


PHP+javascript creates verification code source code with prompts for sharing
html code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>简单验证码</title> </head> <script language="javascript" src="js/checked.js"></script> <body> <form id="register" name="register" method="post" > <table align="center"> <tr> <td ><div align="right">验证码:</div></td> <td ><input id="yzm" type="text" name="yzm" size="8" onBlur="javascript:chkyzm(form)" onMouseOver="this.style.backgroundColor='#ffffff'" onMouseOut="this.style.backgroundColor='#e8f4ff'"/></td><td> <input id="yzm2" type="hidden" value="" /></td> <td align="center" valign="middle"><script>yzm()</script></td> <td ><a href="javascript:code()" style="text-decoration:none">看不清</a></td> <td width="150" align="center"><div id="yzm1"><font color="#999999">请输入验证码</font></div></td> </tr> </table> </form> </body> </html>
JS code:
function chkyzm(form){ //对验证码进行验证 if(form.yzm.value==""){ yzm1.innerHTML="<font color=#FF0000>×验证码不能为空</font>"; }else if(form.yzm.value!=form.yzm2.value){ yzm1.innerHTML="<font color=#FF0000>×验证码输入错误</font>"; }else{ yzm1.innerHTML="<font color=green>√验证码输入正确</font>"; } } function yzm(){ //生成验证码 var num1=Math.round(Math.random()*1000000);//随机小数放大 var num=num1.toString().substr(0,4);//取4位整数 var yzm2=document.getElementById("yzm2"); document.write("<img src="/static/imghwm/default1.png" data-src="yzm.php?num=" class="lazy" name=codeimg src=yzm.php?num="+num+"' alt="PHP+javascript creates verification code source code with prompts for sharing" >"); yzm2.value=num; } function code(){ //重置验证码 var num1=Math.round(Math.random()*1000000); var num=num1.toString().substr(0,4); var yzm2=document.getElementById("yzm2"); document.codeimg.+num; yzm2.value=num; }
yzm.php code:
<?php header("Content-type: image/png"); $im=imagecreate(66,22); //创建画布 $black=imagecolorallocate($im,0,0,0); //定义背景 $white=imagecolorallocate($im,255,255,255); //定义背景 $gray=imagecolorallocate($im,200,200,200); //定义背景 imagefill($im,0,0,$gray); //填充颜色 for($i=0;$i<4;$i++){ //定义4位随机数 $str=mt_rand(1,5); //定义随机字符所在位置的的Y坐标 $size=mt_rand(6,9); //定义随机字符的字体 $authnum=substr($_GET[num],$i,1); //获取超级链接中传递的验证码 imagestring($im,$size,(3+$i*15),$str,$authnum,imagecolorallocate($im,rand(0,250),rand(0,250),rand(0,250)));//rand(0,500)数字的模糊程度 } //水平输出字符串 for($i=0;$i<200;$i++){ //执行for循环,为验证码添加模糊背景 $randcolor=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255)); //创建背景 imagesetpixel($im,rand()%70,rand()%30,$randcolor); //绘制单一元素 } imagepng($im); //生成png图像 imagedestroy($im); //销毁图像 ?>
Note: PHP needs to be configured to execute related methods.
For more PHP+javascript production and prompt verification code source code sharing related articles, please pay attention to the PHP Chinese website!

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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