php数组如何过滤设定范围内的动态数值？

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.

Answer 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);

1. You need to natsort first to make this work.
2. 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.
3. Finally, array_values will return a re-indexed $result array.