php5.3 Note Notes

php5.3
New features
1. Support Namespaces (namespace)
5.3 ago

Copy Code code as follows:


<?php


class Zend_db_table_select {


//Indicates that the current class file is located under Zend/db/table


}

5.3

Copy Code code as follows:


<?php


namespace Zend/db/table


class Select {


}

2. Support for deferred static binding
before 5.3 (__class__ get class name) self::who ()

Copy Code code as follows:


<?php


class A {


public static function, who () {


Echo __class__;


}


public static function test () {


self::who ();


}


}


class B extends A {


public static function, who () {


Echo __class__;


}


}


b::test ();


?>

Output A
5.3 (__class__ obtained class name) static::who ();

Copy Code code as follows:


<?php


class A {


public static function, who () {


Echo __class__;


}


public static function test () {


static::who (); This implements the deferred static binding


}


}


class B extends A {


public static function, who () {


Echo __class__;


}


}


b::test ();


?>

Output B

3. Support Goto Statement
in most computer programming languages, an unconditional turn statement Goto is supported, and when the program executes to a goto statement, it moves on to the program location indicated by the label in the Goto statement.

4. Support Closure

Copy Code code as follows:


<?php


$msg = "Hello";


$callback = function () use ($msg) {


Print_r ($msg);


}


$msg = "Hello world!";


callback ($callback);

output
Hello
Hello world!

5. New Magic Method __callstatic ()
There is a magic method __call () in PHP that is invoked automatically when the code calls a nonexistent method of the object.
The new __callstatic () method is used only for static class methods. When trying to invoke a static method that does not exist in a class, the __callstatic () Magic method is invoked automatically.

6. Add a new constant definition method (sometimes the code goes wrong, like undefined he, you want to see if it supports const)

Copy Code code as follows:

<?php
Const CONSTANT = ' Hello world ';