empty function

Methods for optimizing PHP programs (for better understanding) and for better understanding of php programs 1. If a method c ++ an be static, declare it static. Speed improvement is by a factor of 4. If a method can be static, make a static

What methods do you think of when we judge that the array is empty during the development process? The first thought should be the empty function, but it is wrong to use the empty function to judge whether it is null, because when the value is a

1.PHP Popen How to implement multi-process concurrency execution, the pclose in the loop waits for the process to complete before the next loop 2. Suppose there are 17 processes to open, how to implement 5 processes each time, and each process is

Methods to optimize the PHP program (learn more)-jerrylsxu 1. if a method c ++ an be static, declare it static. speed improvement is by a factor of 4. if a method can be static, it will be declared as static. The speed can be increased to 4 times. 2

In php, there are many methods to judge whether a string is null, such as null, empty, and isset, which can be used to determine whether a variable or string is null, next I will introduce it to you. string; judge whether the string is null; output..

Original address: http://blog.csdn.net/xu_fu/article/details/7829721The design of the view structure of the Android system also adopts the combination mode, that is, the view as the base class of all the graphs, viewgroup the view inheritance into

In traditional class-based languages such as Java and C + +, the essence of inheritance is to extend an existing class and generate new subclass.Because such languages strictly differentiate between classes and instances, inheritance is actually an

To develop a custom control: 1, understand how view works  2, write subclass 3 Inheriting from view, add attribute  4 for custom view class, draw control  5, respond to User message  6, customize callback function     A, view structure principle the

After the completion of the Linux from ARM processor core to the PPC processor core work, but also need to carry out uboot porting, before the analysis of Uboot is based on the arm platform, interested friends can see, links are as

Structured programming advocates the analysis of requirements by function, the main principles from top to bottom, gradually refinement, modularity and so on.advocated by the function of the software system gradually subdivided, each function is

1-Writing Modular CodeA good PHP code should be a modular code. PHP's object-oriented programming features are particularly powerful tools that can break down your application into functions or methods. You should separate the front-end

1. Ifamethodc ++ anbestatic, declareitstatic. Speedimprovementisbyafactorof4. if a method can be static, it will be declared as static. The speed can be increased to 4 times. 2. echoisfastert... "> 1. If a method c ++ an be static, declare it static.

This article has been published by the author Wu Weiwei authorized NetEase Cloud community.Welcome to NetEase Cloud Community, learn more about NetEase Technology product operation experience.When the Vue instance is initialized, it can accept the

Empty () function: mainly determines whether the variable is not empty or not 0. If the variable value is not null or not 0, true is returned; otherwise, false is returned. Differences between empty () and isset () functions: Empty () function:

Method 1 to optimize the PHP program. Ifamethodc ++ anbestatic, declareitstatic. Speedimprovementisbyafactorof4. if a method can be static, it should be declared as static. The speed can be increased to 4 times. 2. echoisfasterthanprint. echo method

$compileThis is a build service. Compile a template of an HTML string or DOM to create a function that joins the scope with the template.The compiler service mainly compiles DOM elements for instructions, and the following large section is the main

First, the storage structureBefore JDK1.8, HashMap used the bucket + chain list to implement, the essence is to adopt array + unidirectional linked list data structure. It has a fairly fast query speed primarily because it calculates the location of

1. If a method can be static, declare it static. Speed improvement are by a factor of 4. If a method is static, it is statically declared. The rate can be increased to 4 times times. 2. Echo is faster than print. echo is faster than print. 3. Use

Methods to optimize the PHP program (learn more) 1. Ifamethodc ++ anbestatic, declareitstatic. Speedimprovementisbyafactorof4. if a method can be static, make a static statement on it. The speed can be increased to 4 times. 2. echoisfasterthanprint.

First, the 3 main ways to implement custom controls are:1) Inherit existing controls to implement custom controls: primarily when the control you want to implement is similar to an existing control in many ways, by extending the existing control to