Facebook Like button code snippet for WordPress

wp-facebook-like-button-snippet.php

<?php

add_filter('the_content', function ($content) {
	
	$combine_fn = function ($glue, $pattern, $array) {
		return implode($glue, array_map(function ($value, $key) use ($pattern) {
			$ret = $pattern;
			
			$ret = str_replace('{$key}',   $key,   $ret);
			$ret = str_replace('{$value}', $value, $ret);
			
			return $ret;
		}, $array, array_keys($array)));
	};
	
	if(is_singular('post')) {
		
		// Edit values below
		
		$width  = 450;
		$height = 80;
		
		$params = [
			'layout'     => 'standard',
			'action'     => 'like',
			'size'       => 'small',
			'show_faces' => 'true',
			'share'      => 'false',
		];
		
		$styles = [
			'border'   => 'none',
			'overflow' => 'hidden',
		];
		
		$attributes = [
			'scrolling'         => 'no',
			'frameborder'       => '0',
			'allowTransparency' => 'true',
			'allow'             => 'encrypted-media',
		];
		
		// Stop editing here
		
		$params['href']       = get_the_permalink();
		
		$attributes['width']  = $params['width']  = $width;
		$attributes['height'] = $params['height'] = $height;
		
		$attributes['src']    = "https://www.facebook.com/plugins/like.php?" . http_build_query($params);
		
		$attributes['style']  = $combine_fn('; ', '{$key}: {$value}', $styles);
		
		$attributes_combined  = $combine_fn(' ', '{$key}="{$value}"', $attributes);
		
		$content .= "<iframe {$attributes_combined}></iframe>";
		
	}
	
	return $content;
	
});