what constant function

The Usleep () function delays code execution for several microseconds. The unpack () function unpack the data from a binary string. The Uniqid () function generates a unique ID based on the current time in microseconds. The Time_sleep_until ()

PHP4 User Manual: constant. Variable # language. constants. syntax fixed constant a constant is a simple value chapter 8th. constant Directory List website construction server script class \ phpphp user manual fancy1_age.constants.html # language.

This article mainly introduces php constants, the syntax analysis of constants, the differences between constants and variables, and what are pre-defined constants. I. constants ConstantIs a simple value identifier (name ). As its name implies,

File loading --- understanding the first step of a project, --- project. File loading --- understanding the first step of a project --- when I first wrote php, I always worried about this problem: can I load a new class to a corresponding class file

PHP has been updated to many versions, and PHP5 has been used more recently. Next, we will summarize common PHP5 functions for you to view in your actual code. Explanation of PHP pop-up dialog box skills in-depth explanation of PHP statistical

In php5, const, define, and static 1. in const programming, we generally use constants to define the constant values that cannot be changed during runtime. let's take a look at const in php, there is nothing to say about this, just to improve the

One of the most important causes of program crash is to reference the NULL pointer in the graphic. As mentioned in the previous articles, intelligent pointers refcountptr and scopedptr provide runtime diagnostics. However, not all pointers have all

The static keyword has at least N functions: (1) The static variable in the function body applies to this function body. Unlike the auto variable, the memory of this variable is allocated only once, therefore, the value remains the value of the

Note: Some of the following content references the Internet and cannot find the source. However, I have carefully read it. If you find any error or deficiency, please correct or supplement it. Thank you!  Question 1: Give the if statement for

Question 1: Compile arpd. cArpd. C: In function 'arpd _ send ':Arpd. C: 269: Error: Expected ') 'Before String constantArpd. C: In function 'arpd _ lookup ':Arpd. C: 286: Error: Expected ') 'Before String constantArpd. C: 295: Error: Expected ')

1. Basic knowledge of functions C ++ has certain restrictions on the type of returned values: it cannot be an array, but it can make any other type, or even make the structure and object. Interestingly, although arrays cannot be returned as return

Question 5: Write a function to shift n loops of a char string to the right. For example, if "abcdefghi" is n = 2, it should be "hiabcdefgh" after the shift" The function header is as follows:// Pstr is a pointer to a string ending with '\ 0' //

Some concepts in C ++ and their differences (need to be deeply understood ): (1) local variable global variable static variable const constant register variable macro defined constant static variable (Note: including their memory allocation, scope,

Reprinted from: http://blog.csdn.net/zckloveczy/archive/2009/06/03/4240189.aspx Thanks to the original author. The GL library in OpenGL is the core library, the Glu is the practical library, the glut is the practical tool library, the GL is the

From: http://hi.baidu.com/litomboy/blog/item/08dade95a32c3148d0135e38. Html Other http://www.zeliu.com/digg_view.asp? Id = 112 Question 1: Write a function to shift n loops of a char string to the right. For example, if "abcdefghi" is n = 2, it

Getting started with Swift Functions 1. Functions in swift are of the upper type, so functions can also be used as parameters and returned results. 2. Define the form keyword name (parameter list)-> return value type. The following is an example of

/* + ------------------------------------------------------------------------------- + | = Read this article for Haohappy | = Notes in the Classes and Objects chapter | = Translation-oriented + personal experiences | = Do not repost it to avoid

IOS network programming-Day3 (C language supplement)1. constant classification (1) integer constants are only in decimal notation. Positive and negative integers. % d. Decimal placeholders. Integer constants are printed in decimal notation. % o

1. Const In programming, we generally use constants to define the constant values that cannot be changed during runtime. Let's take a look at the const in PHP. There is nothing to say about this, let's just talk about it for the sake of Knowledge

PHP super global variable array (Super Global Array), also known as PHP pre-defined array, is built in by the PHP engine and does not need to be redefined by developers. When the PHP script runs, PHP automatically puts some data in the super global