Example analysis of PHP dynamically generating objects based on string class names

in our last lesson PHP security String development ideas and code sharing, we introduced the PHP security string development Use, today we will continue to introduce about PHP string dynamically generated objects, often the need is, from other places to get a name of a class, You need to generate the object for the class, the syntax you used earlier ($obj = new $classname ();) It's definitely not working! Today we will show you how to achieve ~

First download the PHP class library for dynamically generating objects based on the string class name, which we need for this lesson: http://www.php.cn/xiazai/leiku/606

After the download is complete, locate the PHP class library file, unzip it to the local directory, and create a new file ~

We call this class in the new PHP file, and instantiate:

<?phpinclude_once "stringtext.php"; Introduction of Class library file $classname = ' Test ';          $obj = Call_user_func (Array ($className, ' create '); Var_dump ($obj);? >

The direct use of such a grammar is certainly not feasible:

$classname = ' Test '; $obj = new $classname ();

You can define a static method for the target class to generate an instance of the object, and then call the method through Call_user_func or Call_user_func_array. Of course, it can also be implemented by means of factory classes.

So the results of the operation are as follows: