run ajax php using jquery code example

Example 1: ajax project using php and jquery

<?php
if (isset($_POST['username']) && $_POST['username'] && isset($_POST['password']) && $_POST['password']) {
    // do user authentication as per your requirements
    // ...
    // ...
    // based on successful authentication
    echo json_encode(array('success' => 1));
} else {
    echo json_encode(array('success' => 0));
}

Example 2: ajax project using php and jquery

<script>
var objXMLHttpRequest = new XMLHttpRequest();
objXMLHttpRequest.onreadystatechange = function() {
  if(objXMLHttpRequest.readyState === 4) {
    if(objXMLHttpRequest.status === 200) {
          alert(objXMLHttpRequest.responseText);
    } else {
          alert('Error Code: ' +  objXMLHttpRequest.status);
          alert('Error Message: ' + objXMLHttpRequest.statusText);
    }
  }
}
objXMLHttpRequest.open('GET', 'request_ajax_data.php');
objXMLHttpRequest.send();
</script>