You can "try" it;)
<?php
function exceptions_error_handler($severity, $message, $filename, $lineno) {
throw new ErrorException($message, 0, $severity, $filename, $lineno);
}
set_error_handler('exceptions_error_handler');
try {
include 'somefile.php';
$included = true;
} catch (Exception $e) {
$included = false;
}
echo 'File has ' . ($included ? '' : 'not ') . 'been included.';
?>
, $included true, false catch. , $includes .