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This article delves into executing SELECT queries and retrieving results in CodeIgniter's Query Builder, focusing on methods to assign query results to variables. By comparing chained vs. non-chained calls and providing detailed code examples, it explains techniques for handling single and multiple rows using functions like row_array() and result(). Emphasis is placed on automatic escaping and query security, with best practices for writing efficient, maintainable database code.

This article provides an in-depth exploration of technical solutions for implementing page redirection after successful Ajax requests. By analyzing the complete interaction flow between client-side JavaScript code and server-side PHP logic, it explains the conditional redirection mechanism based on response content in detail. The article covers jQuery Ajax success callback handling, server-side error validation logic, and comparisons of various redirection methods, offering developers comprehensive solutions and best practices.