php checkbox checked on edit page - php

Question

I have 3 tables:
people:
------------------------
peopleID,
firstname
peopletype:
------------------------
peopletypeID,
type
peoplepeopletype (junction table):
------------------------
peopleID,
peopletypeID
On the add form everything is fine, but I have problem to display checkboxes checked for the assigned peopletype
Here is my code.
Retrieve data from peoplepeopletype table :
/*PEOPLE TYPE ************* */
$stmt = $conn->prepare("SELECT * FROM peoplepeopletype WHERE peopleID=?");
// set parameters and execute
if ( !$stmt ) { echo "error"; }
else if ( !$stmt->bind_param('i', $_GET['peopleID']) ) { echo "error";}
else if ( !$stmt->execute() ) { echo "error"; }
else {
$result = $stmt->get_result();
while($row = $result->fetch_assoc()) {
$peopletypeIDfromdb = $row ['peopletypeID'];
echo $peopletypeIDfromdb; /*echo only for test purposes, but I don't know how to use this in the form */
}
} /* end else */
Display checkboxes :
<?php /*retrieve peopletype from db */
$sql = "SELECT * from peopletype";
$result = $conn->query($sql);
while($row = $result->fetch_assoc()) {
echo '<input required="required" type="checkbox" name="peopletypeID[]" value="' . $row["peopletypeID"] . '"';
if ($peopletypeIDfromdb = $row["peopletypeID"]) { /*problem is probably here*/
echo 'checked';
}
echo '>' . $row["type"];
}
?>
Thanks for your help!

Answer 1

If you can have multiple types attached to 1 person, you'll need to change the first loop to store all of them in an array. I store them as keys to have the minimum complexity of checking the existence of certain type in the future among the types assigned to the person.
$result = $stmt->get_result();
$types = array();
while($row = $result->fetch_assoc()) {
$types[$row ['peopletypeID']] = 1;
}
And then use it inside the second loop:
while($row = $result->fetch_assoc()) {
echo '<input required="required" type="checkbox" name="peopletypeID[]" value="' .
$row["peopletypeID"] . '" ';
if(isset($types[$row["peopletypeID"]]))
{
echo 'checked';
}
echo '>' . $row["type"];
}