Add numbers of several Strings in PHP

Hello,

You can do the sum as follows.

<?php
$a = '66';
$b = '5';
$soma = $a + $b;
echo $soma;
//exibe 71
?>

Now, if you plan to add decimal numbers, the story is different.

I recommend in this case to use PHP math functions: bcadd

<?php
echo PHP_EOL;
$a = '0.66';
$b = '0.05';
$soma = bcadd($a, $b, 2);
echo $soma;
//exibe 0.71
?>

Here's an article in English explaining the problem: php-floating-point-numbers- when-equating