Introduction to common functions in PHP SPL standard library _php Tutorial

Introduction to common functions in PHP SPL standard library

This article mainly introduces the common functions introduced in PHP SPL standard library, this article emphatically explains the Spl_autoload_extensions (), Spl_autoload_register (), Spl_autoload () three functions, A friend you need can refer to the following

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

Spl_autoload_extensions () add spl_autoload () to load the file name extension

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

Copy the 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");

Setting Include_path,autoload to find the class file in these paths, you can add multiple paths through Path_separator

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

Parameter not supplied, 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 (), it will go to include_path load file (. php/.inc)

Copy the 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 the file

Copy the 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 are described:

class_implements-returns all 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-calls a user-defined function for each element in the iterator

iterator_count-calculating the number of elements in an iterator

iterator_to_array-copying elements from an iterator to an array

spl_autoload_functions-returns all registered __autoload () functions

spl_autoload_unregister-Unregister a registered __autoload () function

spl_classes-return all available SPL classes

spl_object_hash-returns the hash ID of the specified object

such as the iterator correlation function uses:

Copy the code code as follows:

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

Print_r (Iterator_to_array ($iterator)); Convert 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)));//Invoking a custom function for each element of an iterator

function Print_item (Iterator $iterator)

{

Echo Strtoupper ($iterator, current ()). "\ n";

return TRUE;

}

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