一个php文件中的两个事件功能

Question

Hi I'm new to php and jquery. Pardon my php vocabulary.

I have two events in my js file.

1) onsubmit: submits the user entered text to result.php which queries database and displays result. (result.php?name=xyz)

2) onkeyup: makes an ajax call to the same result.php which queries a url and gets json data. (result.php?key=xyz)

My question is if I can check for isset($_GET['key']) in result.php, query url and return json and the rest of the php is not parsed. Basically is there anything like return 0 as in case of C programming.

The question may seem silly, anyway I can have 2 different php files, but I want to know if it's possible. Thanks in advance :)

<form action = "result.php" method = "get">
<input type = "text" id = "name" >
<input type = " submit">
</form>
<script>
$('#name').on('keyup',function (e){
   input_val = $(this).val();
   $.ajax({
      url: "result.php?key=" + input_val,
      success: function(data){
      alert(data);
      }
  });
});

</script>

Answer 1

If I well understand, you want to know a way to use only one PHP script being able to process either Ajax and "normal" (returning whole page) tasks.

So if yes, this can be easily achieve, using the following schema:

//... some initialization, if needed
if (isset($_GET['key'])) {
  // ... do the job for creating the expected Ajax response, say $ajax_response
  echo $ajax_response;
  exit;
  // nothing else will happen in the current script execution
}
// otherwhise you can do all "normal" job here, as usual...