how to create update checkbox value from database to check on checkbox using php javascript

Give me some examples how to update checkbox form by retrieve value from database and do if value=1 i want input type="checkbox" name="apple" value="1" Apple=checked.

<form action="update.php" method="post">
    <input type="checkbox" name="apple" value="1">Apple <br>
    <input type="checkbox" name="orange" value="2">Orange <br>
    <input type="checkbox" name="banana" value="3">Banana <br>
    <button type="submit" name="submit" value="submit">Save</button>