image.func.php
<?php require_once('string.func.php'); function verifyImage( $type=1,$length=4,$pixel=0,$line=0,$sess_name="verify"){ session_start(); /*定义长度和宽度*/ $width=80; $height=30; /* 创建画布*/ $image=imagecreatetruecolor($width, $height); /*本函数用来匹配图形的颜色,供其它绘图函数使用。参数 image 表示图形的 handle。参数 red、green、blue 是色彩三原色,其值从 0 至 255....我在此定义黑色和白色*/ $white=imagecolorallocate($image, 255, 255, 255); $black=imagecolorallocate($image,0,0,0); /*本函数将图片的封闭长方形区域着色。参数 x1、y1 及 x2、y2 分别为矩形对角线的坐标。参数 col 表示欲涂上的颜色*/ imagefilledrectangle($image, 1, 1, $width-2, $height-2, $white); /*buildRandomString函数用来生成一个验证码*/ $chars=buildRandomString($type,$length); /*将验证码给session以便用来判断用户输入是否正确*/ $_SESSION[$sess_name]=$chars; /*定义字体库*/ $fontfiles=array('msyh.ttf','msyhbd.ttf','simsun.ttc','SIMYOU.TTF','STHUPO.TTF','STKAITI.TTF','STLITI.TTF'); /*用循环来将验证码一个一个的写入图片中*/ for($i=0;$i<$length;$i++) { $size=mt_rand(14,18); $angle=mt_rand(-15,15); /*验证码的横坐标与纵坐标*/ $x=5+$i*$size; $y=mt_rand(20,26); $color=imagecolorallocate($image,mt_rand(50,190),mt_rand(50,200),mt_rand(50,90)); $fontfile="../font/".$fontfiles[mt_rand(0,count($fontfiles)-1)]; $text=substr($chars,$i,1); /*本函数将 TTF (TrueType Fonts) 字型文字写入图片*/ imagettftext($image, $size, $angle, $x, $y, $color, $fontfile, $text); } if($pixel) { for($i=0;$i<50;$i++) { /*本函数可在图片上绘出一点。参数 x、y 为欲绘点的坐标,参数 col 表示该点的颜色*/ imagesetpixel($image, mt_rand(0,$width-1), mt_rand(0,$height-1), $black); }} if($line) { for($i=0;$i<10;$i++) { $color=imagecolorallocate($image,mt_rand(50,90),mt_rand(50,200),mt_rand(50,90)); /*画线段*/ imageline($image, mt_rand(0,$width-1), mt_rand(0,$height-1), mt_rand(0,$width-1), mt_rand(0,$height-1), $color); } } /*以gif形式输出*/ header("content-type:image/gif"); /*建立GIF图 并输出到网页*/ imagegif($image); /*释放与 image 关联的内存*/ imagedestroy($image); }
string.func.php
<?php function buildRandomString($type=1,$length=4){ if($type==1) { /*join函数把数组转换为字符串。。join() 函数是 implode() 函数的别名*/ $chars=join("",range(0,9)); }elseif ($type==2) { /*array_merge函数合并数组*/ $chars=join("",array_merge(range("a","z"),range("A","Z"))); }elseif($type==3) { $chars=join("",array_merge(range("a","z"),range("A","Z"),range(0,9))); } if($length>strlen($chars)) { exit("字符串长度不够"); } /*打乱字符串*/ $chars=str_shuffle($chars); return substr($chars,0,$length); } ?>

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.


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