sourcecodester PHP CRUD without Refresh/Reload using Ajax and DataTables Tutorial is an open source project to help people learn how to build or develop a PHP CRUD without refresh/reload using Ajax and DataTables. sourcecodester PHP CRUD without Refresh/Reload using Ajax and DataTables Tutorial is vulnerable to SQL injection, which can be exploited by remote attackers to execute arbitrary code via the first_name, last_name and email parameters to /ajax_crud.