Generated variable results in wrong result

I have the following code:

$fut1 = 9814;
$Awaarde = 8304;
$Bwaarde = 5111;

$arrayAantallen = array("A", "B");

foreach ($arrayAantallen as $letter)
{
        $lijstMijnWaardes .= 'number_format(((round(' . ${$letter."waarde"} . ', -2))/1000), 1) + ';
}

$waarde = $lijstMijnWaardes + number_format(((round($fut1, -2))/1000), 1);

The result of $waarde is 9.8 (the value of $fut1), but I expect 23.2 (9.8+8.3+5.1).

Any idea? Thank you in advance!

edit: when I echo $lijstMijnWaardes, that result seems te be correct:

number_format(((round(8304, -2))/1000), 1) + number_format(((round(5111, -2))/1000), 1) +

Answer

Based on the above requirement, Try this,

$fut1 = 9814;
$Awaarde = 8304;
$Bwaarde = 5111;

$arrayAantallen = array("A", "B");

foreach ($arrayAantallen as $letter)
{
        $lijstMijnWaardes += number_format(((round(${$letter."waarde"}, -2))/1000), 1);
}

$waarde = $lijstMijnWaardes + number_format(((round($fut1, -2))/1000), 1);

Problem with your Code:

in the line $lijstMijnWaardes .= 'number_format(((round(' . ${$letter."waarde"} . ', -2))/1000), 1) + '; you are concatenating strings not forming an equation.

Advice:

Instead of forming the complete equation try performing that equation in every step.