PHP implementation of the conversion to each other, PHP binary conversion _php Tutorial

PHP implements binary conversion, PHP conversion

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.

<?php/** * Decimal to binary, octal, hexadecimal less than 0 * * * @param array $datalist incoming data array (100,123,130) * @param int $bin The conversion of the binary can be: 2, 8, * @return Array return data array () returns no data conversion format */function decto_bin ($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; The same binary ignores  the $bytelen =ceil (16/$bin);//Gets the length of a byte  $aOutChar =array ()  If it is $bin-binary; foreach ($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, automatically preceded by 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/5.2.0content-type:text/htmlarray (2) {[0]=> string (8) "10000000" [1]=> string (8) "11111101"} Array (2) {[0]=> string (4) "0200" [1]=> string (4) "0375"}array (2) {[0]=> string (2) "" [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:

<?php/** * Binary, octal, hexadecimal goto decimal * * * @param array $datalist incoming data array (DF,EF) * @param int $bin conversion can be: 2,8,16 * @return A Rray return Data Array () returns no data conversion format * @copyright Chengmo qq:8292669 */function bin_todec ($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; For 10 binary does not convert  $aOutData =array ();//define Output Save array  foreach ($datalist as $num)  {    $atnum =str_split ($num); Splits 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;  }  

Test:

Var_dump (Bin_todec (Array (' FF ', ' ff33 ', ' cc33 ')), Var_dump (Bin_todec (' 1101101 ', ' 111101101 '), 2); var_dump (Bin_todec (Array (' 1234123 ', ' 12341 '), 8)); X-powered-by:php/5.2.0content-type:text/htmlarray (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)}

These are just ways to implement, 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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http://www.bkjia.com/PHPjc/1119997.html www.bkjia.com true http://www.bkjia.com/PHPjc/1119997.html techarticle PHP implements the conversion from one to the other, and the PHP binary converts from decimal to the other, using the number to be divided by the number of binary numbers to be converted, and the remainder to be read. Connect together to ...

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