Example of php auto-loading mechanism

This article mainly introduces the php autoload mechanism example, the file structure is as follows, two ways to achieve automatic loading, friends can refer to the next 1, user-defined functions

2, spl_autoload_register ()

The code is as follows:
Liuyuan @ ebuinfo:/var/www/phpgcs/php_autoload $ ll ./*
-Rw-r -- 1 liuyuan 800 Feb 19 :39./func_autoload.php
-Rw-r -- 1 liuyuan 906 Feb 19 :28./spl_autoload.php

./Include:
Total 16
Drwxrwxr-x 2 liuyuan 4096 Feb 19 11: 42 ./
Drwxrwxr-x 3 liuyuan 4096 Feb 19 11: 43 ../
-Rw-r -- 1 liuyuan 142 Feb 19 :42 aClass. php
-Rw-r -- 1 liuyuan 143 Feb 19 :42 bClass. php

First, let's look at the custom function method:

The code is as follows:
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 result is as follows:

The code is as follows:
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/pear
AClass is loaded
BClass is loaded
Array
(
[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
)

Method 2:

The code is as follows:
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 ('myload', 'autoload '));

/**
* The _ autoload method will expire after spl_autoload_register, because the autoload_func function pointer has pointed to the spl_autoload method
* You can add the _ autoload method to the autoload_functions list using 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;
?>

The running result is as follows:

The code is as follows:
Liuyuan @ ebuinfo:/var/www/phpgcs/php_autoload $ php spl_autoload.php
AClass is loaded
Array
(
[0] =>/var/www/phpgcs/php_autoload/spl_autoload.php
[1] =>/var/www/phpgcs/php_autoload/include/aClass. php
)

BClass is loaded