HTTP 500 server errors on PHP 8.1

Line 85 in all-404-redirect-to-homepage.php throws uncaught PHP TypeError exception on PHP 8.1 causing server 500 error/crashes

These two lines:
$f = @fopen( $file, ‘r+’ );
$filestr = @fread($f , filesize($file));

If fopen() returns false, $f becomes false, which throws TypeError on the next line even though the error suppression operator “@” is used.

Note that this is probably specific to PHP 8 since it’s more strict about error handling.