Class with function definiiton

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PHP

I was trying to pullout the content of all the functions defined from the class segment in segment.php. And calling all the three functions from a class segment in home_segment.php Is this a correct way of calling multiple functions from one class.

Or suggest with good OOP's concept. How could I improve the above similar functionality in Object Oriented Programming.

What I have tried:

segment.php

<?php
$mysqli = mysqli_connect("localhost","root","","squarellt");
 $cid = required_param('id', PARAM_INT);
 class segment
 {   
   public function unitseg_set1()
   {          
	 $subject = $mysqli->query('SELECT * FROM order_subject WHERE id='.$cid.'');     
	 while($row=$subject->fetch_array() )
	 {
        echo '<div>'.$row['chem_name'].'</div>';
     }	 
   }
   
   public function unitseg_set2()
   {          
	 $subject = $mysqli->query('SELECT * FROM order_subject WHERE id='.$cid.'');     
	 while($row=$subject->fetch_array() )
	 {
        echo '<div>'.$row['physiotherapy_nn'].'</div>';
     }	 
   }   

   public function unitseg_set3()
   {          
	 $subject = $mysqli->query('SELECT * FROM order_subject WHERE id='.$cid.'');     
	 while($row=$subject->fetch_array() )
	 {
        echo '<div>'.$row['commun_gg'].'</div>';
     }	 
   }   
 }
 ?>

home_segment.php

   

require_once('segment.php');
   $acc = new segment();
   $account1 = $acc->unitseg_set1();
   $account2 = $acc->unitseg_set2();
   $account3 = $acc->unitseg_set3();
   
   echo $account1;

   echo $account2;

   echo $account3;