本文介绍了使用dompdf类库生成PDF文档的方法，重点解决了中文乱码和图片呈现问题。首先通过composer安装dompdf类库并设置中文字体（如SimSun），需执行load_font.php脚本加载字体文件。对于图片显示难题，建议将图片转换为base64格式嵌入HTML。文中详细说明了PDF生成流程：从数据准备、HTML模板构建到PDF渲染输出，并提供了处理中文乱码的具体解

一.导出pdf文件，首先要安装相关的类库文件，我用的是dompdf类库。

 1.安装类库文件：

composer require dompdf/dompdf

2.引入类库文件到你的控制器中，创建方法：

public function generatePdf()
{
//你需要打印的查询内容
$data = ['name' => '烦烦烦','content' => '哈哈哈计划经济','img' => 'https:://www.tupian.com/upload/name.png'];
// 实例化 Dompdf 对象
$options = new Options();
// 重点设置字体
$options->setDefaultFont('SimSun');
$dompdf = new Dompdf($options);
// 设置 HTML 内容
$html = $this->getPdfContent($list); // 自定义获取数据并生成 HTML 的方法
// 加载 HTML 到 Dompdf
$dompdf->loadHtml($html);
$dompdf->setPaper('A4', 'portrait');
// 渲染 PDF
$dompdf->render();
// 输出 PDF 文件到浏览器
$dompdf->stream("/report.pdf", array("Attachment" => true)); // 可以设置为 true 来强制下载
return $this->success('ok');
}
//pdf的html文件
private function getPdfContent($data)
{
// 获取数据并生成 HTML 字符串
//        $data = YourModel::all(); // 替换为你的数据获取逻辑
$html = '';
$html = 'table { width: 100%; border-collapse: collapse; } td, th { border: 1px solid black; padding: 8px; text-align: left; }';
$html .= '记录';
$html .= '';
//        foreach ($data as $row) {
$html .= '';
$html .= "名称{$data->name}"; // 根据你的数据结构调整单元格内容
$html .= "使用内容{$data->content}";
$html .= "图片img}' width='100' height='100'>";
//        }
$html .= '';
return $html;
}

二. 这时候你去访问生成pdf文件，若输出数据为中文，则会显示乱码。需要引用字体库文件。
 1) 新建load_font.php放到项目跟目录，跟verdor同级：

getOptions()->set('fontDir', $fontDir);
}
/**
* Installs a new font family
* This function maps a font-family name to a font.  It tries to locate the
* bold, italic, and bold italic versions of the font as well.  Once the
* files are located, ttf versions of the font are copied to the fonts
* directory.  Changes to the font lookup table are saved to the cache.
*
* @param Dompdf $dompdf      dompdf main object
* @param string $fontname    the font-family name
* @param string $normal      the filename of the normal face font subtype
* @param string $bold        the filename of the bold face font subtype
* @param string $italic      the filename of the italic face font subtype
* @param string $bold_italic the filename of the bold italic face font subtype
*
* @throws Exception
*/
function install_font_family($dompdf, $fontname, $normal, $bold = null, $italic = null, $bold_italic = null) {
$fontMetrics = $dompdf->getFontMetrics();
// Check if the base filename is readable
if ( !is_readable($normal) )
throw new Exception("Unable to read '$normal'.");
$dir = dirname($normal);
$basename = basename($normal);
$last_dot = strrpos($basename, '.');
if ($last_dot !== false) {
$file = substr($basename, 0, $last_dot);
$ext = strtolower(substr($basename, $last_dot));
} else {
$file = $basename;
$ext = '';
}
if ( !in_array($ext, array(".ttf", ".otf")) ) {
throw new Exception("Unable to process fonts of type '$ext'.");
}
// Try $file_Bold.$ext etc.
$path = "$dir/$file";
$patterns = array(
"bold"        => array("_Bold", "b", "B", "bd", "BD"),
"italic"      => array("_Italic", "i", "I"),
"bold_italic" => array("_Bold_Italic", "bi", "BI", "ib", "IB"),
);
foreach ($patterns as $type => $_patterns) {
if ( !isset($$type) || !is_readable($$type) ) {
foreach($_patterns as $_pattern) {
if ( is_readable("$path$_pattern$ext") ) {
$$type = "$path$_pattern$ext";
break;
}
}
if ( is_null($$type) )
echo ("Unable to find $type face file.\n");
}
}
$fonts = compact("normal", "bold", "italic", "bold_italic");
$entry = array();
// Copy the files to the font directory.
foreach ($fonts as $var => $src) {
if ( is_null($src) ) {
$entry[$var] = $dompdf->getOptions()->get('fontDir') . '/' . mb_substr(basename($normal), 0, -4);
continue;
}
// Verify that the fonts exist and are readable
if ( !is_readable($src) )
throw new Exception("Requested font '$src' is not readable");
$dest = $dompdf->getOptions()->get('fontDir') . '/' . basename($src);
if ( !is_writeable(dirname($dest)) )
throw new Exception("Unable to write to destination '$dest'.");
echo "Copying $src to $dest...\n";
if ( !copy($src, $dest) )
throw new Exception("Unable to copy '$src' to '$dest'");
$entry_name = mb_substr($dest, 0, -4);
echo "Generating Adobe Font Metrics for $entry_name...\n";
$font_obj = Font::load($dest);
$font_obj->saveAdobeFontMetrics("$entry_name.ufm");
$font_obj->close();
$entry[$var] = $entry_name;
}
// Store the fonts in the lookup table
$fontMetrics->setFontFamily($fontname, $entry);
// Save the changes
$fontMetrics->saveFontFamilies();
}
// If installing system fonts (may take a long time)
if ( $_SERVER["argv"][1] === "system_fonts" ) {
$fontMetrics = $dompdf->getFontMetrics();
$files = glob("/usr/share/fonts/truetype/*.ttf") +
glob("/usr/share/fonts/truetype/*/*.ttf") +
glob("/usr/share/fonts/truetype/*/*/*.ttf") +
glob("C:\\Windows\\fonts\\*.ttf") +
glob("C:\\WinNT\\fonts\\*.ttf") +
glob("/mnt/c_drive/WINDOWS/Fonts/");
$fonts = array();
foreach ($files as $file) {
$font = Font::load($file);
$records = $font->getData("name", "records");
$type = $fontMetrics->getType($records[2]);
$fonts[mb_strtolower($records[1])][$type] = $file;
$font->close();
}
foreach ( $fonts as $family => $files ) {
echo " >> Installing '$family'... \n";
if ( !isset($files["normal"]) ) {
echo "No 'normal' style font file\n";
}
else {
install_font_family($dompdf, $family, @$files["normal"], @$files["bold"], @$files["italic"], @$files["bold_italic"]);
echo "Done !\n";
}
echo "\n";
}
}
else {
call_user_func_array("install_font_family", array_merge( array($dompdf), array_slice($_SERVER["argv"], 1) ));
}

2）下载simsun.ttf文件放到根目录下：
3）执行命令：

//必须执行，很重要
php load_fount.php "SimSun" SimSun.ttf

4）添加设置字体的引用，如图一：

// 重点设置字体
$options->setDefaultFont('SimSun');

参考文档：php|thinkphp pdf 导出中文乱码 解决办法 #php导出 pdf中文乱码_我自横刀向天笑的技术博客_51CTO博客三.这时候，你想要导出的数据还有图片怎么办

1）将图片转换为base64的格式输出

$image = 'data:image/jpeg;base64,' . base64_encode(file_get_contents($data['img']));

参考文档：php生成pdf图片不显示怎么办-PHP问题-PHP中文网