How PHP turns HTML into an image method introduction

The following small series for everyone to bring a PHP to the image of the implementation method. Small series feel very good, now share to everyone, also for everyone to make a reference. Let's take a look at it with a little knitting.

The server-side parsing transforms the compiled HTML into a picture.

Because HTML is typically parsed by the client browser, the server side cannot parse the HTML code directly. So we need to do this with PHP class libraries and extensions.

The file conversion process is html-> pdf->png.

The class library to use is Mpdf, Imagick

PDF official Download address is: http://www.mpdf1.com/mpdf/index.php (recommended under 6.0 although Big Point) this is a class library direct download upload to the server can, there are a lot of things, a new Html2pdf folder introduced

Include ('./html2pdf/mpdf ');

The whole of a function

/* Name  HTML conversion to PDF picture feature converts an  HTML page to a PDF image (some CSS styles are not recognized) number of Parameters 2 1. The HTML code is required to get 2 with File_get_contenth. Generate PDF Storage location path 3. Non-required PDF width 4. Non-mandatory PDF high return value picture name Instance  code ($html, ' img/1.pdf '); * */function html2pdf ($html, $PATH, $w =414, $h = 736) {//Set the Chinese font (it is important that it affects the image generation in the second step) $mpdf =new mpdf (' utf-8 '); $mpdf->autoscripttolang = true; $mpdf->autolangtofont = true;//Sets the size of the PDF $mpdf->writehtml (' <pagebreak sheet-size= '. $w. ' mm '. $h. ' mm '/> ');//Set PDF display mode $mpdf-> Setdisplaymode (' fullpage ');//delete the first page of the PDF (due to the size of the PDF, which results in one more page) $mpdf->deletepages, $mpdf->writehtml ($html); Pdf_name = MD5 (Time ()). PDF '; $mpdf->output ($PATH. $pdf _name); return $pdf _name;}

With this function basically can solve the problem of HTML to PDF, it is important to note that Mpdf does not effectively recognize all CSS styles in HTML, such as position Border-radius. Position can be resolved with margin, you need to display the fillet picture, you need to cut the picture into a circle.

The next step is to convert the PDF to a PNG image. You need to install the ImageMagick component on the server once to run the command

Yum install-y imagemagickyum install-y imagemagick-develyum install-y gccyum install-y php-pearyum install-y GHOSTSCR Iptyum install-y ghostscript-devel.x86_64

Take note of this step to run

Yum List |grep Imagick

Choose to install based on your server version according to the query results I'm 5.6.3.

Yum install-y Php56w-pecl-imagick.x86_64yum install-y php56w-pecl-imagick-devel.x86_64

Restarting the server

Service Nginx Restartservice php-fpm restart

Use Phpinfo () or run Php-m | grep Imagick to see if the installation was successful

You can then use the function to convert the generated PDF to PNG.

/* Name  PDF convert to PNG picture function  convert pdf picture to png picture parameter number 2 1. The HTML code must be available with File_get_contenth for 2. You must generate a PDF storage location path Instance  code ($ HTML, ' img/1.pdf '); * */function pdf2png ($PDF, $PNG, $w =50, $h =50) {if (!extension_loaded (' Imagick ')) {return false;} if (!file_exists ($PDF)) {return false;} $im = new Imagick (); $im->setresolution ($w, $h); Set the resolution $im->setcompressionquality (15);//Set the quality of picture compression $im->readimage ($PDF); $im-Resetiterator (); $imgs = $im- >appendimages (True), $imgs->setimageformat ("png"), $img _name = $PNG; $imgs->writeimage ($img _name); $imgs- >clear (); $imgs->destroy (); $im->clear (); $im->destroy (); return $img _name;}

OK, basically complete the simple picture of the page. The image size is about 1M. It's too small to be clear.