Finding Largest number in an array without using any pre-defined function

$array1= array(1,4,2,7,8);
$max = $array1[0];

for($i=1; $i<=count($array1); $i++)
     {
      if($array1[$i]> $max)
          {
          $max = $array1[$i];
          }
      }
        echo $max;

Output: 8

USING FOREACH LOOP

$array1= array(1,2,3,1);
$max = $array1[0];

foreach($array1 as $key => $val){
if($max > $val)
{
$max=$val;
}
}
     

        echo $max;