PHP基础之Autoload
- WBOYOriginal
- 2016-06-21 08:48:321009browse
PHP的自动加载autoload机制很重要，这里做2个小练习
原创文章，转载请注明：http://www.cnblogs.com/phpgcs
文件结构如下，2种方式实现自动加载
1，自定义函数
2，spl_autoload_register()
liuyuan@ebuinfo:/var/www/phpgcs/php_autoload$ ll ./*
-rw-rw-r-- 1 liuyuan liuyuan 800 Feb 19 11:39 ./func_autoload.php
-rw-rw-r-- 1 liuyuan liuyuan 906 Feb 19 11:28 ./spl_autoload.php
./include:
total 16
drwxrwxr-x 2 liuyuan liuyuan 4096 Feb 19 11:42 ./
drwxrwxr-x 3 liuyuan liuyuan 4096 Feb 19 11:43 ../
-rw-rw-r-- 1 liuyuan liuyuan 142 Feb 19 11:42 aClass.php
-rw-rw-r-- 1 liuyuan liuyuan 143 Feb 19 11:42 bClass.php
首先看自定义函数方式：
define('EOL', (PHP_SAPI == 'cli') ? PHP_EOL : ' br>');
print_r(get_included_files());
echo EOL;
print get_include_path();
echo EOL;
//set_include_path(get_include_path().PATH_SEPARATOR.'/var/www/ly_php/php_spl/include/');
//set_include_path(dirname(__FILE__).'/include');
//set_include_path(dirname(__FILE__).'/include/');
function __autoload($className){
$filename = './include/'.$className.'.php';
//$filename = './include/'.$className.'.php';
//$filename = '/var/www/ly_php/php_spl/include/'.$className.'.php';
if(file_exists($filename)){
include_once $filename;
}else{
exit('no file');
}
}
$a = new aClass();
$b = new bClass();
print_r(get_included_files());
?>
运行结果如下：
+ View Code
第二种方式：
class myLoader{
public static function autoload($className){
$filename = './include/'.$className.'.php';
if(file_exists($filename)){
include_once $filename;
}else{
exit('no file');
}
}
}
define('EOL', (PHP_SAPI == 'cli') ? PHP_EOL : '
');
spl_autoload_register(array('myLoader', 'autoload'));
/**
*__autoload 方法在 spl_autoload_register 后会失效，因为 autoload_func 函数指针已指向 spl_autoload 方法
* 可以通过下面的方法来把 _autoload 方法加入 autoload_functions list
*/
//spl_autoload_register( '__autoload' );
error_reporting(E_ALL^E_NOTICE^E_WARNING^E_ERROR);
error_reporting(E_NOTICE E_WARNING );
$a = new aClass();
print_r(get_included_files());
echo EOL;
$b = new bClass();
echo EOL;
?>