php实现将任意进制数转换成10进制的方法

本文实例讲述了php实现将任意进制转换成10进制的方法。分享给大家供大家参考。具体如下:

php将任意进制的数转换成10进制,例如8进制转换成10进制,16进制转换成10进制

  <?php  # Show the steps involved in converting a number   # from any base (like octal or hex) to base 10  # See below for examples, instructions and copyright  function show_convert_to_base_10 ($number, $base)  {   // If the number contains a decimal component   if (strstr ($number, '.'))   {    // Get the integer and decimal components    list ($integer, $decimal) = explode ('.', $number);   }   else   {    // The number is an integer    $integer = $number;   }    print "<b>Convert the base $base number $number to a    base 10 number:</b><blockquote>";    print "Convert the integer component ($integer) of the     number:<blockquote>";   // Compute the value of the integer component   // Loop through the integer digit by digit   // Reverse the number for easier handling   $integer = strrev ($integer);   $length = strlen ($integer);   for ($pos = 0; $pos < $length; ++$pos)   {    /*     PHP lets you treat strings and numbers like arrays     Specify an offset and get the character at that     position    */     $digit = $integer[$pos];    // Handle character values for digits    // (for bases greater than 10)    if (eregi ('[a-z]', $digit))    {     $digit_value =       (ord (strtolower ($digit))       - ord ('a')) + 10;      $digit = "$digit ($digit_value)";    }    else    {     $digit_value = $digit;    }    // Multiply the current digit by the radix    // raised to the power of the current position    $result = $digit_value * pow ($base, $pos);     print "Multiply the value of the digit at position      $pos by the value of the radix ($base) raised      to the power of the position ($pos):<br/>";     print "$digit * $base<sup>$pos</sup> = $result      <br/><br/>";     $sums[] = $result;   }   print '</blockquote>';   if (isset ($decimal))   {     print "Convert the decimal component (0.$decimal)     of the number:<blockquote>";    // Pad the number with a leading 0 so that we can    // start at position 1    $decimal = '0'.$decimal;    $length = strlen ($decimal);     for ($pos = 1; $pos < $length; ++$pos) {     $digit = $decimal[$pos];     // Handle character values for digits     // (for bases greater than 10)     if (eregi ('[a-z]', $digit))     {       $digit_value =       (ord (strtolower ($digit))       - ord ('a')) + 10;        $digit = "$digit ($digit_value)";     }     else     {       $digit_value = $digit;     }     // Multiply the current digit by the radix     // raised to the power of the current position     $result = $digit_value * pow (1/$base, $pos);      print "Multiply the value of the digit at      position $pos by the value of the 1/radix      ($base) raised to the power of the position      ($pos):<br/>";      print "$digit * 1/$base<sup>$pos</sup> =      $result<br/><br/>";      $sums[] = $result;    }    print '</blockquote>';   }   $sums = implode (' + ', $sums);   eval ("$base_10_value = $sums;");    print "</blockquote>The value of the base $base number    $number in base 10 is $base_10_value. <br/>";    print "This number is derived from the sum of the values    of the previous operations ($sums). <br/> <br/>";  }

希望本文所述对大家的php程序设计有所帮助。

php实现将任意进制数转换成10进制的方法

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