How to find highest ,second highest number, Lowest Second Lowest number from Array in PHP

Question

Highest, second highest number and lowest or smallest and second lowest number from an array in php.

$array = array('2','1','200','15','300','500','69','422','399','201','299');

Answer 1

There are several ways in php to solve this problem.

Use PHP Built in method system

 $array = array('2','1','200','15','300','500','69','422','399','201','299');
//First order the array 
sort($array);
 $lowest = $array[0];
 $secondLowest = $array[1];
 $highest = $array[count($array)-1];
 $SecondHighest = $array[count($array)-2];

echo "Lowest number is $lowest, Second lowest number is $secondLowest and Highest number is $highest, Seoncd highest is $SecondHighest";

Find Highest and Second highest number with for loop

$array = array('2','1','200','15','300','500','69','422','399','201','299');
$secondHighest=$highest=0;
for ($i=0; $i < count($array); $i++) { 

    if ($array[$i] > $highest ) {
        $secondHighest=$highest;
        $highest=$array[$i];
    }elseif ( $array[$i] > $secondHighest ) {
        $secondHighest= $array[$i];
    }
}

echo "Highest number is $highest and Second highest number is $secondHighest.";

Find Lowest and Second Lowest number with for loop

    $array = array('2','1','200','15','300','500','69','422','399','201','299');

$lowest=$array[0];
$gotLowest=0;
$smallArray=[];
$secondLowest=0;
$lowestnext=0;

for ($i=0; $i < count($array); $i++) { 
    // find lowest value and run only first time
    if($gotLowest == 0 ){
        for ($k=0; $k < count($array) ; $k++) { 
            if ( intval($array[$k]) < $lowest ) {
                $lowest= $array[$k]; //lowest value
            }           
        }
        $gotLowest=1; // change value so that run this condition only one time
    }

    if ( $lowestnext ==0 && intval($array[$i]) > $lowest) {
         $lowestnext=$array[$i];
    }
    // find second smaller value from array
    if ( $array[$i] > $lowest && $array[$i] <= $lowestnext ) {
        $smallArray[] = $array[$i];
        for ($j=0; $j < count($smallArray); $j++) { 
            if ( $smallArray[$j] < $secondLowest ) {
                $secondLowest=$smallArray[$j];
            }
        }
        $secondLowest=$smallArray[0];
    }
}


echo "Lowest number is $lowest and Second Lowest number is $secondLowest.";