How to call method in php

PHP is a popular server-side scripting language that is often used in web development. Methods (functions) in PHP are very useful in performing specific tasks and can be used repeatedly.

There are two ways to call a method in PHP: direct call and indirect call. Below we will introduce these two methods one by one.

Directly calling a method

Directly calling a method means calling a method directly using the method name. For example, we have a method named "hello", we can use the following code to call the method directly:

hello();

The above code is feasible provided that the method has been declared and defined in the code. To declare a method in PHP, you need to use the "function" keyword, for example:

function hello(){
    echo 'Hello world!';
}

When we call the 'hello()' method, the program will output "Hello world!" to the browser.

Indirectly calling methods

You can use string names to call methods indirectly. In this case, we need to use the "call_user_func" or "call_user_func_array" function to achieve this. Both functions require passing the method name and possible parameters as arguments.

The following is an example of calling a method using the "call_user_func()" method:

call_user_func('hello'); // 输出“Hello world！”到浏览器上

The following is an example of calling a method using the "call_user_func_array()" method, where the second parameter is a containing method Array of parameters:

call_user_func_array('hello', array($arg1, $arg2));

When we use either of these two methods, we need to ensure that the method has been declared and defined, otherwise an error will occur.

Conclusion

No matter which way we call the PHP method, we need to ensure that the method has been defined and called with the correct method name and parameters. In large PHP applications, the correct calling of methods is often one of the keys to optimizing code or solving problems.

The above is the detailed content of How to call method in php. For more information, please follow other related articles on the PHP Chinese website!