CODEWITHSUNDEEP
php
user4815703
user4815703

Reputation:

How to calculate position of array item?

I have an array with a whole bunch of badges. I have 3 variables that come from the database. I need some idea of how I can calculate the position of my $current variable to the $start and $end variables and then output as an int for a %.

Example:

$data = array(
     ['a','b','c'],
     ['d','e']
);

$start = 'b';
$current = 'c';
$end = 'e';

*Some maths equation to return position value?*

The only idea I have is I probably can count somehow how many variables are between $start and $end and somehow subtract the position of $current?

Update

I tried your code but I think I messed up somewhere:

// Progress Bar configurations
$data = array(
        array('diamond_V','diamond_IV','diamond_III','diamond_II','diamond_I'),
        array('platinum_V','platinum_IV','platinum_III','platinum_II','platinum_I'),
        array('gold_V','gold_IV','gold_III','gold_II','gold_I'),
  array('silver_V','silver_IV','silver_III','silver_II','silver_I'),
  array('bronze_V','bronze_IV','bronze_III','bronze_II','bronze_I')
);

$start = $start_rank;
$current = $current_rank;
$end = $finish_rank;

foreach($data as $key => &$value){
$value = implode(",", $value);
}
$dataimplode = implode(",", $data);

$key = array_search($current, $dataimplode);
var_dump($key);

Upvotes: 0

Views: 680

Answers (4)

Philipp
Philipp

Reputation: 15629

I don't know much about your data structure, but a generic solution would be something with nested loops:

$i = 0;
$startPos = -1;
$endPost = -1;
$currentPos = -1;

foreach ($data as $row) {
    foreach ($row as $item) {
        if ($item == $start) $startPos = $i;
        if ($item == $current) $currentPos = $i;
        if ($item == $end) $endPos = $i;
        
        $i++;
    }
}

Using this code would give you and unique index of each item in the array. The calculation of the distance is then just some subtraction.

Upvotes: 0

Arpita
Arpita

Reputation: 1398

Try following steps

  1. implode your existing array so that it looks like array('a,b,c,d,e')
  2. To do this fist implode the inner arrays in your $data so that it becomes array(['a,b,c'],['d,e']) and then implode this array it would give you an array('a,b,c,d,e')
  3. once you get this then using $key = array_search($value, $array); you can get index of your values "b","c","e" = "2","3","5" respectively (say these numbers are saved in variables $start, $current and $end respectively)
  4. and since you have 3 numeric values now you can easily find the % of "3" by the formula (($current-$start)/($end-$start))*100

Implode $data using following code snippet

$data = array(
    array("a","b","c"),
    array("d","e","f")
);
foreach($data as $key => &$value){
    $value = implode(",", $value);
}
$dataimplode = explode(",",(implode(",", $data)));
print_r($dataimplode);

Upvotes: 0

Luis Ávila
Luis Ávila

Reputation: 699

The following function will return an array containing (i,j) meaning the value $needle can be found on $haystack[i][j]. This function supports only a cascade of 2 arrays max, e.g.: array(array()).

function recursive_array_search($needle,$haystack) {
    foreach($haystack as $key=>$value) {
        $some=array_search($needle,$value);
        if(is_array($value) && $some !== false){
            return array($key, $some);
        }
    }
    return false;
}

The following will give you the total index given the (i, j) and the $data array. This function supports only a cascade of 2 arrays max, e.g.: array(array()).

function gettotalindex($index, $array)
{
    $j = 0;
    for($i=0; $i<$index[0]; $i++)
    {
        $j += count($array[$i]);
    }
    $j += $index[1];
    return $j;
}

You can use both of these functions this way:

$start = gettotalindex(recursive_array_search('b', $data), $data);

I've joined them, though, so you'll be able to use recursive_total_index('b', $data) and get the total index and made it fully recursive, supporting an unlimited* number of cascades:

function recursive_total_index($needle, $haystack) {
    $index = 0;
    if(!is_array($haystack)) return false;
    foreach($haystack as $key=>$value) {
        $index += ($key>0 ? count($haystack[$key-1]) : 0);
        $some = recursive_total_index($needle,$value);
        if(is_array($value) && $some !== false){
            return $index+$some;
        }
        else if(!is_array($value) && $needle===$value)
        {
            return $key;
        }
    }
    return false;
}

Example of use:

$data = array( ['a','b'], ['c','d'], array(['e','f'],['g','h'], array(['i','j'])));
echo recursive_total_index('i', $data);    

*Outputs 8*

Then just subtract and do what you want.

Upvotes: 0

Nirnae
Nirnae

Reputation: 1345

You could do the following :

First get the position of every items :

  • $start should be 0
  • $current with array_search()
  • $end with count()

then once your 3 vars are numbers it's time to do some maths.

($current - $start) / ($end - $start )

Will give you the percentage, even if you're using negative numbers (as long as $end > $current > $start).

Upvotes: 0

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