how to insert captcha in php

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Functions of the GD library 1,imagecreatetruecolor-----Create a true-color image Imagecreatetruecolor (int x_size,int y_size)//x is wide, y represents high 2,imagecolorallocate Assigning color (palette) to an image Imagecolorallocate (Resource Image,

Preface Hello everyone I am: The stone is not easy, today I brought the PHP base Class Library prototype version of the teaching article, so my work line has been divided into three categories, namely: JavaScript front-end Framework (package library)

"PHP Basic Class Library" Prototype prototype teaching articles! Preface Hello everyone I am: The stone is not easy, today I brought the PHP base Class Library prototype version of the teaching article, so my work line has been divided into three

The authentication Code (CAPTCHA) is the abbreviation for "completely automated public Turing test to tell Computers and humans Apart" (fully automatic distinguishing between computer and human Turing tests), It is a public automatic program that

How to integrate GooglereCAPTCHA verification code in Laravel5 forms 1. Introduction Sometimes we need to use verification codes when submitting forms to prevent malicious operations such as irrigation and robots. There are many open-source

This article mainly introduces how to create and use a Model in Yii, and analyzes in detail the basic creation techniques, usage methods, and related Precautions of the Model in Yii Based on the instance form, for more information about how to

0x01 backgroundFirst we understand the next wide-byte injection, which stems from the programmer setting the MySQL connection with an error configured as: Set CHARACTER_SET_CLIENT=GBK, which causes an injection vulnerability caused by the encoding

PHP learning notes user registration module user class and verification code class. Therefore, paste the code of the first chapter and reusable classes to facilitate future reference and supply to friends who need them. : User class, including

  Verification Code (CAPTCHA) is an abbreviation for "completely automated public Turing test to tell Computers and humans Apart" (fully automatic distinguishing between computer and human Turing tests) A public fully automated procedure for