本篇文章主要介绍PHP如何生成GIF动态图片验证码,感兴趣的朋友参考下,希望对大家有所帮助。
这是一个用PHP生成GIF动画来实现动态图片验证码的程序,非常实用,是php用户注册登录界面经常需要用到的验证码程序,有需要GIF动态图片验证码功能的朋友可以收藏一下。
第一步:创建ImageCode.php文件,验证码生成函数代码如下:
<?php /** * ImageCode 生成GIF图片验证 * @param $string 字符串 * @param $width 宽度 * @param $height 高度 * */ function ImageCode($string = '', $width = 75, $height = 25) { $authstr = $string ? $string : ((time() % 2 == 0) ? mt_rand(1000, 9999) : mt_rand(10000, 99999)); $board_width = $width; $board_height = $height; // 生成一个32帧的GIF动画 for($i = 0; $i < 32; $i++) { ob_start(); $image = imagecreate($board_width, $board_height); imagecolorallocate($image, 0,0,0); // 设定文字颜色数组 $colorList[] = ImageColorAllocate($image, 15,73,210); $colorList[] = ImageColorAllocate($image, 0,64,0); $colorList[] = ImageColorAllocate($image, 0,0,64); $colorList[] = ImageColorAllocate($image, 0,128,128); $colorList[] = ImageColorAllocate($image, 27,52,47); $colorList[] = ImageColorAllocate($image, 51,0,102); $colorList[] = ImageColorAllocate($image, 0,0,145); $colorList[] = ImageColorAllocate($image, 0,0,113); $colorList[] = ImageColorAllocate($image, 0,51,51); $colorList[] = ImageColorAllocate($image, 158,180,35); $colorList[] = ImageColorAllocate($image, 59,59,59); $colorList[] = ImageColorAllocate($image, 0,0,0); $colorList[] = ImageColorAllocate($image, 1,128,180); $colorList[] = ImageColorAllocate($image, 0,153,51); $colorList[] = ImageColorAllocate($image, 60,131,1); $colorList[] = ImageColorAllocate($image, 0,0,0); $fontcolor = ImageColorAllocate($image, 0,0,0); $gray = ImageColorAllocate($image, 245,245,245); $color = imagecolorallocate($image, 255,255,255); $color2 = imagecolorallocate($image, 255,0,0); imagefill($image, 0, 0, $gray); $space = 15; // 字符间距 if($i > 0) // 屏蔽第一帧 { for ($k = 0; $k < strlen($authstr); $k++) { $colorRandom = mt_rand(0,sizeof($colorList)-1); $float_top = rand(0,4); $float_left = rand(0,3); imagestring($image, 6, $space * $k, $top + $float_top, substr($authstr, $k, 1), $colorList[$colorRandom]); } } for ($k = 0; $k < 20; $k++) { $colorRandom = mt_rand(0,sizeof($colorList)-1); imagesetpixel($image, rand()%70 , rand()%15 , $colorList[$colorRandom]); } // 添加干扰线 for($k = 0; $k < 3; $k++) { $colorRandom = mt_rand(0, sizeof($colorList)-1); // $todrawline = rand(0,1); $todrawline = 1; if($todrawline) { imageline($image, mt_rand(0, $board_width), mt_rand(0,$board_height), mt_rand(0,$board_width), mt_rand(0,$board_height), $colorList[$colorRandom]); } else { $w = mt_rand(0,$board_width); $h = mt_rand(0,$board_width); imagearc($image, $board_width - floor($w / 2) , floor($h / 2), $w, $h, rand(90,180), rand(180,270), $colorList[$colorRandom]); } } imagegif($image); imagedestroy($image); $imagedata[] = ob_get_contents(); ob_clean(); ++$i; } $gif = new GIFEncoder($imagedata); Header ('Content-type:image/gif'); echo $gif->GetAnimation(); } /** * GIFEncoder类 * */ Class GIFEncoder { var $GIF = "GIF89a"; /* GIF header 6 bytes */ var $VER = "GIFEncoder V2.06"; /* Encoder version */ var $BUF = Array ( ); var $LOP = 0; var $DIS = 2; var $COL = -1; var $IMG = -1; var $ERR = Array ( 'ERR00' =>"Does not supported function for only one image!", 'ERR01' =>"Source is not a GIF image!", 'ERR02' =>"Unintelligible flag ", 'ERR03' =>"Could not make animation from animated GIF source", ); function GIFEncoder ($GIF_src, $GIF_dly = 100, $GIF_lop = 0, $GIF_dis = 0, $GIF_red = 0, $GIF_grn = 0, $GIF_blu = 0, $GIF_mod = 'bin' ) { if (!is_array($GIF_src) && !is_array($GIF_tim)) { printf ( "%s: %s", $this->VER, $this->ERR['ERR00']); exit( 0 ); } $this->LOP = ($GIF_lop > -1) ? $GIF_lop : 0; $this->DIS = ($GIF_dis > -1) ? (( $GIF_dis < 3 ) ? $GIF_dis : 3) : 2; $this->COL = ($GIF_red > -1 && $GIF_grn > -1 && $GIF_blu > -1) ? ($GIF_red | ($GIF_grn << 8) | ($GIF_blu << 16)) : -1; for ($i = 0, $src_count = count($GIF_src); $i < $src_count; $i++ ) { if (strToLower( $GIF_mod ) == "url") { $this->BUF[] = fread (fopen($GIF_src [$i], "rb"), filesize ($GIF_src [$i])); } elseif(strToLower($GIF_mod) == "bin") { $this->BUF [ ] = $GIF_src [ $i ]; } else { printf("%s: %s ( %s )!", $this->VER, $this->ERR [ 'ERR02' ], $GIF_mod); exit(0); } if (substr($this->BUF[$i], 0, 6) != "GIF87a" && substr($this->BUF [$i], 0, 6) != "GIF89a") { printf( "%s: %d %s", $this->VER, $i, $this->ERR ['ERR01']); exit(0); } for ($j = (13 + 3 * (2 << (ord($this->BUF[$i]{10}) & 0x07 ))), $k = TRUE; $k; $j++) { switch ($this->BUF [$i]{$j}) { case "!": if ((substr($this->BUF[$i], ($j + 3), 8)) == "NETSCAPE") { printf( "%s: %s ( %s source )!", $this->VER, $this->ERR ['ERR03'], ($i + 1)); exit( 0 ); } break; case ";": $k = FALSE; break; } } } GIFEncoder::GIFAddHeader(); for($i = 0, $count_buf = count($this->BUF); $i < $count_buf; $i++) { GIFEncoder::GIFAddFrames($i, $GIF_dly[$i]); } GIFEncoder::GIFAddFooter(); } function GIFAddHeader ( ) { $cmap = 0; if (ord($this->BUF[0]{10}) & 0x80 ) { $cmap = 3 * ( 2 << ( ord ( $this->BUF [ 0 ]{10} ) & 0x07 )); $this->GIF .= substr ( $this->BUF [ 0 ], 6, 7); $this->GIF .= substr ( $this->BUF [ 0 ], 13, $cmap); $this->GIF .= "!\377\13NETSCAPE2.0\3\1" . GIFEncoder::GIFWord ( $this->LOP ) . "\0"; } } function GIFAddFrames ( $i, $d ) { $Locals_str = 13 + 3 * (2 <<(ord($this->BUF[$i]{10}) & 0x07)); $Locals_end = strlen($this->BUF[$i]) - $Locals_str - 1; $Locals_tmp = substr ($this->BUF[$i], $Locals_str, $Locals_end); $Global_len = 2 << (ord( $this->BUF [0]{10} ) & 0x07 ); $Locals_len = 2 << (ord( $this->BUF[$i]{10}) & 0x07); $Global_rgb = substr($this->BUF[0], 13, 3 * (2 << ( ord ( $this->BUF[0]{10} ) & 0x07))); $Locals_rgb = substr ( $this->BUF[$i], 13, 3 * (2 << ( ord ( $this->BUF[$i]{10} ) & 0x07))); $Locals_ext = "!\xF9\x04" . chr(($this->DIS << 2) + 0) . chr(($d >> 0) & 0xFF) . chr(($d >> 8) & 0xFF) . "\x0\x0"; if ( $this->COL > -1 && ord($this->BUF[$i]{10}) & 0x80) { for($j = 0; $j < (2 << (ord( $this->BUF[$i]{10}) & 0x07)); $j++ ) { if(ord ($Locals_rgb{3 * $j + 0}) == ($this->COL >> 0) & 0xFF && ord ( $Locals_rgb { 3 * $j + 1 } ) == ( $this->COL >> 8 ) & 0xFF && ord ( $Locals_rgb { 3 * $j + 2 } ) == ( $this->COL >> 16 ) & 0xFF ) { $Locals_ext = "!\xF9\x04" . chr(($this->DIS << 2) + 1) . chr (( $d >> 0) & 0xFF) . chr (( $d >> 8) & 0xFF) . chr ($j) . "\x0"; break; } } } switch ( $Locals_tmp { 0 } ) { case "!": $Locals_img = substr($Locals_tmp, 8, 10); $Locals_tmp = substr($Locals_tmp, 18, strlen ($Locals_tmp) - 18); break; case ",": $Locals_img = substr($Locals_tmp, 0, 10); $Locals_tmp = substr($Locals_tmp, 10, strlen($Locals_tmp) - 10); break; } if ( ord ( $this->BUF[$i]{10} ) & 0x80 && $this->IMG > -1 ) { if ( $Global_len == $Locals_len ) { if ( GIFEncoder::GIFBlockCompare ( $Global_rgb, $Locals_rgb, $Global_len ) ) { $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp ); } else { $byte = ord ( $Locals_img{9}); $byte |= 0x80; $byte &= 0xF8; $byte |= ( ord ( $this->BUF [ 0 ]{10}) & 0x07); $Locals_img{9} = chr($byte); $this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp); } } else { $byte = ord($Locals_img{9}); $byte |= 0x80; $byte &= 0xF8; $byte |= (ord($this->BUF[$i]{10}) & 0x07); $Locals_img {9} = chr($byte); $this->GIF .= ($Locals_ext . $Locals_img . $Locals_rgb . $Locals_tmp); } } else { $this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp ); } $this->IMG = 1; } function GIFAddFooter ( ) { $this->GIF .= ";"; } function GIFBlockCompare ( $GlobalBlock, $LocalBlock, $Len ) { for ( $i = 0; $i < $Len; $i++ ) { if($GlobalBlock { 3 * $i + 0 } != $LocalBlock { 3 * $i + 0 } || $GlobalBlock { 3 * $i + 1 } != $LocalBlock { 3 * $i + 1 } || $GlobalBlock { 3 * $i + 2 } != $LocalBlock{3 * $i + 2}) { return ( 0 ); } } return ( 1 ); } function GIFWord ( $int ) { return ( chr ( $int & 0xFF ) . chr ( ( $int >> 8 ) & 0xFF ) ); } function GetAnimation ( ) { return ($this->GIF); } }
第二步:验证码生成,创建yzimg.php,并引用入文件ImageCode.php。代码如下:
<?php if(!isset($_SESSION)){ session_start(); } require_once(dirname(__FILE__)."ImageCode.php"); unset($_SESSION['yzm']); $randCode = ''; $chars = 'abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPRSTUVWXYZ23456789'; for ( $i = 0; $i < 4; $i++ ) { $randCode .= substr($chars, mt_rand(0, strlen($chars) - 1), 1); } $_SESSION['yzm']=$randCode; // 记录session ImageCode($randCode, 60); /*方法二*/ /*$authstr = mt_rand(1000, 9999); // 生成随机字符串 $_SESSION['yzm'] = $authstr; // 记录session ImageCode($authstr, 60); // 显示GIF动画*/ ?>
第三步:调用和显示验证码,在需要添加验证码的页面加入以下代码,代码如下:
<input name="yzm" type="text" class="input1" size="12" style="width:70px;"/> <SCRIPT LANGUAGE="JavaScript"> <!-- document.write('<img class="yz_Img lazy" src="/static/imghwm/default1.png" data-src="yzimg.php?'+Math.random()+'" id="yz_Img" name="imageField" title="刷新验证码" onclick="this.src=this.src+Math.random();" alt="How to generate GIF dynamic picture verification code with PHP" >'); //--> </SCRIPT>
总结:以上就是本篇文的全部内容,希望能对大家的学习有所帮助。
相关推荐:
PHP数组函数array_multisort()的用法及实例分析
PHP函数import_request_variables()用法及实例分析
PHP函数shuffle()取数组若干个随机元素的方法及实例分析
The above is the detailed content of How to generate GIF dynamic picture verification code with PHP. For more information, please follow other related articles on the PHP Chinese website!

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

Notepad++7.3.1
Easy-to-use and free code editor

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

Dreamweaver CS6
Visual web development tools