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PHP SPL标准库中的常用函数介绍,phpspl
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PHP SPL标准库中的常用函数介绍,phpspl

Jun 13, 2016 am 09:05 AM
php spl function standard library

PHP SPL标准库中的常用函数介绍,phpspl

PHP SPL标准库中提供了一些函数用来处理如自动加载、迭代器处理等。

spl_autoload_extensions()添加spl_autoload()可加载的文件扩展名
spl_autoload_register()注册函数到SPL __autoload函数栈中。

复制代码 代码如下:
/*test1.php*/
class Test1
{
}
 
/*test2.lib.php*/
class Test2
{
}
 
/*test.php*/
//设置可加载类的文件扩展名
spl_autoload_extensions(".php,.inc.php,.class.php,.lib.php");
//设置include_path,autoload会在这些path中去寻找类文件,可通过PATH_SEPARATOR添加多个path
set_include_path(get_include_path().PATH_SEPARATOR.'libs/');
//不提供参数,默认实现函数是spl_autoload()
spl_autoload_register();
 
$test1 = new Test1();
$test2 = new Test2();

spl_autoload()它是__autoload()的默认实现,它会去include_path中加载文件(.php/.inc)

复制代码 代码如下:
/*test1.php*/
class Test1
{
}
 
/*test.php*/
set_include_path(get_include_path().PATH_SEPARATOR.'libs/');
spl_autoload('test1');
$test1 = new Test1();

spl_autoload_call()调用所有spl_autoload_register注册函数来加载文件

复制代码 代码如下:
/*test1.php*/
class Test
{
    public function getFilename()
    {
        echo 'test1.php';
    }
}
 
/*test2.lib.php*/
class Test
{
    public function getFilename()
    {
        echo 'test2.lib.php';
    }
}
 
/*test.php*/
 
function loader($classname)
{
    if($classname == 'Test1') {
        require __DIR__ . '/test1.php';
    }
    if($classname == 'Test2') {
        require __DIR__ . '/test2.lib.php';
    }
}
 
spl_autoload_register('loader');
spl_autoload_call('Test2');
 
 
$test = new Test();
$test->getFilename(); //test2.lib.php

其它SPL 函数介绍:
class_implements — 返回指定的类实现的所有接口。
class_parents — 返回指定类的父类。
class_uses — Return the traits used by the given class
iterator_apply — 为迭代器中每个元素调用一个用户自定义函数
iterator_count — 计算迭代器中元素的个数
iterator_to_array — 将迭代器中的元素拷贝到数组
spl_autoload_functions — 返回所有已注册的__autoload()函数
spl_autoload_unregister — 注销已注册的__autoload()函数
spl_classes — 返回所有可用的SPL类
spl_object_hash — 返回指定对象的hash id

如iterator相关函数使用:
复制代码 代码如下:
$iterator  = new  ArrayIterator (array( 'recipe' => 'pancakes' ,  'egg' ,  'milk' ,  'flour' ));
 
print_r(iterator_to_array($iterator)); //将迭代器元素转化为数组
echo iterator_count($iterator); //计算迭代器元素的个数
print_r(iterator_apply($iterator, 'print_item', array($iterator)));//为迭代器每个元素调用自定义函数
 
 
function print_item(Iterator $iterator)
{
    echo  strtoupper ( $iterator -> current ()) .  "\n" ;
    return  TRUE ;
}

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