How to send multiple json response in php back to ajax - php

Question

<?php
session_start();
$conn =new mysqli("localhost","root","","registration");
$userid=isset($_POST['userid'])?$_POST['userid']:'';
//$re['success']=false;
$sql="call regtask2('$userid')";
$res=mysqli_query($conn,$sql);
$array = array();
if($res) {
while($row = mysqli_fetch_assoc($res))
{
$array[]=$row ;
$re['success']=true;
$re['userObj']['firstname'] = $row['firstname'];
}
}
else {
$re['success']=false;
}
if(isset($_SESSION['username']))
{
$sem=isset($_POST['sem'])?$_POST['sem']:'';
$fname=isset($_POST['fname'])?$_POST['fname']:'';
$year=isset($_POST['date'])?$_POST['date']:'';
$query = mysqli_query($conn,"select * from studentdetails inner join studentmarks on studentdetails.studentid=studentmarks.studentid where firstname='$fname' and sem='$sem'");
$re = array();
while ($row = mysqli_fetch_assoc($query))
{
print_r($row);
//$options['userObj'][]=$row;
}
}
echo json_encode ($re);
return;
?>
This is my full PHP code in this I need two json responses,
1> when I refresh the page
$sql="call regtask2('$userid')";
This query has to work and pass the response to the ajax, then I am using click button. When I use click button this query has to work and pass the response
$query = mysqli_query($conn,"select * from studentdetails inner join studentmarks on studentdetails.studentid=studentmarks.studentid where firstname='$fname' and sem='$sem'");
I this is poosible?

Answer 1

3 options:
Just split your php code. On refresh, load script1.php and for your other ajax call, load script2.php.
You will need to set identifiers for your calls. In your ajax, add an "is_submit=true" to the query. In your php, check that value.
Assign your return value to $return and return that.

Answer 2

It's simple just add second query result to your previous json !, also consider adding some validation into user input to prevent sql injection
getting userid from $_POST is really bad idea
<?php
session_start();
$conn =new mysqli("localhost","root","","registration");
$userid=isset($_POST['userid'])?$_POST['userid']:'';
//$re['success']=false;
$sql="call regtask2('$userid')";
$res=mysqli_query($conn,$sql);
$array = array();
$re = array();
if($res) {
$re['success']=true;
while($row = mysqli_fetch_assoc($res))
{
$array[]=$row ;
$re['userObj']['firstname'] = $row['firstname'];
}
}
else {
$re['success']=false;
}
if(isset($_SESSION['username']))
{
$sem=isset($_POST['sem'])?$_POST['sem']:'';
$fname=isset($_POST['fname'])?$_POST['fname']:'';
$year=isset($_POST['date'])?$_POST['date']:'';
$query = mysqli_query($conn,"select * from studentdetails inner join studentmarks on studentdetails.studentid=studentmarks.studentid where firstname='$fname' and sem='$sem'");
while ($row = mysqli_fetch_assoc($query))
{
$re['userObj'][]=$row;
//$options['userObj'][]=$row;
}
}
echo json_encode ($re);
return;
?>