php实现将任意进制数转换成10进制的方法
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这篇文章主要介绍了php实现将任意进制数转换成10进制的方法,涉及php数制转换的相关技巧,非常具有实用价值,需要的朋友可以参考下,本文实例讲述了php实现将任意进制数转换成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/>";
- }
Tags: php转换成10进制
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