sorting array value without using built in php like sort() etc

Answer 1

$arr = array(8, 2, 7, 4, 5);

for($j=0; $j <= count($arr)-1; $j++){
  for($i=0; $i <= count($arr)-1; $i++){

      if( $arr[$i] < $arr[$j]){  //'<' or '>' operator for Asc, Dec.
         $temp = $arr[$i];
         $arr[$i] = $arr[$j];
         $arr[$j] = $temp;
      }
}
echo'
';
print_r($arr);