Custom WordPress login logo

class-mc-login-logo.php

<?php

namespace Chouinard\Logo;

/**
 * Class MCLoginLogo
 * @package Chouinard\Logo
 */
class MCLoginLogo {

	private $logo_path;
	private $logo;
	private $width;
	private $height;

	/**
	 * MCLoginLogo constructor.
	 */
	public function __construct() {

		// Set logo path.
		$this->logo_path = '/login-logo.png';
		$this->width     = '312px';
		$this->height    = '100px';

		// Link login logo to home URL.
		add_filter(
			'login_headerurl',
			[ $this, 'header_url' ]
		);
		// Add remaining filters only if we have a logo file.
		if ( $this->logo = get_stylesheet_directory_uri() . $this->logo_path ) {
			add_filter(
				'login_headertext',
				'__return_empty_string'
			);
			add_action(
				'login_head',
				[ $this, 'login_logo' ]
			);
		}

	}

	/**
	 * URL for logo anchor
	 *
	 * @param $url
	 *
	 * @return string
	 * @since 1.0.0
	 */
	public function header_url( $url ) {

		return esc_url( home_url() );
	}

	/**
	 * Output CSS for login logo
	 *
	 * @return void
	 * @since 1.0.0
	 */
	public function login_logo() {

		if ( ! file_exists( get_stylesheet_directory() . $this->logo_path ) ) {
			return;
		}

		?>
		<style type="text/css">
			.login h1 a {
				background-image: url(<?php echo $this->logo;?>);
				background-size: contain;
				background-repeat: no-repeat;
				background-position: center center;
				display: block;
				overflow: hidden;
				text-indent: -9999em;
				width: <?php echo $this->width ?>;
				height: <?php echo $this->height ?>;
			}
		</style>
		<?php

	}
}