PHP basics Autoload_PHP tutorial-PHP Tutorial-php.cn

PHP basics Autoload_PHP tutorial

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Release： 2016-07-13 10:37:19

Original

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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;

Related labels：

php Base

source：php.cn

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