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()
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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 16drwxrwxr-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：
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<?php 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();
$b
= new bClass();
print_r(get_included_files());
?> |
运行结果如下：
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liuyuan@ebuinfo:/var/www/phpgcs/php_autoload$ php func_autoload.php
Array( [0] => /var/www/phpgcs/php_autoload/func_autoload.php
).:/usr/share/php:/usr/share/pearaClass is loadedbClass is loadedArray( [0] => /var/www/phpgcs/php_autoload/func_autoload.php
[1] => /var/www/phpgcs/php_autoload/include/aClass.php
[2] => /var/www/phpgcs/php_autoload/include/bClass.php
) |
原创文章，转载请注明：http://www.cnblogs.com/phpgcs
第二种方式：
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<?php 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 : ‘<br />‘);
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;
$b
= new bClass();
echo EOL;
?> |
运行结果如下：
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liuyuan@ebuinfo:/var/www/phpgcs/php_autoload$ php spl_autoload.php
aClass is loadedArray( [0] => /var/www/phpgcs/php_autoload/spl_autoload.php
[1] => /var/www/phpgcs/php_autoload/include/aClass.php
)bClass is loaded |
扩展阅读：