what is function can sum two big numbers php

I’m trying to Sum of two large numbers for some reason

<?php
$a = 50000000000.000000000000000000;
$b = 100000000000000000000000000000;
$sum = $a+$b;
echo $sum;

But the output appears like this:

1.0E+290

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Is there a function that can be used to sum two large numbers?

>Solution :

You can use bcmath extension that provide functions to perform mathematical operations with numbers of any size and precision up to 2147483647 decimal digits, if there is sufficient memory.

Example :

<?php
$a = '50000000000.000000000000000000';
$b = '100000000000000000000000000000';
echo bcadd($a,$b);
// result : 100000000000000000050000000000