รวม array ค่าที่เหมือนกันเอาเก็บไว้และแสดงแค่ 1 ตัวทำไงครับ

<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>

<?php
$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);
print_r($result);
?>

$array1 = array(1, 2, 3);
$array2 = array(1, 2, 3,4, 5);
$array3 = array(1,4, 3);
$myArray = array_merge($array1, $array2,$array3 );
	$myArrayuniq = array_unique($myArray);
	echo "ข้อมูลก่อนกำจัดข้อมูลซ้ำ <br>\n";
	foreach ($myArray as $index=>$word){
	    echo "$index - $word<br>\n";
	}
	echo "ข้อมูลหลังที่กำจัดข้อมูลซ้ำออกแล้ว<br>\n";
	foreach ($myArrayuniq as $index=>$word){
	    echo "$index - $word<br>\n";
	}