国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Table of Contents
A simple example of PHP generating a verification code that can be clicked to refresh, an example of php generating a verification code
Home Backend Development PHP Tutorial PHP generates a simple example of a verification code that can be clicked to refresh, PHP generates a verification code example_PHP tutorial

PHP generates a simple example of a verification code that can be clicked to refresh, PHP generates a verification code example_PHP tutorial

Jul 12, 2016 am 08:52 AM
php Verification code

A simple example of PHP generating a verification code that can be clicked to refresh, an example of php generating a verification code

This article describes an example of PHP generating a verification code that can be clicked to refresh. Share it with everyone for your reference, the details are as follows:

html file:

<html>
 <head>
   <title>驗(yàn)證碼</title>
 </head>
  <script type="text/javascript">
    function yanzheng(){
      var im=document.getElementsByTagName("img");
      im[0].src="gd.php&#63;temp="+(new Date().getTime().toString(36));
    }
  </script>
 <body>
  <img src="gd.php"/><a href="#" onclick="yanzheng()">換一張</a>
 </body>
</html>

Verification code file gd.php: 

<&#63;php
$im=imagecreate(50,20);
$b=imagecolorallocate($im,0,0,0);
$w=imagecolorallocate($im,255,255,255);
$mask="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$text="";
for($i=1;$i<=4;$i++){
  $index=rand(0,61);
  $text.=$mask{$index};
}
imagestring($im,3,rand(10,20),rand(0,10),$text,$w);
header("Content-type:image/jpeg");
imagejpeg($im);
&#63;>

Readers who are interested in more PHP-related content can check out the special topics of this site: "Summary of PHP graphics and image operation skills", "Summary of PHP file operations", "Summary of PHP operations and operator usage", "PHP network programming" Skills Summary", "PHP Basic Syntax Introductory Tutorial", "php Office Document Operation Skills Summary (including word, excel, access, ppt)", "php date and time usage summary", "php object-oriented programming introductory tutorial", "Summary of php string usage", "Introduction to php mysql database operation tutorial" and "Summary of common php database operation skills"

I hope this article will be helpful to everyone in PHP programming.

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1127914.htmlTechArticlePHP generates a simple example of a verification code that can be clicked to refresh, an example of PHP generating a verification code. This article tells an example of PHP generating a clickable verification code. Refresh verification code. Share it with everyone for your reference, the details are as follows:...
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How do I stay up-to-date with the latest PHP developments and best practices? How do I stay up-to-date with the latest PHP developments and best practices? Jun 23, 2025 am 12:56 AM

TostaycurrentwithPHPdevelopmentsandbestpractices,followkeynewssourceslikePHP.netandPHPWeekly,engagewithcommunitiesonforumsandconferences,keeptoolingupdatedandgraduallyadoptnewfeatures,andreadorcontributetoopensourceprojects.First,followreliablesource

What is PHP, and why is it used for web development? What is PHP, and why is it used for web development? Jun 23, 2025 am 12:55 AM

PHPbecamepopularforwebdevelopmentduetoitseaseoflearning,seamlessintegrationwithHTML,widespreadhostingsupport,andalargeecosystemincludingframeworkslikeLaravelandCMSplatformslikeWordPress.Itexcelsinhandlingformsubmissions,managingusersessions,interacti

How to set PHP time zone? How to set PHP time zone? Jun 25, 2025 am 01:00 AM

TosettherighttimezoneinPHP,usedate_default_timezone_set()functionatthestartofyourscriptwithavalididentifiersuchas'America/New_York'.1.Usedate_default_timezone_set()beforeanydate/timefunctions.2.Alternatively,configurethephp.inifilebysettingdate.timez

How do I validate user input in PHP to ensure it meets certain criteria? How do I validate user input in PHP to ensure it meets certain criteria? Jun 22, 2025 am 01:00 AM

TovalidateuserinputinPHP,usebuilt-invalidationfunctionslikefilter_var()andfilter_input(),applyregularexpressionsforcustomformatssuchasusernamesorphonenumbers,checkdatatypesfornumericvalueslikeageorprice,setlengthlimitsandtrimwhitespacetopreventlayout

What is data serialization in PHP (serialize(), unserialize())? What is data serialization in PHP (serialize(), unserialize())? Jun 22, 2025 am 01:03 AM

ThePhpfunctionSerialize () andunserialize () AreusedtoconvertcomplexdaTastructdestoresintostoraSandaBackagain.1.Serialize () c OnvertsdatalikecarraysorobjectsraystringcontainingTypeandstructureinformation.2.unserialize () Reconstruct theoriginalatataprom

How do I embed PHP code in an HTML file? How do I embed PHP code in an HTML file? Jun 22, 2025 am 01:00 AM

You can embed PHP code into HTML files, but make sure that the file has an extension of .php so that the server can parse it correctly. Use standard tags to wrap PHP code, insert dynamic content anywhere in HTML. In addition, you can switch PHP and HTML multiple times in the same file to realize dynamic functions such as conditional rendering. Be sure to pay attention to the server configuration and syntax correctness to avoid problems caused by short labels, quotation mark errors or omitted end labels.

What are the best practices for writing clean and maintainable PHP code? What are the best practices for writing clean and maintainable PHP code? Jun 24, 2025 am 12:53 AM

The key to writing clean and easy-to-maintain PHP code lies in clear naming, following standards, reasonable structure, making good use of comments and testability. 1. Use clear variables, functions and class names, such as $userData and calculateTotalPrice(); 2. Follow the PSR-12 standard unified code style; 3. Split the code structure according to responsibilities, and organize it using MVC or Laravel-style catalogs; 4. Avoid noodles-style code and split the logic into small functions with a single responsibility; 5. Add comments at key points and write interface documents to clarify parameters, return values ??and exceptions; 6. Improve testability, adopt dependency injection, reduce global state and static methods. These practices improve code quality, collaboration efficiency and post-maintenance ease.

How do I execute SQL queries using PHP? How do I execute SQL queries using PHP? Jun 24, 2025 am 12:54 AM

Yes,youcanrunSQLqueriesusingPHP,andtheprocessinvolveschoosingadatabaseextension,connectingtothedatabase,executingqueriessafely,andclosingconnectionswhendone.Todothis,firstchoosebetweenMySQLiorPDO,withPDObeingmoreflexibleduetosupportingmultipledatabas

See all articles