使用PHP+JavaScript将HTML页面转换为图片的实例分享

function com_stewartspeak_replacement() {
/*
  Dynamic Heading Generator
  By Stewart Rosenberger
  http://www.stewartspeak.com/headings/
 
  This script searches through a web page for specific or general elements
  and replaces them with dynamically generated images, in conjunction with
  a server-side script.
*/

replaceSelector("h1","dynatext/heading.php",true);//前两个参数需要修改
var testURL = "dynatext/loading.gif" ;//修改为对应的图片路径
 
var doNotPrintImages = false;
var printerCSS = "replacement-print.css";
 
var hideFlicker = false;
var hideFlickerCSS = "replacement-screen.css";
var hideFlickerTimeout = 100;//这里可以做相应的修改

/* ---------------------------------------------------------------------------
  For basic usage, you should not need to edit anything below this comment.
  If you need to further customize this script's abilities, make sure
  you're familiar with Javascript. And grab a soda or something.
*/
 
var items;
var imageLoaded = false;
var documentLoaded = false;
 
function replaceSelector(selector,url,wordwrap)
{
  if(typeof items == "undefined")
    items = new Array();
 
  items[items.length] = {selector: selector, url: url, wordwrap: wordwrap};
}
 
if(hideFlicker)
{    
  document.write('<link id="hide-flicker" rel="stylesheet" media="screen" href="' + hideFlickerCSS + '" />');    
  window.flickerCheck = function()
  {
    if(!imageLoaded)
      setStyleSheetState('hide-flicker',false);
  };
  setTimeout('window.flickerCheck();',hideFlickerTimeout)
}
 
if(doNotPrintImages)
  document.write('<link id="print-text" rel="stylesheet" media="print" href="' + printerCSS + '" />');
 
var test = new Image();
test.onload = function() { imageLoaded = true; if(documentLoaded) replacement(); };
test.src = testURL + "" + (new Date()).getTime();
 
addLoadHandler(function(){ documentLoaded = true; if(imageLoaded) replacement(); });
 
 
function documentLoad()
{
  documentLoaded = true;
  if(imageLoaded)
    replacement();
}
 
function replacement()
{
  for(var i=0;i<items.length;i++)
  {
    var elements = getElementsBySelector(items[i].selector);
    if(elements.length > 0) for(var j=0;j<elements.length;j++)
    {
      if(!elements[j])
        continue ;
     
      var text = extractText(elements[j]);
      while(elements[j].hasChildNodes())
        elements[j].removeChild(elements[j].firstChild);
 
      var tokens = items[i].wordwrap ""+escape(tokens[k]+' ')+"&selector="+escape(items[i].selector);
        var image = document.createElement("img");
        image.className = "replacement";
        image.alt = tokens[k] ;
        image.src = url;
        elements[j].appendChild(image);
      }
 
      if(doNotPrintImages)
      {
        var span = document.createElement("span");
        span.style.display = 'none';
        span.className = "print-text";
        span.appendChild(document.createTextNode(text));
        elements[j].appendChild(span);
      }
    }
  }
 
  if(hideFlicker)
    setStyleSheetState('hide-flicker',false);
}
 
function addLoadHandler(handler)
{
  if(window.addEventListener)
  {
    window.addEventListener("load",handler,false);
  }
  else if(window.attachEvent)
  {
    window.attachEvent("onload",handler);
  }
  else if(window.onload)
  {
    var oldHandler = window.onload;
    window.onload = function piggyback()
    {
      oldHandler();
      handler();
    };
  }
  else
  {
    window.onload = handler;
  }
}
 
function setStyleSheetState(id,enabled) 
{
  var sheet = document.getElementById(id);
  if(sheet)
    sheet.disabled = (!enabled);
}
 
function extractText(element)
{
  if(typeof element == "string")
    return element;
  else if(typeof element == "undefined")
    return element;
  else if(element.innerText)
    return element.innerText;
 
  var text = "";
  var kids = element.childNodes;
  for(var i=0;i<kids.length;i++)
  {
    if(kids[i].nodeType == 1)
    text += extractText(kids[i]);
    else if(kids[i].nodeType == 3)
    text += kids[i].nodeValue;
  }
 
  return text;
}
 
/*
  Finds elements on page that match a given CSS selector rule. Some
  complicated rules are not compatible.
  Based on Simon Willison's excellent "getElementsBySelector" function.
  Original code (with comments and description):
    http://simon.incutio.com/archive/2003/03/25/getElementsBySelector
*/
function getElementsBySelector(selector)
{
  var tokens = selector.split(' ');
  var currentContext = new Array(document);
  for(var i=0;i<tokens.length;i++)
  {
    token = tokens[i].replace(/^\s+/,'').replace(/\s+$/,'');
    if(token.indexOf('#') > -1)
    {
      var bits = token.split('#');
      var tagName = bits[0];
      var id = bits[1];
      var element = document.getElementById(id);
      if(tagName && element.nodeName.toLowerCase() != tagName)
        return new Array();
      currentContext = new Array(element);
      continue;
    }
 
    if(token.indexOf('.') > -1)
    {
      var bits = token.split('.');
      var tagName = bits[0];
      var className = bits[1];
      if(!tagName)
        tagName = '*';
 
      var found = new Array;
      var foundCount = 0;
      for(var h=0;h<currentContext.length;h++)
      {
        var elements;
        if(tagName == '*')
          elements = currentContext[h].all ""]*)""htmlcode">

<"dip" (pixels dropped below baseline) of this
  font for this size.
*/
function get_dip($font,$size)
{
  $test_chars = 'abcdefghijklmnopqrstuvwxyz' .
         'ABCDEFGHIJKLMNOPQRSTUVWXYZ' .
         '1234567890' .
         '!@#$%^&*()\'"\\/;.,`~<>[]{}-+_-=' ;
  $box = @ImageTTFBBox($size,0,$font,$test_chars) ;
  return $box[3] ;
}
 
 
/*
  attempt to create an image containing the error message given. 
  if this works, the image is sent to the browser. if not, an error
  is logged, and passed back to the browser as a 500 code instead.
*/
function fatal_error($message)
{
  // send an image
  if(function_exists('ImageCreate'))
  {
    $width = ImageFontWidth(5) * strlen($message) + 10 ;
    $height = ImageFontHeight(5) + 10 ;
    if($image = ImageCreate($width,$height))
    {
      $background = ImageColorAllocate($image,255,255,255) ;
      $text_color = ImageColorAllocate($image,0,0,0) ;
      ImageString($image,5,5,5,$message,$text_color) ;  
      header('Content-type: image/png') ;
      ImagePNG($image) ;
      ImageDestroy($image) ;
      exit ;
    }
  }
 
  // send 500 code
  header("HTTP/1.0 500 Internal Server Error") ;
  print($message) ;
  exit ;
}
 
 
/* 
  decode an HTML hex-code into an array of R,G, and B values.
  accepts these formats: (case insensitive) #ffffff, ffffff, #fff, fff 
*/  
function hex_to_rgb($hex)
{
  // remove '#'
  if(substr($hex,0,1) == '#')
    $hex = substr($hex,1) ;
 
  // expand short form ('fff') color
  if(strlen($hex) == 3)
  {
    $hex = substr($hex,0,1) . substr($hex,0,1) .
        substr($hex,1,1) . substr($hex,1,1) .
        substr($hex,2,1) . substr($hex,2,1) ;
  }
 
  if(strlen($hex) != 6)
    fatal_error('Error: Invalid color "'.$hex.'"') ;
 
  // convert
  $rgb['red'] = hexdec(substr($hex,0,2)) ;
  $rgb['green'] = hexdec(substr($hex,2,2)) ;
  $rgb['blue'] = hexdec(substr($hex,4,2)) ;
 
  return $rgb ;
}
 
 
/*
  convert embedded, javascript unicode characters into embedded HTML
  entities. (e.g. '%u2018' => '&#8216;'). returns the converted string.
*/
function javascript_to_html($text)
{
  $matches = null ;
  preg_match_all('/%u([0-9A-F]{4})/i',$text,$matches) ;
  if(!empty($matches)) for($i=0;$i<sizeof($matches[0]);$i++)
    $text = str_replace($matches[0][$i],
              '&#'.hexdec($matches[1][$i]).';',$text) ;
 
  return $text ;
}
 
"htmlcode">

<"-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html>
  <head>
    <title>
      Professional Search Engine Optimization with PHP: Table of Contents
    </title>
    <script type="text/javascript" language="javascript" src="/UploadFiles/2021-04-02/replacement.js">

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