Currently include_once() returns 1 the first time a file is included and NULL the second time (when the file is already included) but NULL is also returned if an error occurs when including the file (file not found, parse error etc).

I?d like include_once() to return 1 or even better, TRUE, if the file was succesfully included or if it?s already included and FALSE if an error occured.

<?php
// Returns 1, evaluates to TRUE
if(include_once('myfile.php')) {
	echo "SUCCESS\n";
}
else {
	echo "FAILURE\n";
}

// Returns NULL, evaluates to FALSE
if(include_once('myfile.php')) {
	echo "SUCCESS\n";
}
else {
	echo "FAILURE\n";
}
?>