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I want to create a custom WP CLI command and I have read the documentation but I just don't understand for the life of me how this works.

Do I need to declare it before in my config file where they are gonna go?

Is it a PHP file? If so, I need to declare it put it anywhere inside my theme?

Thank you in advance.

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You can put the PHP anywhere in your plugin, or a file that's included into your plugin, the same as you would any other code for extending any part of WordPress in a plugin. The only thing you need to do is check that WP_CLI exists before using any of the WP CLI API:

if ( defined( 'WP_CLI' ) && WP_CLI ) {
    // WP_CLI::add_command etc.
}
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  • Can I include this as a theme file and call it within functions.php? Commented Nov 28, 2019 at 16:58
  • Yes. It will work in themes too. Commented Nov 28, 2019 at 22:41

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