How to construct an expression with many variables with the same name pattern?

Question

I have 50 variables in my system script. All of them have the same naming scheme, for example:

$case_un
$case_deux
$case_trois
...
$case_fourthy

I need to build an expression with all these variables without having to write code with 50 variable names!

Since all my variable names start with the "case_" pattern, is there a syntax to sum them or another expression?

I need to perform something like this:

$test_of_cases = $case_un && $case_deux && $case_trois && ...........$case_fourthy ;

And that thing:

$total_of_sums = $sum_un + $sum_deux + ............$sum_fifthy ;

So, is there a way to code in PHP? In formal language I just need to sum all variables whose names start with 'case_'.

My 50 variables cannot be stored in an array because they come from different sources and expression results.

I'm not sure, but I think there is an expression to do this in other languages:

LET a=SUM (`*case_*`)
    LET b=XOR (`*case_*`)
    LET c=AND (`*case_*`)

I learned this in my studies 30 years ago...

I hope PHP can do this, otherwise it won't work and I'll have to write 50 lines of code!

Sincere regards

Answer 1

Suppose you have an array like this

$arr = [
    'people_physic_eyes' => 1,
    'people_physic_weight' => 2,
    ...
    'name' => 'james',
    'age' => 15,
    ...
];

You want to sum all values ​​whose key name starts with "people_physical_", there are many ways to achieve this, here is one using array_reduce:

$sum = array_reduce(
    array_keys($arr),
    function ($sum, $key) use ($arr) {
        # if the key starts with 'people_physic_', sum up the value
        return strpos($key, 'people_physic_') === 0 ? $sum + $arr[$key] : $sum;
    },
    0
);

But this is not efficient because you have to compare all keys on every call.