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This article mainly introduces "the brief introduction of the parameters of the PHP function". In the daily operation, I believe that many people have doubts about the simple introduction of the parameters of the PHP function. The editor has consulted all kinds of materials and sorted out the simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts of "the simple introduction of the parameters of the PHP function". Next, please follow the editor to study!

Function parameter

When calling a function, you need to pass parameters to the function, the parameters passed in are called arguments, and the parameters defined by the function are formal parameters. There are three ways to pass function parameters in PHP: by value, by reference, and by default.

1. Pass by value

The parameter passed by value is equivalent to the backup of this parameter inside the function. Even if you change the value of the parameter inside the function, it will not change the value outside the function, eg:

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