(PHP 4, PHP 5, PHP 7)
bccomp — Compare two arbitrary precision numbers
$left_operand
   , string $right_operand
   [, int $scale = 0
  ] )
   Compares the left_operand to the
   right_operand and returns the result as an
   integer.  
  
left_operandThe left operand, as a string.
right_operandThe right operand, as a string.
scale
       The optional scale parameter is used to set the
       number of digits after the decimal place which will be used in the
       comparison.  
      
   Returns 0 if the two operands are equal, 1 if the
   left_operand is larger than the 
   right_operand, -1 otherwise.
  
Example #1 bccomp() example
<?php
echo bccomp('1', '2') . "\n";   // -1
echo bccomp('1.00001', '1', 3); // 0
echo bccomp('1.00001', '1', 5); // 1
?>