A simple code to count valley, hackerrank.com sample exercise using php

countValleyAndMountain.php

<?php

function countingValleys($steps, $path) {
    // Write your code here
    if(strlen($path)!==($steps)){
        return false;
    }
    $sea_level = 0;
    $valley = 0;
    $mountain = 0;
    foreach(str_split($path) as $p){
        if('U' === strtoupper($p)){
            $sea_level++;
            if($sea_level===0){
                $valley++;
            }
        }
        if('D' === strtoupper($p)){
            $sea_level--;
            if($sea_level===0){
                $mountain++;
            }
        }
    }
    
    // return number of valley, change to mountain if you want to count mountains
    return $valley;
}

?>