use if

An algorithm !! The existing range is $ start -- $ end (for example, 5--10 ). Give a variable $ param: If $ param If $ param> $ end, $ param = $ end No logic algorithms such as if else and ternary (although simple and efficient) Realistic

Php uploads and downloads files ). Php implements file upload and download (in). If you do not want to see the information, you can use the error suppression symbol @. of course, you can assign values to variables for echo; define using php to

PHP problem summary: Summary of PHP optimization and efficient acceleration-Linux Enterprise Application-Linux server application information. The following is a detailed description. 1. In a function, it is more efficient to use return when passing

Previously felt the shift operator is quite clear, perhaps the study of time long, and then a look, forget almost. Now refer to some of the online learning materials, the displacement operator collation, as a summary of knowledge points, but also a

The freewheeling diodes are both ends of the parallel coils, which generate inductive emf at both ends of the coil as it passes through the current. When the current disappears, its inductive EMF generates a reverse voltage to the original in the

This time the main thing to say is how the cache is the freshness of judgment. The last book says that every resource in the cache has its own shelf life, which we call freshness. When a resource is in this shelf life, the cache thinks it is fresh

It is recommended to use else if.in PHP(PHP 4, PHP 5)ElseIf, as implied by this name, is the combination of if and else . As with else , it extends the if statement and can execute different statements when the original if expression FALSE value

The great Bill Gates once said:640K ought to being enough for Everybody-bill Gates 1981Programmers often write memory-management programs that are often scary. If you do not want to accidents, the only solution is to find all the hidden mines and

Typeof (VAR) is used to determine whether a variable is an array. Javascript often requires operations on HTML controls. As you know, if the names of HTML spaces are the same, You can use document. getelementsbyname to obtain an array. If you

Currently, the singleton mode is not fully implemented using static functions. 1. Ease of use: If Initialization is required, the singleton mode can be completed in the constructor. the class of all static functions requires an additional function

When reading xml files with a large amount of data, although it supports XPath, it is easier to query, but you need to load them first, which wastes the memory and is relatively slow to use. If XMLReader is used, it does not need to be cached. When

It is important to back up your database when database tables are lost or damaged. In the event of a system crash, you must be able to restore as much data as possible from your table to the state at the time of the crash. Sometimes it is the MySQL

Connect to MySQL using the Mysqli library, which supports both object-oriented and process-oriented approaches: 1. How to use object-oriented Establish a connection $db = new mysqli (' localhost ', ' root ', ' 123456 ', ' dbname '); Select the

Today, I installed a zen-cart friendship link plug-in. the plug-in for Chinese websites is not easy to use. if you want to find it, go to the English website to download the latest version. It is better to use English. When importing a table, pay

Very simple program logic problems. array judgment. for example, $ arr is an array. to determine whether it is null, you can use: if (! Empty ($ arr) {or if (count ($ arr) & gt; 0) {or if ($ arr! = '') {I often see this in other people's code, but I

In php, The is_file () function is used to determine whether a file exists. It is also very simple to use. If you need it, refer to it. In php, The is_file () function is used to determine whether a file exists. It is also very simple to use. If you

In this project, I am mainly used to accumulate and record my development experience in project development and learning practice using COCOS2DX engine. Every day of development tasks, to see what others share, always be able to reap the desirable

Nyoj 239:http://acm.nyist.net/judgeonline/problem.php?pid=239Ural 1109:http://acm.timus.ru/problem.aspx?space=1&num=1109Nyoj Matchmaker The problem, is the bare maximum match, very annoying is the adjacency array timeout. Use the adjacency table

JavaScript Basics 021. Data typeThe description of the data type has been written to the link in the extension of the previous articleBecause the ECMAScript data type is dynamic, it does not have to be necessary to define other data types. This is a

The selection structure (a) uses the basic if selection structure to master the logical operators, master the multiple if selection structure, and master the If selection structure, for example: If Zhang Hao's jav A test score of more