autoload.php

<?php

if ( !defined( 'ABSPATH' ) ) {
	header( 'HTTP/1.0 403 Forbidden' );
	exit;
}
if (
	is_array( spl_autoload_functions() )
	&& in_array( '__autoload', spl_autoload_functions() )
) {
	spl_autoload_register( '__autoload' );
}
if ( !function_exists( 'wpss_autoload' ) ) {
	function wpss_autoload( $dir ): void {
		if ( !file_exists( "$dir/composer.json" ) ) {
			return;
		}
		if ( file_exists( ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php' ) ) {
			require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php';
		}
		if ( file_exists( ABSPATH . 'wp-admin/includes/class-wp-filesystem-direct.php' ) ) {
			require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-direct.php';
		}
		$content    = new WP_Filesystem_Direct( false );
		$composer   = $content->get_contents( WPSS_URCM_PLUGIN_PATH . "composer.json" );
		$composer   = json_decode( $composer, true );
		$namespaces = $composer['autoload']['psr-4'] ?? [];
		foreach ( $namespaces as $namespace => $classpaths ) {
			if ( !is_array( $classpaths ) ) {
				$classpaths = [ $classpaths ];
			}
			spl_autoload_register( function( $classname ) use ( $namespace, $classpaths, $dir ) {
				if ( preg_match( "#^" . preg_quote( $namespace ) . "#", $classname ) ) {
					$classname = str_replace( $namespace, "", $classname );
					$filename  = preg_replace( "#\\\\#", "/", $classname ) . ".php";
					foreach ( $classpaths as $classpath ) {
						$full_path = $dir . "/" . $classpath . "/$filename";
						if ( file_exists( $full_path ) ) {
							include_once $full_path;
						}
					}
				}
			} );
		}
	}
}