PHP automatic loading autoload mechanism example sharing

PHP automatic loading autoload mechanism example sharing_PHP tutorial

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Release： 2016-07-13 10:24:54

Original

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1, custom function

2, spl_autoload_register()

Copy code The code is as follows:

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:

Copy code 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 = ' 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:

Copy code 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
)

The second way:

Copy code 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('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
by 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;
?>

运行结果如下：

复制代码代码如下:

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