<?php

$searchedForValue = 3;

$array1 = array(1,2,3,4,5,6);
$array2 = array(1,2,3,3,4,5);
$array3 = array(1,2,4,5,6);
$arr = array($array1,$array2 ,$array3);
function array_count_values_of($value, $array) {
    $counts = array_count_values($array);
    return $counts[$value];
}
foreach($arr as $ar){
if( array_count_values_of($searchedForValue,$ar)==1){echo "true";}else{echo "false";}
}

?>

truefalsefalse