Plugin activated/deactivated hooks sample

plugin-activated-deactivated-hooks-sample.php

<?php
// Let's assume this is your main plugin file
register_activation_hook( __FILE__, array( 'YOURTEXTDOMAIN', 'function_to_call_upon_activation' ) );
//register_activation_hook( __FILE__, array ( $my_class, 'function_to_call') ); // If inside a Class

function function_to_call_upon_activation() {
  // Check PHP Version and deactivate & die if it doesn't meet minimum requirements.
    if ( version_compare( PHP_VERSION, '5.4', '<=' ) ) {
        deactivate_plugins( plugin_basename( __FILE__ ) );
        add_action( 'admin_notices', 'my_plugin_notice' );
        //wp_die( __( 'This plugin requires PHP Version 5.4 or greater.  Sorry about that.', 'textdomain' ) );
    }
  // Do other stuff here
}

register_deactivation_hook( __FILE__, array( 'YOURTEXTDOMAIN', 'function_to_call_upon_deactivation' ) );
function function_to_call_upon_deactivation() {
  // require woocommerce
    if ( is_admin() && current_user_can( 'activate_plugins' ) &&  !class_exists( 'woocommerce' ) ) {
        add_action( 'admin_notices', 'my_plugin_notice' );
        deactivate_plugins( plugin_basename( __FILE__ ) ); 
    }
   // Do other stuff here
}
function my_plugin_notice() {
    ?><div class="error"><p><?php esc_html_e('Error notice text here', GBSBOOKING_TEXTDOMAIN) ?></p></div><?php
}