An analysis of the reasons for the higher efficiency of the static member function of PHP _php tutorial

Many PHP developers know that the use of static member functions of the class is higher than the ordinary member functions of the class, this article from the application level analysis of the problem

Here's an example:

Copy the Code code as follows: header (' content-type:text/html; Charset=utf-8 ');
Class xclass{
public static $var 1 = ' 1111111111111111 ';
Public $var 2 = ' aaaaaaaaaaaaa ';
Public Function __construct ()
{
$this-var2 = ' bbbbbbbbbbbbbbbb ';
}
public static function Secho1 ()
{
echo Self:: $var 1. '

';
}
Public Function Secho2 ()
{
Echo $this-var2. ' ';
}
Public Function Secho3 ()
{
Echo ' CCCCCCCCCCCCCC ';
}
}
Xclass:: Secho1 ();
Xclass:: Secho3 ();
echo "------------------------------
";
$XC = new Xclass ();
$XC-Secho1 ();
$XC-Secho2 ();
?>
Looking carefully at the example above, you will find an interesting place where SECHO1 () is defined as a static method and can still be referred to as a dynamic method in a dynamic class's pair instance, while Secho3 () can also be treated as a static member function, from this level it is not difficult to understand why static member functions are faster than dynamic.

Perhaps because of compatibility,PHP class members do not have obvious static and dynamic points, all members are not explicitly stated in the case will be treated as static members in a specific memory area , so call the static member function and call the normal function, as fast.

But calling dynamic classes is different, it is to use this class structure as a sample, in memory to regenerate an object instance, so there is a process, which for the simple class, it may not be anything, but for the complex class it is obvious impact efficiency.

Some people will worry that the use of static methods will not cause memory consumption too much, in fact, from the above analysis can be known that you do not declare static methods, the system will still treat members as static, so for a completely static method of the class and a completely dynamic but not declare the instance object class memory is almost the same, Therefore, for the more direct logic, it is recommended to use static member method directly, of course, some complex or explicit logic, if completely static class is not impossible, but then lose the meaning of the class, if so, why oop, by use, static method is particularly suitable for the MVC pattern of logic class.

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