php使用mpdf实现html转pdf
使用composer安装mpdf，选择适合自己的版本：
https://packagist.org/packages/mpdf/mpdf
手册：
本文使用的mpdf版本：7.0
基本使用：
$mpdf = new Mpdf(); $mpdf->WriteHTML('内容'); //自动分析录入内容字体 不设置会导致乱码 $mpdf->autoScriptToLang = true; $mpdf->autoLangToFont = true; //输出到页面 $mpdf->Output(); //生成文件 $mpdf->Output('生成文件的路径');
页眉页脚：
//html页眉页脚 可以控制更详细的样式 $mpdf->SetHTMLHeader('<div>页眉</div>'); $mpdf->SetHTMLFooter('<div>页脚</div>'); //页眉 $mpdf->SetHeader('页眉'); $mpdf->SetFooter('页脚'); $mpdf->defaultheaderline = 0;//页眉线宽度 $mpdf->defaultfooterline = 0;//页脚线宽度
页码：
//{PAGENO}当前页码 {nb}总页数 $mpdf->SetHTMLFooter('<div>{PAGENO}/{nb}</div>');
水印：
//文字水印 $mpdf->SetWatermarkText('文字水印',0.2);//水印内容 透明度 $mpdf->watermark_font = 'GB';//设置字体 $mpdf->watermarkAngle = '45';//旋转角度 $mpdf->showWatermarkText = true;//开启文字水印
//关于文字水印字体大小 我使用的mpdf版本中，官方好像在调用watermark方法时好像给写死了，如有需要可以搜索watermark方法自己调整 //图片水印 图片路径可以是网络路径 $mpdf->SetWatermarkImage('图片路径',0.4,[100,100],[0,0]);//图片路径 透明度 水印大小 水印位置 $mpdf->showWatermarkImage = true;//开启图片水印
遇到的问题：
1.水印无法平铺，解决办法：
文字水印：
找到 Mpdf.php 中的 watermark 方法，
把 $this->Text($wx, $wy, $texte, $OTLdata, $textvar); 修改为：
//平铺文字水印 $this->Text(-50, 200, $texte, $OTLdata, $textvar); $this->Text(0, 150, $texte, $OTLdata, $textvar); $this->Text(0, 250, $texte, $OTLdata, $textvar); $this->Text(50, 100, $texte, $OTLdata, $textvar); $this->Text(50, 200, $texte, $OTLdata, $textvar); $this->Text(50, 300, $texte, $OTLdata, $textvar); $this->Text(100, 50, $texte, $OTLdata, $textvar); $this->Text(100, 150, $texte, $OTLdata, $textvar); $this->Text(100, 250, $texte, $OTLdata, $textvar); $this->Text(150, 0, $texte, $OTLdata, $textvar); $this->Text(150, 100, $texte, $OTLdata, $textvar); $this->Text(150, 200, $texte, $OTLdata, $textvar); $this->Text(200, 50, $texte, $OTLdata, $textvar); $this->Text(200, 150, $texte, $OTLdata, $textvar); $this->Text(250, 100, $texte, $OTLdata, $textvar);
图片水印：
找到 Mpdf.php 中的 Image 方法，修改的代码标黄了，大概就是位置支持了二维数组，有需要可以自己改，这里仅供参考：
function Image($file, $x, $y, $w = 0, $h = 0, $type = '', $link = '', $paint = true, $constrain = true, $watermark = false, $shownoimg = true, $allowvector = true) { $orig_srcpath = $file; $this->GetFullPath($file); $info = $this->imageProcessor->getImage($file, true, $allowvector, $orig_srcpath); if (!$info && $paint) { $info = $this->imageProcessor->getImage($this->noImageFile); if ($info) { $file = $this->noImageFile; $w = ($info['w'] * (25.4 / $this->dpi)); // 14 x 16px $h = ($info['h'] * (25.4 / $this->dpi)); // 14 x 16px } } if (!$info) { return false; } // Automatic width and height calculation if needed if ($w == 0 and $h == 0) { /* -- IMAGES-WMF -- */ if ($info['type'] == 'wmf') { // WMF units are twips (1/20pt) // divide by 20 to get points // divide by k to get user units $w = abs($info['w']) / (20 * Mpdf::SCALE); $h = abs($info['h']) / (20 * Mpdf::SCALE); } else { /* -- END IMAGES-WMF -- */ if ($info['type'] == 'svg') { // returned SVG units are pts // divide by k to get user units (mm) $w = abs($info['w']) / Mpdf::SCALE; $h = abs($info['h']) / Mpdf::SCALE; } else { // Put image at default image dpi $w = ($info['w'] / Mpdf::SCALE) * (72 / $this->img_dpi); $h = ($info['h'] / Mpdf::SCALE) * (72 / $this->img_dpi); } } } if ($w == 0) { $w = abs($h * $info['w'] / $info['h']); } if ($h == 0) { $h = abs($w * $info['h'] / $info['w']); } /* -- WATERMARK -- */ if ($watermark) { $maxw = $this->w; $maxh = $this->h; // Size = D PF or array if (is_array($this->watermark_size)) { $w = $this->watermark_size[0]; $h = $this->watermark_size[1]; } elseif (!is_string($this->watermark_size)) { $maxw -= $this->watermark_size * 2; $maxh -= $this->watermark_size * 2; $w = $maxw; $h = abs($w * $info['h'] / $info['w']); if ($h > $maxh) { $h = $maxh; $w = abs($h * $info['w'] / $info['h']); } } elseif ($this->watermark_size == 'F') { if ($this->ColActive) { $maxw = $this->w - ($this->DeflMargin + $this->DefrMargin); } else { $maxw = $this->pgwidth; } $maxh = $this->h - ($this->tMargin + $this->bMargin); $w = $maxw; $h = abs($w * $info['h'] / $info['w']); if ($h > $maxh) { $h = $maxh; $w = abs($h * $info['w'] / $info['h']); } } elseif ($this->watermark_size == 'P') { // Default P $w = $maxw; $h = abs($w * $info['h'] / $info['w']); if ($h > $maxh) { $h = $maxh; $w = abs($h * $info['w'] / $info['h']); } } // Automatically resize to maximum dimensions of page if too large if ($w > $maxw) { $w = $maxw; $h = abs($w * $info['h'] / $info['w']); } if ($h > $maxh) { $h = $maxh; $w = abs($h * $info['w'] / $info['h']); } // Position $pos_list = []; $outstring_list = []; if (isset($this->watermark_pos[0]) && is_array($this->watermark_pos[0])) { foreach ($this->watermark_pos as $k => $v) { $pos_list[] = ['x'=>$v[0],'y'=>$v[1]]; } $x = $this->watermark_pos[0]; $y = $this->watermark_pos[1]; } elseif (is_array($this->watermark_pos)) { $x = $this->watermark_pos[0]; $y = $this->watermark_pos[1]; } elseif ($this->watermark_pos == 'F') { // centred on printable area if ($this->ColActive) { // *COLUMNS* if (($this->mirrorMargins) && (($this->page) % 2 == 0)) { $xadj = $this->DeflMargin - $this->DefrMargin; } // *COLUMNS* else { $xadj = 0; } // *COLUMNS* $x = ($this->DeflMargin - $xadj + ($this->w - ($this->DeflMargin + $this->DefrMargin)) / 2) - ($w / 2); // *COLUMNS* } // *COLUMNS* else { // *COLUMNS* $x = ($this->lMargin + ($this->pgwidth) / 2) - ($w / 2); } // *COLUMNS* $y = ($this->tMargin + ($this->h - ($this->tMargin + $this->bMargin)) / 2) - ($h / 2); } else { // default P - centred on whole page $x = ($this->w / 2) - ($w / 2); $y = ($this->h / 2) - ($h / 2); } /* -- IMAGES-WMF -- */ if ($pos_list) { if ($info['type'] == 'wmf') { $sx = $w * Mpdf::SCALE / $info['w']; $sy = -$h * Mpdf::SCALE / $info['h']; foreach ($pos_list as $k => $v) { $outstring_list[] = sprintf('q %.3F 0 0 %.3F %.3F %.3F cm /FO%d Do Q', $sx, $sy, $v['x'] * Mpdf::SCALE - $sx * $info['x'], (($this->h - $v['y']) * Mpdf::SCALE) - $sy * $info['y'], $info['i']); } } else { /* -- END IMAGES-WMF -- */ if ($info['type'] == 'svg') { $sx = $w * Mpdf::SCALE / $info['w']; $sy = -$h * Mpdf::SCALE / $info['h']; foreach ($pos_list as $k => $v) { $outstring_list[] = sprintf('q %.3F 0 0 %.3F %.3F %.3F cm /FO%d Do Q', $sx, $sy, $v['x'] * Mpdf::SCALE - $sx * $info['x'], (($this->h - $v['y']) * Mpdf::SCALE) - $sy * $info['y'], $info['i']); } } else { foreach ($pos_list as $k => $v) { $outstring_list[] = sprintf("q %.3F 0 0 %.3F %.3F %.3F cm /I%d Do Q", $w * Mpdf::SCALE, $h * Mpdf::SCALE, $v['x'] * Mpdf::SCALE, ($this->h - ($v['y'] + $h)) * Mpdf::SCALE, $info['i']); } } } } else { if ($info['type'] == 'wmf') { $sx = $w * Mpdf::SCALE / $info['w']; $sy = -$h * Mpdf::SCALE / $info['h']; $outstring = sprintf('q %.3F 0 0 %.3F %.3F %.3F cm /FO%d Do Q', $sx, $sy, $x * Mpdf::SCALE - $sx * $info['x'], (($this->h - $y) * Mpdf::SCALE) - $sy * $info['y'], $info['i']); } else { /* -- END IMAGES-WMF -- */ if ($info['type'] == 'svg') { $sx = $w * Mpdf::SCALE / $info['w']; $sy = -$h * Mpdf::SCALE / $info['h']; $outstring = sprintf('q %.3F 0 0 %.3F %.3F %.3F cm /FO%d Do Q', $sx, $sy, $x * Mpdf::SCALE - $sx * $info['x'], (($this->h - $y) * Mpdf::SCALE) - $sy * $info['y'], $info['i']); } else { $outstring = sprintf("q %.3F 0 0 %.3F %.3F %.3F cm /I%d Do Q", $w * Mpdf::SCALE, $h * Mpdf::SCALE, $x * Mpdf::SCALE, ($this->h - ($y + $h)) * Mpdf::SCALE, $info['i']); } } } if ($this->watermarkImgBehind) { $outstring = $this->watermarkImgAlpha . "\n" . $outstring . "\n" . $this->SetAlpha(1, 'Normal', true) . "\n"; $this->pages[$this->page] = preg_replace('/(___BACKGROUND___PATTERNS' . $this->uniqstr . ')/', "\n" . $outstring . "\n" . '\\1', $this->pages[$this->page]); } else { if ($outstring_list) { foreach ($outstring_list as $k => $v) { $this->_out($v); } } else { $this->_out($outstring); } } return 0; } // end of IF watermark /* -- END WATERMARK -- */ if ($constrain) { // Automatically resize to maximum dimensions of page if too large if (isset($this->blk[$this->blklvl]['inner_width']) && $this->blk[$this->blklvl]['inner_width']) { $maxw = $this->blk[$this->blklvl]['inner_width']; } else { $maxw = $this->pgwidth; } if ($w > $maxw) { $w = $maxw; $h = abs($w * $info['h'] / $info['w']); } if ($h > $this->h - ($this->tMargin + $this->bMargin + 1)) { // see below - +10 to avoid drawing too close to border of page $h = $this->h - ($this->tMargin + $this->bMargin + 1); if ($this->fullImageHeight) { $h = $this->fullImageHeight; } $w = abs($h * $info['w'] / $info['h']); } // Avoid drawing out of the paper(exceeding width limits). // if ( ($x + $w) > $this->fw ) { if (($x + $w) > $this->w) { $x = $this->lMargin; $y += 5; } $changedpage = false; $oldcolumn = $this->CurrCol; // Avoid drawing out of the page. if ($y + $h > $this->PageBreakTrigger and ! $this->InFooter and $this->AcceptPageBreak()) { $this->AddPage($this->CurOrientation); // Added to correct for OddEven Margins $x = $x + $this->MarginCorrection; $y = $this->tMargin; // mPDF 5.7.3 $changedpage = true; } /* -- COLUMNS -- */ // COLS // COLUMN CHANGE if ($this->CurrCol != $oldcolumn) { $y = $this->y0; $x += $this->ChangeColumn * ($this->ColWidth + $this->ColGap); $this->x += $this->ChangeColumn * ($this->ColWidth + $this->ColGap); } /* -- END COLUMNS -- */ } // end of IF constrain /* -- IMAGES-WMF -- */ if ($info['type'] == 'wmf') { $sx = $w * Mpdf::SCALE / $info['w']; $sy = -$h * Mpdf::SCALE / $info['h']; $outstring = sprintf('q %.3F 0 0 %.3F %.3F %.3F cm /FO%d Do Q', $sx, $sy, $x * Mpdf::SCALE - $sx * $info['x'], (($this->h - $y) * Mpdf::SCALE) - $sy * $info['y'], $info['i']); } else { /* -- END IMAGES-WMF -- */ if ($info['type'] == 'svg') { $sx = $w * Mpdf::SCALE / $info['w']; $sy = -$h * Mpdf::SCALE / $info['h']; $outstring = sprintf('q %.3F 0 0 %.3F %.3F %.3F cm /FO%d Do Q', $sx, $sy, $x * Mpdf::SCALE - $sx * $info['x'], (($this->h - $y) * Mpdf::SCALE) - $sy * $info['y'], $info['i']); } else { $outstring = sprintf("q %.3F 0 0 %.3F %.3F %.3F cm /I%d Do Q", $w * Mpdf::SCALE, $h * Mpdf::SCALE, $x * Mpdf::SCALE, ($this->h - ($y + $h)) * Mpdf::SCALE, $info['i']); } } if ($paint) { $this->_out($outstring); if ($link) { $this->Link($x, $y, $w, $h, $link); } // Avoid writing text on top of the image. // THIS WAS OUTSIDE THE if ($paint) bit!!!!!!!!!!!!!!!! $this->y = $y + $h; } // Return width-height array $sizesarray['WIDTH'] = $w; $sizesarray['HEIGHT'] = $h; $sizesarray['X'] = $x; // Position before painting image $sizesarray['Y'] = $y; // Position before painting image $sizesarray['OUTPUT'] = $outstring; $sizesarray['IMAGE_ID'] = $info['i']; $sizesarray['itype'] = $info['type']; $sizesarray['set-dpi'] = (isset($info['set-dpi']) ? $info['set-dpi'] : 0); return $sizesarray; }
2.生成的pdf是“非标准格式”，解决办法：
$mpdf->useAdobeCJK = true; $mpdf->autoScriptToLang = true; $mpdf->autoLangToFont = true;
3.不支持元素display属性变化，不支持position定位
4.一个只包含中文符号的html标签（并非中文文字乱码），中文符号会变成乱码，我这里换成了7.1以上的版本，并且 new Mpdf(['mode' => 'zh-cn']) 设置了'mode' => 'zh-cn'，解决了这个问题
更多使用方法请到使用手册查询
