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PHP basics Autoload_PHP tutorial
- WBOYOriginal
- 2016-07-13 10:37:191070browse
The autoload mechanism of PHP is very important. Here are 2 small exercises.
Original article, please indicate when reprinting: http://www.cnblogs.com/phpgcs
The file structure is as follows, 2 ways to achieve automatic loading
1, custom function
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
First look at the custom function method:
define('EOL', (PHP_SAPI == 'cli') ? PHP_EOL : '');
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();
$b = new bClass();
print_r(get_included_files());
?>
The running results are as follows:
+ View Code
The second way:
class myLoader{
public static function autoload($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'));
/**
The *__autoload method will become invalid after spl_autoload_register because the autoload_func function pointer already points to the spl_autoload method
* You can add the _autoload method to the autoload_functions list through the following method
*/
//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;
?>
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