Custom autoload without composer

<?php
//custom autoload without composer
$to_map = [
    'App\\' =>  'app/',
    'Core\\' => 'Core/',
];

foreach($to_map as $prefix => $base_dir)
{
    spl_autoload_register(function ($class) use ($prefix, $base_dir) {

        $base_dir = __DIR__ . "/{$base_dir}";

        $len = strlen($prefix);
        if (strncmp($prefix, $class, $len) !== 0)
        {
            return;
        }

        $relative_class = substr($class, $len);

        $file = $base_dir . str_replace('\\', '/', $relative_class) . '.php';

        if (file_exists($file))
        {
            require $file;
        }
    });
}

Composer autoload

require __DIR__ . '/vendor/autoload.php';

$log = new Monolog\Logger('name');
$log->pushHandler(new Monolog\Handler\StreamHandler('app.log', Monolog\Logger::WARNING));
$log->addWarning('Foo');

Source: getcomposer.org

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