get lowest value in the array based on variable

Question

I am struggling to get the lowest value based on the answer of the client.

$client_answer = 28;

$array = array(10,20,30,40,50);

The answer that should be given is: 20

So every answer should be rounded down to the lower number.

Other examples:

$client_answer = 37;

$array = array(10,20,30,40,50);

answer should be 30.

$client_answer = 14;

$array = array(10,20,30,40,50);

answer should be 10.

$client_answer = 45;

$array = array(10,20,30,40,50);

answer should be 40.

Is there a php function that I can use for this?

If not how can this be accomplished?

Yes, but you have to write it :) Have you tried to write anything yet? — RiggsFolly
– RiggsFolly, Commented Jan 17, 2020 at 10:17
@RiggsFolly Yes I have but unfortunately It would pick the closest number... But I think Qirel fixed my question. Thanks for your time! — Vasco
– Vasco, Commented Jan 17, 2020 at 10:30
What if your answer falls out of the range of numbers in the array? — Progrock
– Progrock, Commented Jan 17, 2020 at 11:12
@Progrock with the answer of Qirel it wil take the closest. This is exactly what I needed. (: — Vasco
– Vasco, Commented Jan 17, 2020 at 11:18

Qirel · Accepted Answer · 2020-01-17 10:19:10Z

6

You can filter the array to only contain values equal to or below the given value $client_answer, then use max() on the filtered array.

$value = max(array_filter($array, function($v) use ($client_answer) {
    return $v <= $client_answer;
}));

Live demo at https://3v4l.org/KHB8r

answered Jan 17, 2020 at 10:19

Qirel

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Comments

Csmeau4 · Accepted Answer · 2020-01-17 10:21:33Z

-1

This might be a very stupid answer, but in this specific case, you are trying to truncate the unit number? Why not try this:

$client_answer = intdiv( $client_answer, 10) * 10;

Divide by 10, get rid of the last digit, and multiply again. EDIT : typo

edited Jan 17, 2020 at 10:21

answered Jan 17, 2020 at 10:20

Csmeau4

306 bronze badges

2 Comments

RiggsFolly Over a year ago

Except OP is trying to pick a number out of an array?

Vasco Over a year ago

the array could be any number so this would unfortunatly not work... thanks for your time though!

Vermeersch Wouter · Accepted Answer · 2020-01-17 10:50:20Z

-1

Only this rounds correctly

$client_answer = 28;
$array = array(10,20,30,40,50);
rsort($array,1);
$min_diff = max($array);
$closest_val = max($array);

foreach($array as $val)
{
    if(abs($client_answer - $val) < $min_diff)
    {
        $min_diff = abs($client_answer - $val);
        $closest_val = $val;
    }

}
echo $closest_val;

edited Jan 17, 2020 at 10:50

answered Jan 17, 2020 at 10:39

Vermeersch Wouter

636 bronze badges

3 Comments

Vasco Over a year ago

My question has already been solved. Thanks for taking the time though! This looks like a good alternative

Vermeersch Wouter Over a year ago

The suggested solution does not find the nearest value it always rounds down... but I am glad if that cover your needs.

Progrock Over a year ago

You are returning the nearest number in the array, not the lowest nearest. 3v4l.org/0Qfnm

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