在PHP中，使用file_get_contents && file_get_contents会返回不同的值吗？

I was doing a mild test with the file_get_contents. The aim is to test if 2 urls do exist then see if they both have a certain string in them.

Something like:

$check_url1 = "www.example_1.com";
$check_url2 = "www.example_2.com";


if( 
$view_loaded_url1= @file_get_contents($check_url1)&&
$view_loaded_url2= @file_get_contents($check_url2)  )                                                            
{

    var_dump($view_loaded_url1); //RETURNS boolean true 

    var_dump($view_loaded_url2); //Returns the Contents of the page i.e: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Str.....etc

How do you make both return the contents of the page and not the boolean?

Because there is a second if to check if they both contain a certain string.

Something like:

if(stristr($view_loaded_url1, 'I am the String') && stristr($view_loaded_url2, 'I am the String') {

//....This part cannot go through because $view_loaded_url1 and $view_loaded_url2 are returning different datatype

}

Is this a normal behavior?.... has anyone else encountered this?

SCREENSHOT: enter image description here

file_get_contents never returns true. It returns file (or URL) contents or false if the contents retrieval failed.

The reason that $view_loaded_url1 gets the value true is that the expression is evaluated as follows (see parentheses):

if( 
  $view_loaded_url1 = (@file_get_contents($check_url1) && ($view_loaded_url2 = @file_get_contents($check_url2))
  )

The fix is to group the operators:

if( 
  ($view_loaded_url1 = @file_get_contents($check_url1)) &&
  ($view_loaded_url2 = @file_get_contents($check_url2))
  )                                                            
{

file_get_contents is not reliable way of checking if the url exists or not. This function returns false boolean value for every non 2XX http response.

You better write your own function which would connect to the given url on port 80 via a socket and analyze the output or respond to the connection timeout. You can use the cURL as well.