The reason hackers and researchers search for this specific pattern is that it is the "smoking gun" for vulnerabilities.
Old-school search operators. The kind script kiddies used in 2010. The kind that still worked when no one was looking. inurl indexphpid
parameter is not properly sanitized, an attacker could manipulate the database query. Error Detection : It is often combined with other operators like intext:"Warning: mysql_fetch_array()" The reason hackers and researchers search for this