perfect num

index.php

<?php

// $get=$_GET;
$post=$_POST;

$num=isset($post['num'])?$post['num']:0;

?>
<form method="post" action="">
    <div>
        <label for="">Num</label>
        <!-- <input type="text" name="num" value=""> -->
        <textarea name="num" id="" cols="30" rows="10"><?=$num?></textarea>
    </div>
    <input type="submit">
</form>
<?php 

function preout($v=[]){
    echo "<pre>";
    var_dump($v);
    echo "</pre>";
}

function isPerfect($n){
	$sum = 1; 

	for ($i = 2; $i * $i <= $n; $i++) { 
		if ($n % $i == 0) { 
			if($i * $i != $n)
				$sum = $sum + $i + (int)($n / $i);
			else
				$sum = $sum + $i;
		}
    } 
    // echo "sum ".$sum;
    // echo "<br>";
	// If sum of divisors is equal to 
	// n, then n is a perfect number 
	if ($sum == $n && $n != 1){
		return "perfect";
		// return true; 
    }else if($n-$sum==1){
        return "hampir";
    }else{
        return "bukan";
    }

	return false; 
}

// Driver Code 
function test(){
    echo "Below are all perfect numbers till 10000\n"; 
    echo "<br>";
    for ($n = 2; $n < 100; $n++){
        if (isPerfect($n)){
            echo "$n is a perfect number\n"; echo "<br>";
        }
    }
}

function cek($v=null){
    if($v==null){
        return;
    }

    $txt=preg_split('/\n/', $v);
    $q=(int)$txt[0];
    if($q<1||$q>50){
        echo "q<1||q>50 !!";
        return;
    }
    $out="";

    for($i=1;$i<=$q;$i++){
        $out.=isPerfect((int)$txt[$i])."<br>";
    }
    echo $out;
}

cek($num);
?>