bcmod
    (PHP 3, PHP 4, PHP 5)
bcmod -- 
     Get modulus of an arbitrary precision number
    
Description
string 
bcmod ( string left_operand, string modulus )
     Get the modulus of the left_operand using
     modulus.
    
Examples
Example 1. bcmod() example 
<?php echo bcmod('4', '2'); // 0 echo bcmod('2', '4'); // 2 ?>
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