test1.php

<?php
  $arr = array(1,2,3,4,5,6,7,8,9,10);
	$arrLess = array();
	$arrGret = array();
	
	$total = 0;
	$nuEle = count($arr);
	foreach($arr as $arr_ele){
		$total+=$arr_ele;
	}
	$avg = $total/$nuEle;
	
	foreach($arr as $arr_ele){
		if($arr_ele > $avg){
			array_push($arrGret,$arr_ele);
		}elseif($arr_ele < $avg){
			array_push($arrLess,$arr_ele);
		}
	}
?>