<?php  

$row = mysql_query('select * from user');  
  
$data_row = ();//execute the query  
$json_data=array();//create the array  
foreach($row as $rec)//foreach loop  
{  
$json_array['id']=$rec['id'];  
    $json_array['name']=$rec['name'];  
    $json_array['roll_no']=$rec['roll_no'];  
    $json_array['degree']=$rec['degree'];  
//here pushing the values in to an array  
    array_push($json_data,$json_array);  
  
}  
  
  
echo json_encode($json_data);  
  
  
?>