Three commonly used functions in the PHP SPL standard library
Jun 11, 2018 am 09:48 AM
This article mainly introduces the commonly used functions in the PHP SPL standard library. This article focuses on the three functions of spl_autoload_extensions(), spl_autoload_register(), and spl_autoload(). Friends in need can refer to it
The PHP SPL standard library provides some functions for processing such as automatic loading, iterator processing, etc.
spl_autoload_extensions() adds file extensions that can be loaded by spl_autoload()
spl_autoload_register() registers the function into the SPL __autoload function stack.
The code is as follows:
/*test1.php*/
<?php
class Test1
{
}
/*test2.lib.php*/
<?php
class Test2
{
}
/*test.php*/
<?php
//設(shè)置可加載類的文件擴(kuò)展名
spl_autoload_extensions(".php,.inc.php,.class.php,.lib.php");
//設(shè)置include_path,autoload會(huì)在這些path中去尋找類文件,可通過(guò)PATH_SEPARATOR添加多個(gè)path
set_include_path(get_include_path().PATH_SEPARATOR.'libs/');
//不提供參數(shù)，默認(rèn)實(shí)現(xiàn)函數(shù)是spl_autoload()
spl_autoload_register();
$test1 = new Test1();
$test2 = new Test2();
spl_autoload()它是__autoload()的默認(rèn)實(shí)現(xiàn)，它會(huì)去include_path中加載文件(.php/.inc)The code is as follows:
/*test1.php*/
<?php
class Test1
{
}
/*test.php*/
<?php
set_include_path(get_include_path().PATH_SEPARATOR.'libs/');
spl_autoload('test1');
$test1 = new Test1();
spl_autoload_call()調(diào)用所有spl_autoload_register注冊(cè)函數(shù)來(lái)加載文件The code is as follows:
/*test1.php*/
<?php
class Test
{
public function getFilename()
{
echo 'test1.php';
}
}
/*test2.lib.php*/
<?php
class Test
{
public function getFilename()
{
echo 'test2.lib.php';
}
}
/*test.php*/
<?php
function loader($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.phpOther SPL function introduction:
class_implements — Returns the specified class All interfaces implemented.
class_parents — Returns the parents of the specified class.
class_uses — Return the traits used by the given class
iterator_apply — Call a user-defined function for each element in the iterator
iterator_count — Count the number of elements in the iterator
iterator_to_array — Will The elements in the iterator are copied to the array
spl_autoload_functions — Returns all registered __autoload() functions
spl_autoload_unregister — Unregisters registered __autoload() functions
spl_classes — Returns all available SPL classes
spl_object_hash — Returns the hash id of the specified object
If iterator related functions are used:
The code is as follows:
$iterator = new ArrayIterator (array( 'recipe' => 'pancakes' , 'egg' , 'milk' , 'flour' ));
print_r(iterator_to_array($iterator)); //將迭代器元素轉(zhuǎn)化為數(shù)組
echo iterator_count($iterator); //計(jì)算迭代器元素的個(gè)數(shù)
print_r(iterator_apply($iterator, 'print_item', array($iterator)));//為迭代器每個(gè)元素調(diào)用自定義函數(shù)
function print_item(Iterator $iterator)
{
echo strtoupper ( $iterator -> current ()) . "\n" ;
return TRUE ;
}Summary: The above is this article The entire content, I hope it will be helpful to everyone's study.
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