Several questions about php4. If you have been familiar with php4, please help me to answer them. Thank you very much.

Several questions about php4. If you have been familiar with php4, please help me to answer them. Thank you very much.

First:

Does php4 support static methods and attributes?

Second:
Does php4 have no destructor? If not, how do you solve some issues that must use destructor? For example, shut down the database.

Third:
If you write programs compatible with php4 and php5, what do you need to pay attention?

Thank you for your support! I have no time to install php4 and test it myself!

Let me answer




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Read the manual.

There is a function that triggers the function at the end of script execution.

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If you shut down the database, you don't need to use pcconnect, And it will shut down itself. If you don't have to write a function