今天无意中浏览网面的时候发现一个长微博,它可以将文本转成png图片,于是乎就研究一下PHP文本转图片的方式,其实只要是用到了PHP的扩展库,GD库来生成图片,再通过图像函数生成,代码写出来后,发现如果文字太多了,图片就会超过屏幕的宽度,导致浏览器右拉条的出现,于是,想想有没有什么办法可以使图片能够自动换行,通过GG,发现了一篇文章,通过判断字符串和截取字符串再拼接起来实现文本图片自动换行,以下贴出此代码,以学习之中:
header ("Content-type: image/png");
mb_internal_encoding("UTF-8"); // 设置编码
function autowrap($fontsize, $angle, $fontface, $string, $width) {
// 这几个变量分别是 字体大小, 角度, 字体名称, 字符串, 预设宽度
$content = "";
// 将字符串拆分成一个个单字 保存到数组 letter 中
for ($i=0;$i
}
foreach ($letter as $l) {
$teststr = $content." ".$l;
$testbox = imagettfbbox($fontsize, $angle, $fontface, $teststr);
// 判断拼接后的字符串是否超过预设的宽度
if (($testbox[2] > $width) && ($content !== "")) {
$content .= "\n";
}
$content .= $l;
}
return $content;
}
$bg = imagecreatetruecolor(300, 290); // 创建画布
$white = imagecolorallocate($bg, 255, 255, 255); // 创建白色
$text = "前段时间练习使用 PHP 的 GD 库时,为了文本的自动换行纠结了很久。虽然可以通过插入 \n 实现换行,但考虑到文本中既有中文又有英文,强制限定每多少个文字就换行的效果很差。后来终于找到了一个英文下的自动换行的方法,其大概原理是将空格作为分隔符,将字符串分割为一个个单词,然后再一个接一个地拼接在一起,判断其长度是否超过画布,若超过则换行再拼接,否则继续拼接。考虑到中文需要将每个文字都拆开,所以我进行了一点修改,完整代码如下。";
$text = autowrap(12, 0, "simsun.ttc", $text, 280); // 自动换行处理
// 若文件编码为 GB2312 请将下行的注释去掉
// $text = iconv("GB2312", "UTF-8", $text);
imagettftext($bg, 12, 0, 10, 30, $white, "simsun.ttc", $text);
imagepng($bg);
imagedestroy($bg);
?>

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

PHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.

PHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.

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.


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