generate alphanumeric random number in php

Now start to generate a variety of PHP verification code journey, novice to drive, please swipe!First of all, let's start mister into a background image with a CAPTCHANote: There is no imagejpg () function, only the imagepng ()

Php generates 12-digit, unique-digit, and alphanumeric member card numbers without querying the database. when each member logs in, a unique membership card number is generated. Share to: more --- php generates 12-digit non-repeating alphanumeric

Php generates 12-digit, unique-digit, and alphanumeric member card numbers without querying the database. when each member logs in, a unique membership card number is generated. Share to: more php generate 12-digit non-repeating alphanumeric

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

In the previous we have introduced the PHP random number generation method, but did not specifically describe the generated PHP random number is what, then we will introduce the PHP random generation of digital letter combination method, an example

This article is excerpted from: php functions implementation principles and performance analysis. functions are one of the most basic technical units in any language. What are the features of php functions? How is function call implemented? What is

Implementation principle and performance analysis of PHP Functions Author: Baidu engineer hdk PrefaceIn any language, a function is the most basic component unit. What are the features of PHP functions? How is function calling implemented? What is

HDK (Baidu)ObjectiveIn any language, a function is the most basic constituent unit. What are the features of PHP functions? How is a function call implemented? What is the performance of PHP functions and what are the suggestions for using them?

ObjectiveIn any language, a function is the most basic constituent unit. What are the features of PHP functions? How is a function call implemented? What is the performance of PHP functions and what are the suggestions for using them?This paper will