how to get top 3 values in php array and their index - php

Question

I want to get the highest value, the second highest value and the third highest value
For example, I have an array like:
$n = array(100,90,150,200,199,155,15,186);
I know the method to get the max value and its index:
echo max($n); //200
$maxs = array_keys($n, max($n));
echo $maxs[0]; //3
I want to get the top 3 values and their index like : value: 200, 199, 186 index:3,4,7
How can i get them?

Answer 1

Try this:
$n = array(100,90,150,200,199,155,15,186);
rsort($n);
$top3 = array_slice($n, 0, 3);
echo 'Values: ';
foreach ($top3 as $key => $val) {
echo "$val\n";
}
echo '<br>';
echo 'Keys: ';
foreach ($top3 as $key => $val) {
echo "$key\n";
}
Output:
Values: 200 199 186
Keys: 0 1 2

Answer 2

This should do the trick:
function maxNitems($array, $n = 3){
asort($array);
return array_slice(array_reverse($array, true),0,$n, true);
}
Use like:
maxNitems(array(100,90,150,200,199,155,15,186));

Answer 3

You can achieve it by using arsort() and array_keys() functions:
arsort() sorts an array in reverse order and maintains index association
array_keys() returns all the keys or a subset of the keys of an array
Process array:
$n = array(100,90,150,200,199,155,15,186);
arsort($n);
$keys = array_keys($n);
Get top 3 values:
echo $n[$keys[0]];
echo $n[$keys[1]];
echo $n[$keys[2]];

Answer 4

$n = array(100,90,150,200,199,155,15,186);
arsort($n);
$x = 0;
while (++$x <= 3)
{
$key = key($n);
$value = current($n);
next($n);
echo "Key : " . $key . " Value : " . $value . '<br>' ;
}

Answer 5

Easier I would think:
arsort($n);
$three = array_chunk($n, 3, true)[0];
//or
$three = array_slice($n, 0, 3, true);

Answer 6

try this:
public function getTopSortedThree(array $data, $asc = true)
{
if ($asc) {
uasort($data, function ($a, $b) { return $a>$b;});
} else {
uasort($data, function ($a, $b) { return $a<$b;});
}
$count = 0;
$result = [];
foreach ($data as $key => $value) {
$result[] = $data[$key];
$count++;
if ($count >= 3){
break;
}
}
return $result;
}
send false for desc order and nothing for asc order
This functionality doesn't losing keys.