目录一、基本语法二、主要功能三、常用选项四、使用示例五、whereis 与 which 的区别（重点）六、注意事项updatedb的作用whereis 是 linux 系统中一个非常有用的命令，用于定位二进制程序、源代码文件和手册页的
I have PHP function which checks to see if variables are set and then adds them onto my SQL query. However I am don\'t seem to be getting any results back?
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