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Finding out the duplicate value in an array without using array function in php

$myArray=array(4,5,2,1,4,3,9,8,7,6,5,3,11,15);
	$size= count($myArray);

 	for($i=0; $i<$size; $i++)
    		for($j = $i+1; $j < $size; $j++)
      			if($myArray[$i] == $myArray[$j])
        			echo $myArray[$i];

$myArray=array(4,5,2,1,4,3,9,8,7,6,5,3,11,15);

$size= count($myArray);

for($i=0; $i<$size; $i++)

for($j = $i+1; $j < $size; $j++)

if($myArray[$i] == $myArray[$j])

echo $myArray[$i];