emojis and meanings

Why are multiple function parameters followed by half square brackets in the php manual? What are the meanings of these parentheses? I have always had this question. google and Baidu have no answer. I don't know if anyone can give me a answer. Thanks for the fact that many function parameters in the php manual are followed by half square brackets? What are the meanings of these parentheses? I have always h

This article aims to introduce Scala's less common symbolic meanings in other languages and to help understand Scala Code.As I learn more about Scala, I will continue to add the content of this blog post, which describes the symbols in Scala: ::: Three colon operator: A connection operation that represents a list Val one = list (All-in-one) Val-the-list (4,5,6) val three = One:::twoOutput result: Three:list[int] = List (1, 2, 3, 4, 5, 6)

I. apple-mobile-web-app-capable attributes and meanings in meta tagsThe META function is to delete the default Apple toolbar and menu bar.The content has two values "yes" and "no", and when we need to display the toolbar and menu bar, the row meta is not added, the default is display.Apple-mobile-web-app-status-bar-style attributes and meanings in meta tagsThe "Apple-mobile-web-app-status-bar-style" functio

program to the following form, using a pair of iterators that represent the range of elements to construct the VEC. Istream_iterator (ostream_iterator) an iterator that writes the output stream. (17) The random-access iterator (random-access iterator) supports the use of bidirectional iterators, plus the relational operators, subscript operators, and arithmetic operations on iterators that compare iterator values, thus supporting random access elements.(18) A reverse iterator (reverse iterator)

Article Title: common errors at the front-end of a Linux server and their meanings. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Common Errors on the Linux Server front-end and their meanings General class prompts Eth1: Too much work at interrupt, IntrStatus = 0x0001

article turn from: C + + Proverbs: Understanding the two meanings of TypeName Question: What is the difference between class and TypeName in the following template declarations (templates declaration)? templateclassclass// uses "class"class// Uses "TypeName"Answer: Nothing different. Class and TypeName mean exactly the same thing when you declare a template type parameter (the parameter for the templates). Some programmers prefer to

How does iOS obtain the unique identifier of a device? What are the meanings of IDFA, IDFV, and UDID ?, IdfaidfvHow does iOS obtain the unique identifier of a device? What are the meanings of IDFA, IDFV, and UDID? [Abstract: 1. UDID (Unique Device Identifier) UDID is called Unique Device Identifier, which is a Unique identification code of Apple IOS equipment, it consists of 40 characters of letters and war

Original article: http://chandlerzhao.blogchina.com/chandlerzhao/2759497.html Parameter meanings of embedded RealPlayer players Parameter meanings of embedded RealPlayer players Parameter: autostartAttribute: true or falsePurpose: Specify whether to automatically play the specified source file. Parameter: backgroundcolorAttribute: Any hexadecimal value starting with the symbol "#" or any prede

ObjectiveWhen learning to program, often see the word stack, its Chinese name is called "Stack".Understanding this concept is essential for understanding the operation of the program. It is easy to confuse that the word actually has three meanings, which apply to different occasions and must be differentiated.Meaning one: Data structureThe first meaning of a stack is the way a set of data is stored, characterized by LIFO, which is LIFO (last in, first

Covariance of meanings and formulasProbabilistic statistical studies children know that statistics in the most important concepts are sample averages, variances, or with standard deviations together. First of all, we will give you a sample containing n, narrative, these high school math children should know it, around the belt.Mean value:Standard deviation:Variance:It is clear that the mean description is the middle point of the sample set, which tell

The understanding of eigenvalues and eigenvectors has been somewhat confusing, and recently the PageRank algorithm happens to have encountered eigenvalues and eigenvectors, so we want to explore the geometric meanings of eigenvalues and eigenvectors.Matrix multiplication corresponds to a transformation, which transforms any vector into a new one that is mostly different in another direction or length. In the process of this transformation, the origina

Symbols like * and can be used as operators in expressions and as part of declarations. The symbol context determines the meaning of symbols. Int I = 42; Int R = I; // immediately following the type name, so it is part of the declaration and R is a reference Int * P; // * follows the type name, so it is part of the Declaration, and P is a pointer. P = I; // appears in the expression, which is an address operator. * P = I; // * is a quote in the expression. Int r2 = * P; // it a

Item M8: Understanding the various meanings of new and deletePeople sometimes seem to like to deliberately make the C + + language's terminology difficult to understand. For examplenew operator(new operator) andNew OperationThe difference between (operator new).for knowledge of the new operator and the new operation, refer to http://blog.csdn.net/qianqin_2014/article/details/51320775>When you write such a code:String *ps = new String ("Memory Manageme

I. format-detection attributes and meanings in meta tagsFormat-detection translated into Chinese means "format detection", as the name implies, it is used to detect some of the HTML format, the Format-detection property about meta is mainly the following settings: Meta name= " Format-detection "content=" telephone=no "meta name=" format-detection "content=" email=no "meta name=" format-detection "Content=" Adress=no "can also ligatures: Meta name=" fo

Spring-servlet.xml and Application.xml configuration locations and meanings in Web. XML2015-09-12 18:04 18451 People read comments (0) favorite reports Classification:Web. Xml(8) Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.When we carry out spring-servlet development, often encounter configuration file configuration problem, to solve this problem thoroughly, we need to understand the ba

How does iOS get a unique identifier for a device? What are the meanings of IDFA, IDFV and Udid respectively? [Abstract: 1, UDID (unique device Identifier) UDID is a unique device Identifier, words too literally, it is the only Apple iOS device identification code, it is composed of 40 characters of letter war numbers. A lot needs to be limited]First, UDID (Unique Device Identifier)The full name of Udid is unique device Identifier, which, as its name

When we look at some of the computer tutorials, we often see that the tutorial mentions that you can execute a program or open an operation by entering an English run command in the computer's running window. So, what do these English-speaking commands mean? Below, the small series to everyone to tidy up the commonly used computer running commands and their corresponding meanings, then together to understand it! Computer Run window Common compu

This article introduces four characteristics and meanings of database transactions. We can refer to Topic.alibabacloud.com's MySQL video tutorial and MySQL manual! Four characteristics and meanings of database transactions The database transaction transanction four basic elements that are correctly executed. ACID Atomicity (atomicity) Atomicity: All operations in the entire transaction, either compl

explicit sys.fn_physlocformatter format.Put the file number 1 in the front, the middle 73 is the page number, and the last 0 is the slot (Sloc number).The meanings of these fields are briefly explained below. Here the requirement for SQL Server storage is just a basic understanding, otherwise look at the foggy.1, first say what is the file numberFor example, the file number is the data file number of the database, there is only one data file, the fil

As a real-time monitoring of MongoDB's sharp weapon, Mongostat is definitely a razor, simple and easy to use, however, to carefully analyze the mongostat state, but also a deep understanding of the meaning of each monitoring item.#mongostatinsertqueryupdatedeletegetmorecommandflushes Mappedvsizeresfaultslocked%idx miss%qr|qwar|awnetInnetOut connsetrepltime*79 87*0*0 013|00 354g710g10.2g9 00 0|00|09k 666k483Nbsp;c56...sec15:07:17 The meanings of each i