Method overloading is the process of implementing Polymorphism in Object-Oriented Programming. A method can be overloaded on the basis of type of parameters, number of parameters, and an order of par
1.整数型参数，必须intval转义,用addslashes转义不行 2.字符串型参数，必须addslashes转义 3.执行系统命令的，必须 escapeshellarg 转义
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