Search for 3 numbers that summable to zero using PHP

app.php

<?php

function threeSummableToZero($arr) {
    
    for($i = 0; $i < count($arr); $i++) {
        for($j = 0; $j < count($arr); $j++) {
            for($k = 0; $k < count($arr); $k++) {
                if($i == $j || $j == $k || $i == $k) continue;
                
                if($arr[$i] + $arr[$j] + $arr[$k] == 0) return "[".$arr[$i].", ".$arr[$j].", ".$arr[$k]."]";
            }
        }    
    }
    
    return "Not Found";
}

echo threeSummableToZero([2, 6, 8, -5, 2, 9, 3]);