php 生成gif验证码出错
php动态生成gif图像时遇到了一些问题,现已解决,我用的是php4.05(for win32)+apache3.1.2_win32。
问题一:动态生成gif的程序根本转不起来
我写了一个关于用php生成gif的例子,运行,发现页面就是刷不出来,就象是死了一样,浏览器也没有任何错误提示。
解决办法:修改php所在目录下的php.ini
修改安装php所在路径下的php.ini(注意:一定是php路径下的php.ini)extension_dir = 安装php的路径extensions(比如:c:phpextensions)。
问题二:php_gd.dll不支持gif
php 生成gif验证码出错
我在程序的开头加载了php_gd.dll动态连接库:dl("php_gd.dll");但是在运行程
Warning: ImageGif: No GIF support in this PHP build in d:apachehtdocsgif2.php3 on line 12
。
解决办法:使用php4.05
这时我才发现是书上写的问题php_gd.dll根本不能支持生成gif,经高人指引才知道自己的版本php4.04 for win32缺少php_gd_gif.dll,于是我下载了一份更高版本的php4.05,这里面有支持生成动态gif的php_gd_gif.dll。
问题三:出现警告:Warning: Function registration failed - duplicate name - imagearc in d:apachehtdocsgif2.php3 on line 3
程序如下:
dl("php_gd_gif.dll");
header("content-type:image/gif");
$im = imagecreate(400,30);
$black = imagecolorallocate($im,0,0,0);
$white = imagecolorallocate($im,255,255,255);
imageline( $im,200,15,215,15,$white);
imagestring($im, 5, 4, 10, "This is a Gif", $white);
imagegif($im);
imagedestroy($im);
?>
解决办法:修改程序或者php.ini
dl()函数是用来加载dll的,但如果在php.ini文件中将所需要的dll前面的“;”已经去掉的话,那么这时就不要使用这个函数。
如果ini文件中extension=php_gd_gif.dll前的“;”没有去,那么就要用dl("php_gd_gif.dll");加载,总之:此两者是互异的,不然服务器认为是重复命名。
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1378
52
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.


