Useful predefined PHP functions


get_defined_vars — Returns an array of all defined variables


get_defined_functions — Returns an array of all defined functions

You should be careful about the location in the code, because if you are inside a function it will work only for this function.


get_defined_constants – Returns list all defined constants with their respective values


get_declared_classes – Returns list all declared classes


memory_get_usage — Returns the amount of memory allocated to PHP

Create WordPress Plugin

To create a plugin, all you need to do is create a folder and then create a single file. First go to the wp-content/plugins folder, and create a new folder named myPlugin. Inside this new folder, create a file named myPlugin.php. Open the file in a text editor, and paste the following information in it:

You can go into the back end to activate your plugin. Of course, this plugin doesn’t do anything, but you can add functionality by yourself.
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