yurike

<?php

$nama = [
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]",
    "[email protected]"
];

$utang = [
    array('email'=>"[email protected]"),array('email'=>'[email protected]'),array('email'=>'[email protected]')
];

$email_utang = [];

foreach($utang as $item){
    array_push($email_utang,$item['email']);
}

print_r($email_utang);

?>

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>
    <link rel="stylesheet" href="">
</head>
<body>
    <select name="" multiple>
        <?php foreach($nama as $item){
            if(!in_array($item, $email_utang)){
                ?>
                <option value="<?php echo $item;?>"><?php echo $item;?></option>
                <?php
            }
        }
        ?>
    </select>
</body>
</html>