Same number different formats in PHP

I have two numbers in PHP. 81.0000 and 81. While they are equal in reality I cannot get them to be equal in PHP.

I have tried casting both numbers to float and they still won't come thought开发者_StackOverflow中文版 as equal.

Anyone have any idea how I can have these two numbers be the same?

Check out the awesome WARNING on php.net:

never trust floating number results to the last digit, and never compare floating point numbers for equality.

The very best you can to is type cast to (int), or use PHP rounding functions like round(), floor(), or ceil().

UPDATE
Check out the Arbitrary Precision Math Functions such as the one @Jose Vega pointed out in his answer. They should get you where you need to go.

bccomp — Compare two arbitrary precision numbers

bccomp ( string $left_operand , string $right_operand [, int $scale ] )

<?php

echo bccomp('1', '2') . "\n";   // -1
echo bccomp('1.00001', '1', 3); // 0
echo bccomp('1.00001', '1', 5); // 1

?>