这阵子在开发一个小功能，就是类似论坛个性签名的东西，根据会员信息自动生成一张图片上面还有文字的那种。图片的拼合用imagecopy()和imagecopyresampled()等函数就可以搞定，到了画文字的时候遇到了一个难题。
文字的模板是保存在一个文本文件中，程序先读取这个文件然后用数据替换掉里面的变量，再使用imagettftext()函数画到图片上，不幸的是画出来的图片居然是乱码@_@……于是上Google搜索相关的问题，发现大部分人都是在说imagettftext()函数中传递的字串要UTF-8编码，而PHP官方手册中也明确写着“UTF-8编码的字串可以直接传递”，可问题是模板文件的编码本来就是UTF-8的，这就有点莫名其妙了。无奈之下我用EmEditor打开原来的模板文件，尝试转换成不同的编码后和GD输出的乱码做对比，结果发现转换到EUC-JP编码的时候居然和GD输出的乱码吻合了……也就是说，这里服务器上GD的默认编码是EUC-JP，而那是一种日文编码。
查找了一下php.ini的设置没有发现相关选项，于是又一个问题来了，这个默认编码是在哪里设置的呢?还是史文大哥牛，发现了PHP 编译参数里面有一个“–enable-gd-jis-conv”的参数十分可疑，Google一下果然发现了很多乱码问题与这个编译参数有关……官方给出的参数说明是“GD: Enable JIS-mapped Japanese font support.”，也就是让GD支持日文编码的字库(可恶，为什么没有支持中文编码字库的编译选项……PHP也国籍歧视么= =b)，说白了开启了这个选项的话GD就会把TTF字库中大于127的部分(即不属于标准拉丁文字库的部分)按照日文JIS的顺序来映射，那么用来映射中文字体的时候自然就变成乱码了。二话不说，去掉这个选项重新编译，问题解决。去掉这个选项之后，imagettftext()的默认编码就变成了UTF- 8，就可以正常显示中文了～
PHP's Current Status: A Look at Web Development TrendsApr 13, 2025 am 12:20 AMPHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.
PHP vs. Other Languages: A ComparisonApr 13, 2025 am 12:19 AMPHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP vs. Python: Core Features and FunctionalityApr 13, 2025 am 12:16 AMPHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.
PHP: A Key Language for Web DevelopmentApr 13, 2025 am 12:08 AMPHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP: The Foundation of Many WebsitesApr 13, 2025 am 12:07 AMThe reasons why PHP is the preferred technology stack for many websites include its ease of use, strong community support, and widespread use. 1) Easy to learn and use, suitable for beginners. 2) Have a huge developer community and rich resources. 3) Widely used in WordPress, Drupal and other platforms. 4) Integrate tightly with web servers to simplify development deployment.
Beyond the Hype: Assessing PHP's Role TodayApr 12, 2025 am 12:17 AMPHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.
What are Weak References in PHP and when are they useful?Apr 12, 2025 am 12:13 AMIn PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.
Explain the __invoke magic method in PHP.Apr 12, 2025 am 12:07 AMThe \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.
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mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
