bcadd

Add two arbitrary precision numbers (PHP 4, PHP 5)
string bcadd ( string left_operand, string right_operand [, int scale] )

Sums left_operand and right_operand.

left_operand: The left operand, as a string.
right_operand: The right operand, as a string.
scale: This optional parameter is used to set the number of digits after the decimal place in the result. You can also set the global default scale for all functions by using bcscale().

The sum of the two operands, as a string.

<?php


$a = '1.234';
$b = '5';


echo bcadd($a, $b);     // 6
echo bcadd($a, $b, 4);  // 6.2340

?>