Question

When I try to include a file using include_once in php which shows warning like

Warning: include_once(1) [function.include-once]: failed to open stream: No such file or directory in /var/www/test/content_box.php on line 2

Actually file is there in my directory.I am using ubuntu (OS)
How can we prevent this warning?

Answer 1

Note: My answer below has turned out to be popular, but I didn’t really answer the question properly. It’s not about suppressing the warning, it’s about fixing the bug that caused the warning. I’ll leave it here for posterity.

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The proper way to prevent the warning would be to check if the first exists first and don’t try to include it if it doesn’t.

if (file_exists($includefile)) {
  include_once($includefile);
}

(obviously replace $includefile with the file you’re including)

The quick and dirty way to do it, which I DO NOT recommend, would be to suppress the warning with the @ expression.

@include_once($includefile);

Note that when suppressing a warning this way, PHP’s error handling code still runs but with PHP’s error_reporting ini value temporarily changed to ignore it. As a rule of thumb this isn’t a good idea because it can mask other errors.

As others have pointed out, “1” is an unusual filename for a PHP file, but I’ll assume you have a specific reason for doing that.