__autoload() 在 PHP 中似乎没有做任何事情
我正在运行最新版本的 XAMPP，而 autoload() 似乎没有正常工作。我几乎用 PHP 手册中的自动加载替换了以前的自动加载，但没有效果。
在放置了一些 echo 和 die() 后，我得出的结论是 __autoload 根本没有被调用。
class Main
{
var $config_data;
function __autoload($class_name) {
echo "hello.";
// If the file exists, require it
if (file_exists(SYSTEMDIR.$class_name.".".EXT)) {
echo 'Autoloader: The class exists.';
(require_once(SYSTEMDIR.$class_name.".".EXT))
or die("I tried to autoload class $class_name, but it failed! =(");
} else {
// The file didn't even exist. Die.
die("I was going to autoload class $class_name, but it didn't exist! =(");
}
}
/*
* Function __construct
* @param datatype variable description
* @return datatype description
*/
function __construct(/* $arg */) {
//Load the config
$this->config = new Config;
//Load the uri class:
$this->uri = new Uri;
}
}
它不会输出位于 __autoload() 最顶部的“hello”。
唯一的输出是：
致命错误：未找到类“Config” 在 E:\xampplite\htdocs\system\Main.php 在第 84 行
I'm running the latest version of XAMPP and autoload() doesn't seem to be working as it should. I pretty much replaced my previous autoload with the one from the PHP manual, but to no avail.
After putting a few echo's and die()s, I've concluded that __autoload isn't being invoked at all.
class Main
{
var $config_data;
function __autoload($class_name) {
echo "hello.";
// If the file exists, require it
if (file_exists(SYSTEMDIR.$class_name.".".EXT)) {
echo 'Autoloader: The class exists.';
(require_once(SYSTEMDIR.$class_name.".".EXT))
or die("I tried to autoload class $class_name, but it failed! =(");
} else {
// The file didn't even exist. Die.
die("I was going to autoload class $class_name, but it didn't exist! =(");
}
}
/*
* Function __construct
* @param datatype variable description
* @return datatype description
*/
function __construct(/* $arg */) {
//Load the config
$this->config = new Config;
//Load the uri class:
$this->uri = new Uri;
}
}
It doesn't output the "hello" that is located at the very top of __autoload().
The only output is:
Fatal error: Class 'Config' not found
in E:\xampplite\htdocs\system\Main.php
on line 84
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AFAIK 函数
__autoload必须在类外部定义。如果您想将自动加载功能实现为类的一部分，您应该使用回调和 spl_autoload_registerAFAIK function
__autoloadmust be defined outside the class. If you want to implement autoload function as part of a class, you should use callback and spl_autoload_register那是因为您声明了
Main->__autoload()函数（即类方法）而不是全局__autoload()That's because you declared a
Main->__autoload()function (i.e. a class method) not a global__autoload()__autoload不会进入类中。它用于包含类所在的文件。您需要向初始脚本添加一个自动加载函数才能让它执行任何操作。
__autoloaddoesn't go in the class. It's used to include the file the class is in.You'll need to add an autoload function to the initial script to ever have it do anything.