好像db_clean()是一个正在调用的自定义助手xss_clean().
查看此链接, db_clean()存储在MY_security_helper.php中,其中MY_是扩展本机帮助程序的命名约定.
Run Code Online (Sandbox Code Playgroud)xss_clean() Provides Cross Site Script Hack filtering. This function is an alias to the one in the Input class. More info can be found there.
资料来源:https://www.codeigniter.com/user_guide/helpers/security_helper.html
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