Table of Contents
回复内容:
Home Backend Development PHP Tutorial javascript - php制作中文验证码的文字数组问题

javascript - php制作中文验证码的文字数组问题

Jun 06, 2016 pm 08:09 PM
javascript php python

<code>在做一个php中文验证码时,按原本的思路是将一段文字分割成一个个文字组成个文字数组,然后遍历四次,随机生成四个验证文字,然后画在image上,可是发现用`str_split($str,3)`来分割有时会少一个文字,换成`explode(" ",$str)`还是偶尔缺字。。。

主要代码如下:`

 $fontFace='aa.ttf';
    $str=" 大 闸 是 中 国 主 导 品 牌 亦 行 业 协 会 重 点 推 荐 家 集 养 殖 与 销 售";
    $strDb=str_split($str,3);
for($i=0;$i</code>
Copy after login
Copy after login

回复内容:

<code>在做一个php中文验证码时,按原本的思路是将一段文字分割成一个个文字组成个文字数组,然后遍历四次,随机生成四个验证文字,然后画在image上,可是发现用`str_split($str,3)`来分割有时会少一个文字,换成`explode(" ",$str)`还是偶尔缺字。。。

主要代码如下:`

 $fontFace='aa.ttf';
    $str=" 大 闸 是 中 国 主 导 品 牌 亦 行 业 协 会 重 点 推 荐 家 集 养 殖 与 销 售";
    $strDb=str_split($str,3);
for($i=0;$i</code>
Copy after login
Copy after login

javascript - php制作中文验证码的文字数组问题
两个点,第一个是$str不用空格分开,第二个是生成随机index的时候,应该是-1,不是+1
像这种取数组中某个随机值的时候,index可以用array_rand()函数来生成
改完如下

<code>$fontFace='aa.ttf';
    $str="大闸是中国主导品牌亦行业协会重点推荐家集养殖与销售";
    $strDb=str_split($str,3);
for($i=0;$i</code>
Copy after login

用mb扩展的函数处理字符串,解决编码问题,另外空格有啥用么?

如果$str含中英文用这个分割$strDb=preg_split('//u', $str, -1, PREG_SPLIT_NO_EMPTY);

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

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.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

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)

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

Is the conversion speed fast when converting XML to PDF on mobile phone? Is the conversion speed fast when converting XML to PDF on mobile phone? Apr 02, 2025 pm 10:09 PM

The speed of mobile XML to PDF depends on the following factors: the complexity of XML structure. Mobile hardware configuration conversion method (library, algorithm) code quality optimization methods (select efficient libraries, optimize algorithms, cache data, and utilize multi-threading). Overall, there is no absolute answer and it needs to be optimized according to the specific situation.

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

How to convert XML files to PDF on your phone? How to convert XML files to PDF on your phone? Apr 02, 2025 pm 10:12 PM

It is impossible to complete XML to PDF conversion directly on your phone with a single application. It is necessary to use cloud services, which can be achieved through two steps: 1. Convert XML to PDF in the cloud, 2. Access or download the converted PDF file on the mobile phone.

What is the function of C language sum? What is the function of C language sum? Apr 03, 2025 pm 02:21 PM

There is no built-in sum function in C language, so it needs to be written by yourself. Sum can be achieved by traversing the array and accumulating elements: Loop version: Sum is calculated using for loop and array length. Pointer version: Use pointers to point to array elements, and efficient summing is achieved through self-increment pointers. Dynamically allocate array version: Dynamically allocate arrays and manage memory yourself, ensuring that allocated memory is freed to prevent memory leaks.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

Is there a mobile app that can convert XML into PDF? Is there a mobile app that can convert XML into PDF? Apr 02, 2025 pm 09:45 PM

There is no APP that can convert all XML files into PDFs because the XML structure is flexible and diverse. The core of XML to PDF is to convert the data structure into a page layout, which requires parsing XML and generating PDF. Common methods include parsing XML using Python libraries such as ElementTree and generating PDFs using ReportLab library. For complex XML, it may be necessary to use XSLT transformation structures. When optimizing performance, consider using multithreaded or multiprocesses and select the appropriate library.

How to convert xml into pictures How to convert xml into pictures Apr 03, 2025 am 07:39 AM

XML can be converted to images by using an XSLT converter or image library. XSLT Converter: Use an XSLT processor and stylesheet to convert XML to images. Image Library: Use libraries such as PIL or ImageMagick to create images from XML data, such as drawing shapes and text.

See all articles