[WordPress] Add AdSense ads to blog sample

my-adsense.php

<?php
/*
Plugin Name: My AdSense
Description: adsense表示
Author: Takuro Hishikawa
Version: 0.2
Author URI: http://notnil-creative.com/
*/

// add adsbygoogle.js to footer
function script_adsbygoogle() {
echo '<script async src="http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>';
}
add_action('wp_footer', 'script_adsbygoogle', 100);

// add widget
class My_Adsense_Widget extends WP_Widget {
	public function __construct() {
		parent::__construct(
			'my-adsense-id',
			'My AdSense Widget',
			array(
				'classname' => 'my-adsense-widget'
			)
		);

	}
	public function widget( $args, $instance ) {
		echo '<ins class="adsbygoogle"
			style="margin-bottom:20px;display:inline-block;width:250px;height:250px"
			data-ad-client="ca-pub-0000000000000000"
			data-ad-slot="0000000000"></ins>';
		echo '<script>
			(adsbygoogle = window.adsbygoogle || []).push({});
			</script>';
	}
}
add_action( 'widgets_init', create_function( '', 'register_widget("My_Adsense_Widget");' ) );

// add ad to content in single after the more anchor
function add_adsense_to_content($content){
	$has_more = strpos($content, '<span id="more');
	
	// setup adsense code
	$adsense = '';
	if ( !wp_is_mobile() && is_singular() ) {
		$adsense = '<ins class="adsbygoogle"
			style="display:inline-block;width:468px;height:60px"
			data-ad-client="ca-pub-0000000000000000"
			data-ad-slot="0000000000"></ins>';
	} elseif ( wp_is_mobile() && is_singular() ) {
		$adsense = '<div style="margin:0 -1.714285714rem 20px -1.714285714rem;text-align:center;width:100%;overflow:hidden;">
			<ins class="adsbygoogle"
			style="display:inline-block;width:320px;height:50px;margin:0 auto;"
			data-ad-client="ca-pub-0000000000000000"
			data-ad-slot="0000000000"></ins>
			</div>';
	}
	
	// add adsense code in content
	if ( $adsense != '' ) {
		$adsense .= '<script>
			(adsbygoogle = window.adsbygoogle || []).push({});
			</script>';
		if ( $has_more !== false) {
			$pattern = '/<p><span id\=\"(more\-\d+)"><\/span><\/p>/iu';
			$replacement = '<p><span id="$1"></span></p>' . "\n" . $adsense;
			$content = preg_replace($pattern, $replacement, $content);
		} elseif ( wp_is_mobile() ) {
			$content = $adsense . $content;
		} elseif ( ! wp_is_mobile() ) {
			$content .= $adsense;
		}
	}
	
	return $content;
}
add_filter('the_content', 'add_adsense_to_content', 10);