alphanumeric character set

This article takes 65,541,694,158 as an example, introduces the method of implementing the character alphanumeric, the code is easy to understand, the specific code is as follows: to Word alphanumeric thousand semicolon

1. What is a character set?Characters: text, symbols. Contains various national text, punctuation, graphics, numbers, etc.Character Set: A collection of multiple characters (multiple text, a collection of symbols), with different character sets

In the actual project development often encounter verification code problems, such as landing page, Message page, registration page ... The principle of verification code is very simple: the use of the GD library to create a picture, the image of

Copy CodeThe code is as follows: /** Captcha Class base on PHP GD Lib* @author Design* @version 1.0* @demo* Include (' captchaclass.php ');* $captchaDemo =new Captcha ();* $captchaDemo->createimage ();*/Class captcha{@ Define CAPTCHA Picture

Problem DescriptionEnter a string of characters to count the number of letters, number of digits, space words, and other characters (up to 100 characters) of the string characterInputMultiple sets of test data, one set per lineOutputEach group

English with numbers Header ("Content-type:image/png"); Define header, declare picture file, preferably PNG, no copyright disturbance; Generate a new four-bit integer verification code Session_Start ();//open session; $authnum _session = "; $str = '

Problem: Existing letters and numbers mixed with data that you want to sort by numbers or character parts. Consider this view:CreateView VAsSelect Concat (ename, ", Deptno) from EMP;Mysql> select * from V;+---------------------------+| Concat (ename,

PHP extension text processing -- PCRE regular expression syntax 6 -- Character class (square brackets) and optional path (|) Character class (square brackets) The left square brackets start the description of a character class and end with square

A knowledge reserve for understanding character encoding1. Basic Computer knowledge2. principle of Text Editor Access file (Nodepad++,pycharm,word)# 1, open the editor opens a process, is in memory, so, the content written with the editor is stored

CMD character command use@\ \ Hide the echo of the command.~\ \ In for indicates the use of an enhanced variable extension;A string in set that represents the location specified using the extended environment variable;The bitwise inverse is