<?php
//Loading all php files into of functions/ folder 

$folder =   "./functions/"; 
$files = glob($folder."*.php"); // return array files

 foreach($files as $phpFile){   
     require_once("$phpFile"); 
}

如果你想包含一堆类，而不必一次定义每个类，你可以使用:

$directories = array(
            'system/',
            'system/db/',
            'system/common/'
);
foreach ($directories as $directory) {
    foreach(glob($directory . "*.php") as $class) {
        include_once $class;
    }
}

这样你就可以在包含这个类的php文件中定义这个类，而不是整个$thisclass = new thisclass();

至于它处理所有文件的效果如何?我不确定这可能会有轻微的速度下降。

我建议您使用readdir()函数，然后循环并包含文件(请参阅该页上的第一个示例)。

2017年如何做到这一点:

spl_autoload_register( function ($class_name) {
    $CLASSES_DIR = __DIR__ . DIRECTORY_SEPARATOR . 'classes' . DIRECTORY_SEPARATOR;  // or whatever your directory is
    $file = $CLASSES_DIR . $class_name . '.php';
    if( file_exists( $file ) ) include $file;  // only include if file exists, otherwise we might enter some conflicts with other pieces of code which are also using the spl_autoload_register function
} );

这里由PHP文档推荐:自动加载类

<?php
//Loading all php files into of functions/ folder 

$folder =   "./functions/"; 
$files = glob($folder."*.php"); // return array files

 foreach($files as $phpFile){   
     require_once("$phpFile"); 
}

你可以使用set_include_path:

set_include_path('classes/');

http://php.net/manual/en/function.set-include-path.php