Codeigniter echo / var_dump无法正常工作(Codeigniter echo/var_dump not working)

 为什么var_dump不在这里工作，ajax调用成功，但没有打印，甚至没有PHP的字符串文字打印。 
 
 我的控制器 
 
function check_links() {            
  $matches = $this->input->get('matchesJSON');        
  var_dump($matches);
  //$this->load->view('publish_links_view');
}
 
 Ajax调用 
 
$.ajax({
  type: 'GET',
  dataType: 'json',
  cache: false,
  data: 'matchesJSON='+matchesJSON,
  url: 'publishlinks/check_links',
  success:                    
    function(response) {

    }
})    

Why doesn't var_dump work here, the ajax call is successful, but there is nothing printed, not even a string literal print from the PHP.
 
My controller
 
function check_links() {            
  $matches = $this->input->get('matchesJSON');        
  var_dump($matches);
  //$this->load->view('publish_links_view');
}
 
Ajax call
 
$.ajax({
  type: 'GET',
  dataType: 'json',
  cache: false,
  data: 'matchesJSON='+matchesJSON,
  url: 'publishlinks/check_links',
  success:                    
    function(response) {

    }
})    

原文：https://stackoverflow.com/questions/7000490