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This article will explain in detail how to create user-defined functions in PHP. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Create user-defined functions in PHP

User-defined function declarations begin with the word "function":

Grammar

Function functionName () {code executed;}

Note: function names can start with a letter or an underscore (not a number).

Note: function names are not case-sensitive.

Tip: the function name should reflect the task performed by the function.

In the following example, we create a function named "writeMsg ()". The open curly braces ({) indicate the beginning of the function code, while the closed curly braces (}) indicate the end of the function. This function outputs "Hello world!". To call this function, simply use the function name:

Example

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