这篇文章主要介绍了php自动加载autoload机制示例,文件结构如下,2种方式实现自动加载,需要的朋友可以参考下
1,自定义函数
2,spl_autoload_register()
代码如下:
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
首先看自定义函数方式:
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代码如下:
<?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();
    $b = new bClass();
    print_r(get_included_files());
?>运行结果如下:
代码如下:
liuyuan@ebuinfo:/var/www/phpgcs/php_autoload$ 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
)第二种方式:
代码如下:
<?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;
    $b = new bClass();
    echo EOL;
?>运行结果如下:
代码如下:
liuyuan@ebuinfo:/var/www/phpgcs/php_autoload$ 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以上就是php自定义函数自动加载autoload机制实例详解的详细内容,更多请关注php中文网其它相关文章!
                        
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