PHP PSR-4 Autoloader Example

autoload.php

<?php

ini_set('display_errors', 1); ini_set('display_startup_errors', 1); error_reporting(E_ALL);

/**
 * Custom PSR-4 autoloader
 * 
 * @param array $packages: array of packages
 * @source https://github.com/Wilkins/composer-file-loader
 */
function loadPsr4Packages($packages)
{
    foreach ($packages as $namespace => $classpaths) {
        if (!is_array($classpaths)) {
            $classpaths = array($classpaths);
        }

        spl_autoload_register(function ($classname) use ($namespace, $classpaths) {
            // Check if the namespace matches the class we are looking for
            if (preg_match("#^" . preg_quote($namespace) . "#", $classname)) {
                // Remove the namespace from the file path since it
                $classname = str_replace($namespace, "", $classname);
                $filename = preg_replace("#\\\\#", "/", $classname) . ".php";

                foreach ($classpaths as $classpath) {
                    $fullpath = __DIR__ . $classpath . "/$filename";

                    if (file_exists($fullpath)) {
                        require_once $fullpath;
                    }
                }
            }
        });
    }
}

$myPackages = [
    //package namespace   =>  package target folder
    'Spatie\\SchemaOrg\\' => '/./schema-org-3.1.0/src/'
];

loadPsr4Packages($myPackages);

use Spatie\SchemaOrg\Schema;

$localBusiness = Schema::localBusiness()
    ->name('Spatie')
    ->email('[email protected]')
    ->contactPoint(Schema::contactPoint()->areaServed('Worldwide'));

echo $localBusiness->toScript();