My answer for this was like below

function solution($A) {
    // write your code in PHP7.0
   $res = 0;
   $h = 0;
   $i = 0;
   foreach ($A as $a) {
     if (isset($A[$i+1])) {

       if ($a == $A[$i+1]) {
       $res++;
           continue;
       }


       if ($h >= 2) {
       $res++;
       $h = 0;
   }
   if ($a < $A[$i+1]) {
           $h++;
       }


       if ($h <= -2) {
    $res++;
    $h = 0;
   }
   if ($a > $A[$i+1]) {
        $h--;
       }


     }
     $i++;
   }

   return $res;
}

My answer for this was like below

function solution($A) {        // write your code in PHP7.0
   $res = 0;
   $h = 0;
   $i = 0;
   foreach ($A as $a) {
     if (isset($A[$i+1])) {

       if ($a == $A[$i+1]) {
           $res++;
           continue;
       }

       if ($h >= 2) {
           $res++;
           $h = 0;
       }
       if ($a < $A[$i+1]) {
           $h++;
       }

       if ($h <= -2) {
        $res++;
        $h = 0;
       }
       if ($a > $A[$i+1]) {
        $h--;
       }
     }
     $i++;
   }
   return $res;
}