phpQuery错误处理

Question

I'm using phpQuery to scrape some information from a page based on user input, but I'm trying to set up error handling if the user enters in something that doesn't exist.

For example, the user enters an incorrect product number it may result in

Warning: file_get_contents([function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found in 

What can I use in an if statement to check for a phpQuery error in an instance like this?

For example

if(...error...){
    echo json_encode("error" => 'Incorrect value entered');
}

Answer 1

Try surrounding the logic you plan on using with the input in a try-catch block.

Something like:

try {
  <..insert your logic here..>
} catch (Exception $e) {
  echo json_encode("error" => "Incorrect value entered");
}