这只是卡斯顿代码的修改

function include_all_php($folder){
    foreach (glob("{$folder}/*.php") as $filename)
    {
        include $filename;
    }
}

include_all_php("my_classes");

<?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"); 
}

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)。

你可以使用set_include_path:

set_include_path('classes/');

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

如果文件之间没有依赖关系…下面是一个递归函数来包含所有子dirs中的include_once所有php文件:

$paths = array();

function include_recursive( $path, $debug=false){
  foreach( glob( "$path/*") as $filename){        
    if( strpos( $filename, '.php') !== FALSE){ 
       # php files:
       include_once $filename;
       if( $debug) echo "<!-- included: $filename -->\n";
    } else { # dirs
       $paths[] = $filename; 
    }
  }
  # Time to process the dirs:
  for( $i=count($paths)-1; $i>0; $i--){
    $path = $paths[$i];
    unset( $paths[$i]);
    include_recursive( $path);
  }
}

include_recursive( "tree_to_include");
# or... to view debug in page source:
include_recursive( "tree_to_include", 'debug');

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