The method in the php class does not exist

The method in the php class does not exist? PHP determines whether a function in a class exists?

1. First, you need to create a new 246.php.

#2. Then you need to enter the structure of the php web page according to the code shown ().

#3. Then you need to declare the file type and encoding for PHP to interact with the browser according to the code shown in the figure.

4. The function_exists() function: Returns TRUE if the function has been defined, as shown in the figure with its syntax structure.

#5. Then you need to use the function_exists() function according to the code shown in the figure to determine whether the show() function has been defined.

#6. Run the web page and output the judgment result of the function_exists() function. As shown in the figure, the function does not exist.

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