呵呵!