本文实例讲述了php中文验证码实现方法。分享给大家供大家参考。具体分析如下:
先看如下效果图:
具体代码如下:
<?php /********************************* * Code by Gently * 24/07/07 *严正声明:验证码为程序随机生成,“某种巧合”的词语组合属于正常现象 , *某些别有用心的人不要借题发挥! *Power by ZendStudio.Net *********************************/ session_start(); header("Content-type: image/PNG"); $w=180; $h=60; $fontface="C:\WINDOWS\Fonts\MSYH.TTF"; //字体文件 $str = "们以我到他会作时要动国产的一是工就年阶义发成部民可出能方进在 了不和有大这主中人上为来分生对于学下级地个用同行面说种过命度革而多子 后自社加小机也经力线本电高量长党得实家定深法表着水理化争现所二起政三 好十战无农使性前等反体合斗路图把结第里正新开论之物从当两些还天资事队 批点育重其思与间内去因件日利相由压员气业代全组数果期导平各基或月毛然 如应形想制心样干都向变关问比展那它最及外没看治提五解系林者米群头意只 明四道马认次文通但条较克又公孔领军流入接席位情运器并飞原油放立题质指 建区验活众很教决特此常石强极土少已根共直团统式转别造切九你取西持总料 连任志观调七么山程百报更见必真保热委手改管处己将修支识病象几先老光专 什六型具示复安带每东增则完风回南广劳轮科北打积车计给节做务被整联步类 集号列温装即毫知轴研单色坚据速防史拉世设达尔场织历花受求传口断况采精 金界品判参层止边清至万确究书术状厂须离再目海交权且儿青才证低越际八试 规斯近注办布门铁需走议县兵固除般引齿千胜细影济白格效置推空配刀叶率述 今选养德话查差半敌始片施响收华觉备名红续均药标记难存测士身紧液派准斤 角降维板许破述技消底床田势端感往神便贺村构照容非搞亚磨族火段算适讲按 值美态黄易彪服早班麦削信排台声该击素张密害侯草何树肥继右属市严径螺检 左页抗苏显苦英快称坏移约巴材省黑武培著河帝仅针怎植京助升王眼她抓含苗 副杂普谈围食射源例致酸旧却充足短划剂宣环落首尺波承粉践府鱼随考刻靠够 满夫失包住促枝局菌杆周护岩师举曲春元超负砂封换太模贫减阳扬江析亩木言 球朝医校古呢稻宋听唯输滑站另卫字鼓刚写刘微略范供阿块某功套友限项余倒 卷创律雨让骨远帮初皮播优占死毒圈伟季训控激找叫云互跟裂粮粒母练塞钢顶 策双留误础吸阻故寸盾晚丝女散焊功株亲院冷彻弹错散商视艺灭版烈零室轻血 倍缺厘泵察绝富城冲喷壤简否柱李望盘磁雄似困巩益洲脱投送奴侧润盖挥距触 星松送获兴独官混纪依未突架宽冬章湿偏纹吃执阀矿寨责熟稳夺硬价努翻奇甲 预职评读背协损棉侵灰虽矛厚罗泥辟告卵箱掌氧恩爱停曾溶营终纲孟钱待尽俄 缩沙退陈讨奋械载胞幼哪剥迫旋征槽倒握担仍呀鲜吧卡粗介钻逐弱脚怕盐末阴 丰雾冠丙街莱贝辐肠付吉渗瑞惊顿挤秒悬姆烂森糖圣凹陶词迟蚕亿矩康遵牧遭 幅园腔订香肉弟屋敏恢忘编印蜂急拿扩伤飞露核缘游振操央伍域甚迅辉异序免 纸夜乡久隶缸夹念兰映沟乙吗儒杀汽磷艰晶插埃燃欢铁补咱芽永瓦倾阵碳演威 附牙芽永瓦斜灌欧献顺猪洋腐请透司危括脉宜笑若尾束壮暴企菜穗楚汉愈绿拖 牛份染既秋遍锻玉夏疗尖殖井费州访吹荣铜沿替滚客召旱悟刺脑措贯藏敢令隙 炉壳硫煤迎铸粘探临薄旬善福纵择礼愿伏残雷延烟句纯渐耕跑泽慢栽鲁赤繁境 潮横掉锥希池败船假亮谓托伙哲怀割摆贡呈劲财仪沉炼麻罪祖息车穿货销齐鼠 抽画饲龙库守筑房歌寒喜哥洗蚀废纳腹乎录镜妇恶脂庄擦险赞钟摇典柄辩竹谷 卖乱虚桥奥伯赶垂途额壁网截野遗静谋弄挂课镇妄盛耐援扎虑键归符庆聚绕摩 忙舞遇索顾胶羊湖钉仁音迹碎伸灯避泛亡答勇频皇柳哈揭甘诺概宪浓岛袭谁洪 谢炮浇斑讯懂灵蛋闭孩释乳巨徒私银伊景坦累匀霉杜乐勒隔弯绩招绍胡呼痛峰 零柴簧午跳居尚丁秦稍追梁折耗碱殊岗挖氏刃剧堆赫荷胸衡勤膜篇登驻案刊秧 缓凸役剪川雪链渔啦脸户洛孢勃盟买杨宗焦赛旗滤硅炭股坐蒸凝竟陷枪黎救冒 暗洞犯筒您宋弧爆谬涂味津臂障褐陆啊健尊豆拔莫抵桑坡缝警挑污冰柬嘴啥饭 塑寄赵喊垫丹渡耳刨虎笔稀昆浪萨茶滴浅拥穴覆伦娘吨浸袖珠雌妈紫戏塔锤震 岁貌洁剖牢锋疑霸闪埔猛诉刷狠忽灾闹乔唐漏闻沈熔氯荒茎男凡抢像浆旁玻亦 忠唱蒙予纷捕锁尤乘乌智淡允叛畜俘摸锈扫毕璃宝芯爷鉴秘净蒋钙肩腾枯抛轨 堂拌爸循诱祝励肯酒绳穷塘燥泡袋朗喂铝软渠颗惯贸粪综墙趋彼届墨碍启逆卸 航衣孙龄岭骗休借"; $code=""; for($i=0;$i<4;$i++){ $Xi=mt_rand(0,strlen($str)/2); if($Xi%2) $Xi+=1; $code.=substr($str,$Xi,2); } $_SESSION['code']=$code; $im=imagecreatetruecolor($w,$h); $bkcolor=imagecolorallocate($im,250,250,250); imagefill($im,0,0,$bkcolor); /***添加干扰***/ for($i=0;$i<15;$i++){ $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand (0,255),mt_rand(0,255)); imagearc($im,mt_rand(-10,$w),mt_rand(-10,$h),mt_rand (30,300),mt_rand(20,200),55,44,$fontcolor); } for($i=0;$i<255;$i++){ $fontcolor=imagecolorallocate($im,mt_rand(0,255),mt_rand (0,255),mt_rand(0,255)); imagesetpixel($im,mt_rand(0,$w),mt_rand(0,$h),$fontcolor); } /***********内容*********/ for($i=0;$i<4;$i++){ $fontcolor=imagecolorallocate($im,mt_rand(0,120),mt_rand (0,120),mt_rand(0,120)); //这样保证随机出来的颜色较深。 $codex=iconv("GB2312","UTF-8",substr($code,$i*2,2)); imagettftext($im,mt_rand(20,24),mt_rand(- 60,60),40*$i+20,mt_rand(30,35),$fontcolor,$fontface,$codex); } imagepng($im); ?>
希望本文所述对大家的php程序设计有所帮助。

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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