Category: PHP

Useful predefined PHP functions

print_r(get_defined_vars());

get_defined_vars — Returns an array of all defined variables 

print_r(get_defined_functions());

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.

print_r(get_defined_constants());

get_defined_constants – Returns list all defined constants with their respective values

print_r(get_declared_classes());

get_declared_classes – Returns list all declared classes

print_r(memory_get_usage());

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:

<?php
 
   /*
 
   Plugin Name: myPlugin Creator
 
   Plugin URI: http://www.nikolaynikolov.net
 
   Description: My fist plugin
 
   Version: 1.2
 
   Author: Nikolay Nikolov
 
   Author URI: http://www.nikolaynikolov.net
 
   License: GPL2
 
   */

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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