php實現將任意進位數轉換成10進位的方法，php進位_PHP教程

php實現將任意進位數轉換成10進位的方法，php進位

本文執行個體講述了php實現將任意進位數轉換成10進位的方法。分享給大家供大家參考。具體如下：

php將任意進位的數轉換成10進位，例如8進位轉換成10進位，16進位轉換成10進位

<?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 copyrightfunction 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 "Convert the base $base number $number to a  base 10 number:
 

  ";  print "Convert the integer component ($integer) of the   number:
  

   "; // 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):
   
"; print "$digit * $base$pos = $result 
   

   
"; $sums[] = $result; } print '
  
'; if (isset ($decimal)) {   print "Convert the decimal component (0.$decimal)   of the number:
  

   "; // 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):
   
"; print "$digit * 1/$base$pos = $result
   

   
"; $sums[] = $result; } print '
  
'; } $sums = implode (' + ', $sums); eval ("\$base_10_value = $sums;");  print "
 
The value of the base $base number  $number in base 10 is $base_10_value. 
";  print "This number is derived from the sum of the values  of the previous operations ($sums). 
 
";}

希望本文所述對大家的php程式設計有所協助。

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