PHP返回是添加空格，即使是trim（）

Question

I have a function that should report a boolean, but it's adding spaces to the front of the string. Even with trim(), the spaces remain... What is causing this?

PHP

function a($v){
  $r = is_file($v) ? 1 : 0;
  return(trim($r));
}

JS

$.ajax(url+query,{ success:function(data){ return(data); } });

Output

    1

Update

I'm invoking using $_GET, calling the function depending on the parameter past in the query. This is the first time I've had this issue, everything else works fine. I don't think this has any thing to do with spaces in the file - it doesn't occur anywhere else, and I'm only returning what's in the function..

Answer 1

You must have spaces in the PHP files you include. You must encode your file in UTF8 without Bom. And remove "?>" at the end of your files.

Verify all your files, or you can use :

function a($v){
  $r = is_file($v) ? 1 : 0;
  ob_clean();
  return $r;
}

But this is the easy way, don't use ob_clean() and verify your files ! :)