class constant

In php, if we want to define constants, there are many methods, but in the class we want to define constants, most of them will use the const constant modifier to define them, the following small series will introduce the operation methods to

17th reflection and class loader 17.1 using reflectionReflection: The. Class document reflects the basic information of the class, and the way the class information is obtained from APIs such as class is called reflection.17.1.1 class and. Class

Read the PHP version for PHP-7.1.0 RC3, read the code platform for LinuxIn fact, starting with this function, we have entered the range of the Zend engine.zend_eval_string_ex(exec_direct, NULL, "Command line code", 1)is actually called

/* "Array function" *///statistical calculationCount counts the number of cells in an array or the number of properties in an objectArray_count_values the number of occurrences of all values in the statistics arrayArray_product computes the product

Nullable types are primarily used for parameter type declarations and function return value declarations.The two main forms are as follows:function Answer ():? int {return null; Ok}function Answer ():? int {Return 42; Ok}Function say (? string $msg)

The implementation of the PHP object:Note: object names are best named by the object name. class.php.1. For members of static classes that cannot use $this-> to invoke members and functions of their static classes, they should be invoked using self::

Mr. Mak introduction: In Learning PHP object-oriented programming ideas, we will encounter a lot of automatic call magic method, each magic method has its own specific triggering scenario, but its fundamental purpose is to write and actual use of

In the process of Java method Invocation, how does the JVM know which class to call the method source code? What's the inside of this? In this article we will expose the static (static binding) and dynamic binding mechanisms (auto binding) of JVM

If you are idle, you can just find some PHP information about OO. The access control modifier, self, parent, const, and static keywords, and the arrow operator (this is also called in the book .. "->"), range resolution operator (double colon ":"),

PHP autoload mechanism details(1) autoload mechanism OverviewWhen using the php oo mode to develop a system, we usually get used to storing the implementation of each class in a separate file, which makes it easy to reuse classes, at the same time,

First, the extraction class (abstract)In our actual development process, some classes do not need to be instantiated, such as some of the previous learning of the parent class, mainly for the subclass to inherit, so as to improve code

Describes classes and objects (inheritance) in php and php Introduction In php, The extends keyword is used for inheritance of types, and only one parent class can be inherited. php does not support multi-inheritance. class MyClass { public $dat =

JavaSE review diary: interface, javase review diary Interface /** Interface * Reference Data Type: * class, interface, array; ** interface is a reference data type, which can be considered as a special class, it is designed to solve the problem of

Android offline download knowledge, android offline The offline download function is as follows:1. Download Management (START and cancel download ).2. Network judgment (wi-fi, 3G ).3. Independent process.4. timed and mobile phone reminders.5.

A jvm parameter with better performance Jvm parameter configuration for a good web server: -Server // server mode-Xmx2g // The maximum heap memory that can be allocated by JVM, which can be allocated on demand.-Xms2g // The initial heap memory

first, file format1. For files that contain only PHP code, we will ignore "?>" at the end of the File. This is to prevent extraneous spaces or other characters from affecting the Code.For example:$foo = ' Foo ';2. Indentation should be able to

PHP constantsThe define () function is used to define constants. Once a constant is defined, it cannot be changed or undefined.Example of defining constants: The code is as follows:Copy code Define ("CONSTANT", "Hello! ");Echo CONSTANT;?>

Basic syntax PHP tags, separators, annotations When parsing a file, PHP looks for the start and end tags, that is , to separate the PHP code from the HTML; Instruction delimiter: Like C or Perl, PHP needs to end the instruction with a

article 01: treat C + + as a language federalto better understand C + +, we decompose C + + into four major sub-languages: C in the final analysis C + + is still based on C. chunks, statements, pre-processor, built-in data types, arrays,

Subclasses use parent class variables Class A { var $authKey = ' 1111 '; } Class B extends a{ __construct () { Echo Parent::authkey; } } Error undefined class constant ' AuthKey ' ------Solution-------------------- The error message means a