gistfile1.txt

<?php

function generate_json_ld() {

	if ( ! is_single() ) {
		return null;
	}

	$data = [];

	$data["@context"]      = "https://schema.org";
	$data["@type"]         = "Article";
	$data["headline"]      = get_the_title();
	$data["description"]   = get_the_excerpt();
	$data["articleBody"]   = wp_strip_all_tags( apply_filters( 'the_content', get_the_content() ) );
	$data["datePublished"] = get_the_date( 'c' );
	$data["dateModified"]  = get_the_modified_date( 'c' );

	$data["publisher"] = array(
		"@type" => "Organization",
		"name"  => get_bloginfo( 'name' ),
		"logo"  => array(
			"@type" => "ImageObject",
			"url"   => "https://name.com/wp-content/uploads/2018/01/SmallLogo.jpg",
		),
	);

	$data["mainEntityOfPage"] = array(
		"@type" => "WebPage",
		"@id"   => get_bloginfo( 'url' )
	);

	$data["author"] = array(
		"@type" => "Person",
		"name"  => get_the_author_meta( 'display_name' ),
		"url"   => get_the_author_meta( 'user_url' ),
	);

	$data["image"] = array(
		"@type"  => "ImageObject",
		"url"    => get_the_post_thumbnail_url(),
		"width"  => 1400,
		"height" => 425
	);

	echo '<script class="my-json-markup" type="application/ld+json">' . wp_json_encode( $data ) . '</script>';
}

add_action( 'wp_head', 'generate_json_ld' );