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This article mainly introduces what PHP means, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

PHP function

PHP has more than 1000 built-in functions. A function is a block of statements that can be reused in a program.

The function is not executed immediately when the page is loaded. The function is executed only when it is called.

PHP user-defined function

In addition to the built-in PHP function, we can create our own.

When PHP creates a user-defined function, the user-defined function declaration begins with the keyword "function":

/ / Syntax function functionName () {/ / executed code;} / * comment: function names can start with a letter or an underscore (instead of a number). Function names are not case-sensitive. The function name should reflect the task performed by the function. * / instance

Note: in this 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.

Parameters of PHP function

You can pass information to the function through parameters. Parameters are similar to variables.

Parameters are defined after the function name, and any number of parameters can be added inside the parentheses, as long as they are separated by commas.

Note: the function in this example takes one argument ($fname). When we call the familyName () function, we also pass a first name (for example, Bill), which outputs a different first name, but the last name is the same. The function in the following example takes two arguments ($fname and $year):

PHP default parameter valu

If we call the setHeight () function with no arguments, its parameters will take the default value:

PHP function-return value

To get the function to return a value, use the return statement:

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