finding an array range in PHP

Question

I have a range of values in an array like:

$values = array(0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,1.1,1.2,1.3,1.4,1.5);

I need to find the index of the smallest value in that array that's greater than or equal to a specified number. For example, if the user inputs 0.25, I need to know that the first array index is 2.

In other languages I've used, like R, there is a 'which' function that will return an array of indices that meet some criteria. I've not found that in PHP, so i'm hopeful someone else has solved this.

Thanks.

Sergiu Paraschiv · Accepted Answer · 2013-08-23 18:25:19Z

1

You can use array_filter

It does exactly what R which does.

answered Aug 23, 2013 at 18:25

Sergiu Paraschiv

10.2k5 gold badges42 silver badges51 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Barmar Over a year ago

Actually, you'd then need to call array_keys on the result to get the indices.

rAjA · Accepted Answer · 2013-08-23 18:25:50Z

0

Hope this function will help you,

function find_closest_item($array, $number) {
    sort($array);
    foreach ($array as $a) {
        if ($a >= $number) return $a;
    }
    return end($array); // or return NULL;
}

answered Aug 23, 2013 at 18:25

rAjA

9199 silver badges13 bronze badges

Comments

sUP · Accepted Answer · 2013-08-23 18:25:57Z

0

I don't know if there's a built in function for that, but this should work:

function getClosest($input, $array) 
{
    foreach($array as $value)
    {
        if ($value >= $input)
        {
            return $value;
        }
    }

    return false;
}

answered Aug 23, 2013 at 18:25

sUP

6244 silver badges16 bronze badges

Comments

rakeshjain · Accepted Answer · 2013-08-23 18:32:43Z

0

You can use the following working logic. There might be other built in functions which can be used to solve this problem.

<?php
$values = array(0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,1.1,1.2,1.3,1.4,1.5);
$search=0.35;
$result_index = NULL;
$result_value=NULL;

$count=count($values);
for($i=0;$i<$count;$i++) {
    if($values[$i]<$search) {
        continue;
    }
    if($result_index==NULL) {
        $result_index = $i;
        $result_value = $values[$i];
        continue;
    }

    if($values[$i]<$result_value) {
        $result_index = $i;
        $result_value = $values[$i];
    }

}
print $result_index . " " . $result_value;
?>

answered Aug 23, 2013 at 18:32

rakeshjain

1,76111 silver badges11 bronze badges

Comments

Andrew · Accepted Answer · 2013-08-23 18:48:09Z

0

You can build your own custom function:

function findIndex($input_array, $num)
{
    foreach($input_array as $k => $v)
    {
        if($v >= $num)
        {
           return $k;
        }       
    }

    return false;
}

This function will return array index (key). If you don't want index, but the value, then other functions posted here will do the job. You should clarify what exactly you want to get as your question is a little bit amiguous

edited Aug 23, 2013 at 18:48

answered Aug 23, 2013 at 18:36

Andrew

5058 silver badges22 bronze badges

Collectives™ on Stack Overflow

finding an array range in PHP

5 Answers 5

1 Comment

Comments

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

1 Comment

Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related