Introduction to common functions in the standard library of PHP SPL

This article mainly introduced the PHP SPL standard library in the common function introduction, this article emphatically explained Spl_autoload_extensions (), Spl_autoload_register (), Spl_autoload () three functions, Need friends can refer to the following

The PHP SPL standard library provides functions for processing such as automatic loading, iterator processing, and so on.

Spl_autoload_extensions () Add spl_autoload () the file name extension that can be loaded

Spl_autoload_register () registers the function into the SPL __autoload function stack.

Copy code code as follows:

/*test1.php*/

　　

Class Test1

{

}

/*test2.lib.php*/

　　

Class Test2

{

}

/*test.php*/

　　

To set the file name extension of a loadable class

Spl_autoload_extensions (". php,.inc.php,.class.php,.lib.php");

Setup Include_path,autoload will look for class files in these path, and you can add multiple path through Path_separator

Set_include_path (Get_include_path (). Path_separator. ' libs/');

No arguments are supplied, the default implementation function is Spl_autoload ()

Spl_autoload_register ();

$test 1 = new Test1 ();

$test 2 = new Test2 ();

Spl_autoload () It is the default implementation of __autoload () that will go to include_path to load the file (. php/.inc)

Copy code code as follows:

/*test1.php*/

　　

Class Test1

{

}

/*test.php*/

　　

Set_include_path (Get_include_path (). Path_separator. ' libs/');

Spl_autoload (' test1 ');

$test 1 = new Test1 ();

Spl_autoload_call () calls all Spl_autoload_register registration functions to load files

Copy code code as follows:

/*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

Other SPL Functions Introduction:

class_implements-returns all the interfaces implemented by the specified class.

class_parents-returns the parent class of the specified class.

Class_uses-return the traits used by the given class

iterator_apply-invokes a user-defined function for each element in the iterator

iterator_count-calculate the number of elements in an iterator

iterator_to_array-copy elements from an iterator to an array

spl_autoload_functions-returns all registered __autoload () functions

spl_autoload_unregister-logout of the registered __autoload () function

spl_classes-returns all available SPL classes

spl_object_hash-returns the hash ID of the specified object

such as iterator related functions use:

Copy code code as follows:

$iterator = new Arrayiterator (Array (' recipe ' => ' pancakes ', ' egg ', ' milk ', ' flour '));

Print_r (Iterator_to_array ($iterator)); Converting an iterator element to an array

echo Iterator_count ($iterator); Count the number of iterator elements

Print_r (iterator_apply ($iterator, ' Print_item ', Array ($iterator));//Call a custom function for the iterator for each element

function Print_item (iterator $iterator)

{

Echo strtoupper ($iterator-> Current ()). "N";

return TRUE;

}