Description:
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In the PHP manual on page https://www.php.net/manual/en/language.operators.errorcontrol.php the first example has an expression that uses the $php_errormsg variable, as shown below.

$my_file = @file ('non_existent_file') or
    die ("Failed opening file: error was '$php_errormsg'");

The manual does say that this $php_errormsg variable is set only if "track_errors" feature is enabled. However, I found out that it is actually a deprecated feature now. I was slightly confused when I got an error -- Undefined variable: php_errormsg -- when the example teaches me how to ignore errors.

I think that another example might serve as a better introduction to the '@' operator, while this existing one can be shown later as a relic of the past the reader might see around.