php array how to filter dynamic number values in a set range?

Question

I have a function that returns an array with the values as numbers. The array values are dynamic and will change all the time.

The numbers have a set range, with the higher value determined by the last digit (i.e _1,2,3)

Im not sure if range() is the answer but I'll include them here.

e.g. of ranges:

100_1 100_2 100_3 101_1 101_2 101_3 102_1 102_2 102_3 103_1 103_2 103_3 104_1 104_2 104_3

For this example the returned array is as follows:

Array
(

[0] => 100_1
[1] => 100_2
[2] => 100_3
[3] => 101_1
[4] => 102_1
[5] => 102_2
[6] => 103_1
[7] => 103_2
[8] => 103_3
[9] => 104_1
[10] => 104_2

)

What I would like is to foreach(), (or similar) the array and return it like this:

Array
(

[1] => 100_3
[2] => 101_1
[3] => 102_2
[4] => 103_3
[5] => 104_2

)

If you notice only the higher values have been returned according to the set range.

As I am a newbie to php is there a simple solution I can understand? I appreciate any help thanks.

Please clarify this question. Do you want to extract a portion of the input array between two specific points? — mickmackusa
– mickmackusa ♦, Commented Sep 9, 2017 at 22:00

AbraCadaver · Accepted Answer · 2014-08-04 20:02:09Z

1

I was bored. This should do it:

natsort($array);

foreach($array as $value) {
    $parts = explode('_', $value);
    $result[$parts[0]] = $value;
}
$result = array_values($result);

You need to natsort first to make this work.
Then explode to get the base number for the key (i.e. 100) and the extra number for the value (i.e 1). The next 100 etc. will overwrite the previous and store the extra number (i.e. 2), etc.
Finally, array_values will return a re-indexed $result array.

edited Aug 4, 2014 at 20:02

answered Aug 4, 2014 at 19:46

AbraCadaver

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Comments

Patrick Q · Accepted Answer · 2014-08-04 19:50:04Z

I'm not 100% sure if this is the most efficient way to do it, but it works.

$myArray = array("100_1", "100_2", "100_3", "101_1", "102_1", "102_2", "103_1", "103_2", "103_3", "104_1", "104_2");
$resultArray = array();

foreach($myArray as $entry)
{
    $parts = explode("_", $entry);
    $found = FALSE;

    // I really don't like that I'm iterating this every time
    // this is why I think there might be a more efficient way.
    foreach($resultArray as $key => $resultEntry)
    {
        $resultParts = explode("_", $resultEntry);

        // if the part before the underscore matches an entry in the array
        if($parts[0] == $resultParts[0])
        {
            $found = TRUE;

            // see if the part after the underscore is greater than
            // the part after for the entry already in the result
            if((int)$parts[1] > (int)$resultParts[1])
            {
                $resultArray[$key] = $entry;
            }
        }
    }

    if(!$found)
    {
        $resultArray[] = $entry;
    }
}

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