When I insert value then only last value stored - php

Question

<?php
include("connection.php");
// Collect services.
$serviceid = "select * from service";
$servicevalue = $conn->query($serviceid) or die ($conn->error.__LINE__);
$services = [];
while ($row = $servicevalue->fetch_assoc()) {
$services[] = $row;
}
// Collect activities.
$activityid = "select * from activity";
$activityvalue = $conn->query($activityid) or die ($conn->error.__LINE__);
$activities = [];
while ($row = $activityvalue->fetch_assoc()) {
$activities[] = $row;
}
// Collect something else?
$perid = "select * from periodicity";
$pervalue = $conn->query($perid) or die ($conn->error.__LINE__);
$pers = [];
while ($row = $pervalue->fetch_assoc()) {
$pers[] = $row;
}
foreach ($services as $service):
?>
<form method="post" action="doalert.php" name="test">
<ul>
<li>
<input name='arr[1][service]' type='checkbox' data-id='Incometax'value="<?php echo $service['service_id']?>"/><?php echo $service['servicename']?>
<ol>
<li>
<?php foreach ($activities as $activity) : ?>
<input type='checkbox' name='arr[1][activity][]' value="<?php echo $activity['activity_id']?>" /><?php echo $activity['nameofactivity'];?>
</li>
<br>
<?php endforeach;?>
</ol>
</li>
</ul>
<br>
<?php endforeach;?>
<input type="submit" name="submit" value="Submit"/>
</form>
The value of services and activity come from the database, I want to store all the services and related activity in DB serviceactivitymap table, here is my php code but when I store the data then last checked service value only stored with all the activity checked
incometax
filling
return
gst
filling
return
If incometax,gst,filling,return is checkboxes then when we check :
incometax->filling,return and gst->filling,return
Then the code only store
gst->filling,return and gst->filling,return
Instead of :
incometax->filling,return and gst->filling,return

Answer 1

You need to pass the service_id to the activity name like :
<input type='checkbox' name='activity[<?php echo $service['service_id']?>][]' value="<?php echo $activity['activity_id']?>" /><?php echo $activity['nameofactivity'];?>
Full form will be like :
<form method="post" action="doalert.php" name="test">
<?php foreach ($services as $service): ?>
<ul>
<li>
<input name='service[]' type='checkbox' data-id='Incometax' value="<?php echo $service['service_id']?>"/><?php echo $service['servicename']?>
<ol>
<?php foreach ($activities as $activity): ?>
<li>
<input type='checkbox' name='activity[<?php echo $service['service_id']?>][]' value="<?php echo $activity['activity_id']?>" /><?php echo $activity['nameofactivity'];?>
</li>
<?php endforeach;?>
</ol>
</li>
</ul>
<?php endforeach;?>
<input type="submit" name="submit" value="Submit"/>
</form>

Answer 2

In your code, the form start tag is created every time a loop runs as it is inside the service foreach. Try taking it outside the loop
Also, the name you used for service input tag as arr[1]["service"] will be overwritten everytime the loop runs. Instead I would suggest if you can use a variable increment in each loop like
$i=0;
foreach($services as $service)
{
.....
<input name='arr[$i][service]' ......
$i++;
}
This will differentiate the input tag name and saving may happen properly.