Force plugin to fail activation

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I’m writing a plugin that will be using custom fields added by a theme.

Because of this, it would be ideal if my plugin not be able to activate should these fields not exist.

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How do I go about displaying an error and forcing the activation to fail?

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  1. Code like this can do the trick.

    function plugin_activation_check(){
    if ( some_check_here() ) {
        // this is the fail case
        deactivate_plugins(basename(__FILE__)); // Deactivate ourself
        wp_die("Message to user.");
    }
}
register_activation_hook(__FILE__, 'plugin_activation_check');