function exists

Copy CodeThe code is as follows: /** * Event exception * * @author Lonely * @create 2010-10-21 * @version 0.1 * @lastupdate Lonely * @package Event */ Class Exception_event extends Exception {} /** * Event Object * * @author Lonely * @create 2010-10

Custom functions　　PHP has more than 1000 functions built into it, so the function makes PHP a very powerful language. Most of the time we use the built-in functions of the system to meet the requirements, but the custom function is more clear about

First, reflectiondefinition: use a string to manipulate (Find/check/delete/set) members in objects (modules)#getattr: Get Properties in module#hasattr: Checks if a member (function) exists in the module#delattr: Remove members from a module#setattr:

The first contact with Nodejs's file system was stunned by its asynchronous response, and later found Nodejs to determine if the folder exists and create a folder is also a synchronous method, but still want to try to use asynchronous method to

Design of PHP Collection class Use. NET development has been for many years, recently contacted PHP, found that PHP is not fun. However, it is found that there are no collection classes, only arrays, and arrays are strong. Here I use an array to

SyntaxBool function_exists (string $ function_name)Check the list of defined functions. Both built-in and user-defined functions are function_name.Return valueReturns true. If function_name exists, it is a function. Otherwise, false is returned.*/If

[PHP] Tag mappings and unit of work Tag Mappings There may be two identical values in the system, but not the same referenced object, so that duplicate objects may be read from the database, which creates unnecessary queries. tag mapping is a

1, shell/cmd command line compression decompression (1) Zip compression decompressionzip compression : zip-rp{Password} //Overwrite existing file by defaultZip extract : zip-op{password} //Overwrite existing file by default(2) RAR compression

I. Basic data type 1. StringClass: StrMethod: Select str, hold command (CTRL) + Left button to jump to the corresponding methodThe usual methods of string are summarized as follows: 1) Capitalize Function: Implement the first letter of

"Basic data types and literacy in Python"One, the binary1. Introduction to the systemThe binary system is a kind of carry-out method which is stipulated by people. Data operations and storage at the bottom of the computer are binary data. Computer

Tag: Width bit identifies SDE SLA intersect end Kanji parameterI. Basic data type 1. StringClass: StrMethod: Select str, hold command (CTRL) + Left button to jump to the corresponding method Create A = "hexin" a = str (' hexin ')

Document directory 1. index.html 2. Script. js 3. styles.css 4. Write the node Program Node. js development manual (2) Author: chszs, reprinted with note. Blog homepage: http://blog.csdn.net/chszsI. static file service If we want to use files

Day11day11 1 1. Application of Function name (first object) 2 1.1. 1, the direct print function name gets the memory address of the function 2 1.2. 2, function name can be assigned a value Operation 2 1.3. 3, function name can be used as parameter

The history of computer language:Machine Language ----> Assembly Language ----> Advanced Language (1. for process 2. Object Oriented )any one C The program is composed of one or more program segments, each of which has its own energy, we generally

first, establishing a simple Web server involves some basic points of node. JS:1. Request ModuleIn node. JS, the system provides a number of useful modules (you can, of course, write your own modules in JavaScript, which we'll explain in detail

If you look at the code below, can you find out where the error is? Copy Code code as follows: echo function_exists (' addcslashes ');//detect if the function exists Echo GET_MAGIC_QUOTES_GPC (). ' '//detect whether to turn on

In the previous chapter, we introduced the Node.js Web service-oriented JavaScript server platform, while Node.js's operating environment has been set up, and through two HelloWorld programs to verify the basic functions of node.js. In this chapter

In this chapter, we also use Node. js creates a simple Web server. in the previous chapter, we introduced Node. js, a JavaScript Server Platform for Internet services, and Node. the js runtime environment has been set up and verified by two

A summary of some practical functions (frames) of packages in JS motionIn the previous period of time to learn the JS movement is a very useful function, should be called a small framework, and now summed up. Why not summarize it at that time? I

When you operate MSSQL in PHP, you must first check whether the system running environment is supported and run the following statements. [Php]If (function_exists ('mssql _ connect ')){Echo 'this function exists, indicating that the Environment