and define

Simple problem: php uses regular expressions to filter the format specified in the string and defines it as an array format: [English letters, numbers, {numbers}] for example: $ str = "this is a [pic, {0}] image, which is a description of [desc, {2}]

Transferred from: http://www.cnblogs.com/kerwinshaw/archive/2009/02/02/1382428.htmlI. Usage of typedefA typedef is commonly used to define an identifier and an alias for a keyword in the C + + language, which is part of the language compilation

1. const is used for defining class member variables. once defined, the value cannot be changed. Define defines global constants that can be accessed anywhere. 2. define cannot be defined in the class, but const can. 3. const cannot define the

I. Usage of typedef In C/C ++, typedef is often used to define an alias for an identifier and a keyword. It is part of the language compilation process, but it does not actually allocate memory space, such: Typedef int;Typedef int array

  In C/C ++, we usually use typedef keywords and # define macro-defined commands to write programs. In some cases, using them will achieve the same effect, however, there are substantial differences. One is the keywords of C/C ++ and the other is

Define section:Macros can be used instead of constant values, and can be used instead of expressions, even code snippets. (Macros are powerful, but error-prone, so their pros and cons are quite controversial.) ）The syntax for a macro is:Macro value #

#define是C的指令, used to define aliases for various data types, similar to TypeDef, but with a few different1,typedef is limited to defining a symbol name for a type, and # define can define not only the symbol name for the type, but also the alias for

1. Const is used for class member variable definition, once defined and cannot change its value. Define defines global constants that can be accessed everywhere.2. Define cannot be defined in a class and const can.3. Const cannot define constants in

From: Http://stackoverflow.com/questions/2447791/define-vs-constSame point: Both can define constantsConst foo = ' Bar ';d efind (' foo ', ' Bar ');The disadvantage of const:1.const must be declared in Top-level-scope (top-level domain):For example:

The first type: Object impersonationfunction ClassA (scolor) { this.color = Scolor; This.saycolor = function () { alert (this.color); };} function ClassB (Scolor, sName) { this.newmethod = ClassA; This.newmethod (Scolor);

Parse the differences between static, const, and define in php. Define: macros can be used not only to replace constant values, but also to replace expressions or even code segments. (Macros have powerful functions but are prone to errors, so their

TypedefIt is a type-defined keyword that is used to declare Custom Data Types in computer programming languages and used with various original data types to simplify programming. #DefineIs a preprocessing command. Let's take a look. Typedef is a C

Today in C language practice involves the use of TypeDef and define problems, then what is the difference between them? Why use typedef in this case? In which case, why use define?Did you ever think about it when you were studying C?Today I decided

In php, Constant and Define are constants. So I will introduce a method that can dynamically use the Constant and Define value methods. I hope this will be helpful to you. How should I use PHP to show or use dynamic Constant/Define values? Ex: The

1. const is used for defining class member variables. Once defined, the value cannot be changed. Define defines global constants that can be accessed anywhere.2. define cannot be defined in the class, But const can.3. const cannot define constants

Difference between const and define in php If (...){ Const FOO = 'bar'; // invalid } But If (...){ Define ('foo', 'bar'); // valid } 4. const uses a normal constant name, and define can

In C or C + +, you can declare a new type in place of an existing type by using typedef and define. For example:typedef int COUNT;#define COUNT int;Both work by using count to represent an int. Although the two functions are the same, there is

1. Brief example of enum enum useWhen writing a program, we often need to associate an optional set of alternative properties for an object. For example, the students ' grades a,b,c,d and so on, the weather is sunny, cloudy, rainy and so on.More

In the C + + language, namespace is the definition namespace, or definition scope, in C + + the most common scope is the use of {}, while C + + has define keyword, used to define a macro, or a preprocessing variable, So how is this preprocessing

The difference between parameter (parameter) and define (macro definition) in Verilog Statement format Parameter xx=yy; (with semicolons)' Define XX yy (no semicolon) Function range The parameter is