http://i...content-available-to-author-only...e.com/7MM3Y6<?php
$arr = array (20, 1, 5, 10, 7, 16,-45,90,8,-77,88,77);
$temp=array();
for ($i = 0; $i < count($arr); $i++)
 {
     $diff=0;
     for ($j = $i+1; ($j < count($arr) && $i!=$j); $j++)
     {
         $diff=abs($arr[$i]-$arr[$j]);
         $temp[] = array($arr[$i], $arr[$j], $diff);
     }
 }
 usort($temp,
     function ($a, $b) { return $b[2] < $a[2]; });
  list($x,$y,$d) = $temp[0];
echo "Related Values are $x and $y by $d";
?>
 

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