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if( !function_exists( 'the_field' ) ) {
  add_action( 'admin_notices', 'my_acf_notice' );
}

function my_acf_notice() {
  ?>
  <div class="update-nag notice">
      <p><?php _e( 'Please install Advanced Custom Fields, it is required for this plugin to work properly!', 'my_plugin_textdomain' ); ?></p>
  </div>
  <?php

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if( !function_exists( 'the_field' ) && empty( get_option( 'my-acf-notice-dismissed' ) ) ) {
  add_action( 'admin_notices', 'my_acf_admin_notice' );
}

function my_acf_admin_notice() {
    ?>
    <div class="notice error my-acf-notice is-dismissible" >
        <p><?php _e( 'ACF is not necessary for this plugin, but it will make your experience better, install it now!', 'my-text-domain' ); ?></p>
    </div>

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add_action( 'wp_enqueue_scripts', 'my_plugin_assets' );

function my_plugin_assets() {
	wp_enqueue_script( 'my-notice-update', plugins_url( '/js/notice-update.js', __FILE__ ), array( 'jquery' ), '1.0', true  );
}

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jQuery(document).on( 'click', '.my-acf-notice .notice-dismiss', function() {

    jQuery.ajax({
        url: ajaxurl,
        data: {
            action: 'my_dismiss_acf_notice'
        }
    })

})

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add_action( 'admin_init', 'my_detect_acf' );
function my_detect_acf() {
	if( !function_exists( 'the_field' )) {
		delete_option( 'my-acf-notice-dismissed' );
	}
}

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add_action( 'wp_dashboard_setup', 'register_my_dashboard_widget' );
function register_my_dashboard_widget() {
	wp_add_dashboard_widget(
		'my_dashboard_widget',
		'My Dashboard Widget',
		'my_dashboard_widget_display'
	);

}

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function register_my_dashboard_widget() {
 	global $wp_meta_boxes;

	wp_add_dashboard_widget(
		'my_dashboard_widget',
		'Publication Schedule',
		'my_dashboard_widget_display'
	);

 	$dashboard = $wp_meta_boxes['dashboard']['normal']['core'];

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<div class="comment-stat-bars">
    <div class="comment-stat-bar"></div>
    <div class="comment-stat-bar"></div>
    <!-- etc... -->
</div>
<div class="comment-stat-labels">
    <div class="comment-stat-label">comment count here</div>
</div>
<div class='comment-stat-caption'>Comments in the past 5 weeks</div>

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add_action( 'admin_enqueue_scripts', 'dashboard_widget_display_enqueues' );
function dashboard_widget_display_enqueues( $hook ) {
	if( 'index.php' != $hook ) {
		return;
	}

	wp_enqueue_style( 'dashboard-widget-styles', plugins_url( '', __FILE__ ) . '/widgets.css' );
}

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.comment-stat-bars {
    overflow:hidden
}

.comment-stat-bar {
    margin:0 1%;
    background-color: #2ea2cc;
    border-top-color: #fff;
    border-top-style: solid;
    float:left;