使用PHP+JavaScript将HTML页面转换为图片的实例分享_javascript技巧

<?php
/*
  Dynamic Heading Generator
  By Stewart Rosenberger
  http://www.stewartspeak.com/headings/  
 
  This script generates PNG images of text, written in
  the font/size that you specify. These PNG images are passed
  back to the browser. Optionally, they can be cached for later use. 
  If a cached image is found, a new image will not be generated,
  and the existing copy will be sent to the browser.
 
  Additional documentation on PHP's image handling capabilities can
  be found at http://www.php.com/image/  
*/

$font_file = 'trebuc.ttf' ;//可以做相应的xiuga
$font_size = 23 ;//可以做相应的修改
$font_color = '#000000' ;
$background_color = '#ffffff' ;
$transparent_background = true ;
$cache_images = true ;
$cache_folder = 'cache' ;

/*
 ---------------------------------------------------------------------------
  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
  are familiar with PHP and its image handling capabilities.
 ---------------------------------------------------------------------------
*/
 
$mime_type = 'image/png' ;
$extension = '.png' ;
$send_buffer_size = 4096 ;
 
// check for GD support
if(!function_exists('ImageCreate'))
  fatal_error('Error: Server does not support PHP image generation') ;
 
// clean up text
if(empty($_GET['text']))
  fatal_error('Error: No text specified.') ;
   
$text = $_GET['text'] ;
if(get_magic_quotes_gpc())
  $text = stripslashes($text) ;
$text = javascript_to_html($text) ;
 
// look for cached copy, send if it exists
$hash = md5(basename($font_file) . $font_size . $font_color .
      $background_color . $transparent_background . $text) ;
$cache_filename = $cache_folder . '/' . $hash . $extension ;
if($cache_images && ($file = @fopen($cache_filename,'rb')))
{
  header('Content-type: ' . $mime_type) ;
  while(!feof($file))
    print(($buffer = fread($file,$send_buffer_size))) ;
  fclose($file) ;
  exit ;
}
 
// check font availability
$font_found = is_readable($font_file) ;
if(!$font_found)
{
  fatal_error('Error: The server is missing the specified font.') ;
}
 
// create image
$background_rgb = hex_to_rgb($background_color) ;
$font_rgb = hex_to_rgb($font_color) ;
$dip = get_dip($font_file,$font_size) ;
$box = @ImageTTFBBox($font_size,0,$font_file,$text) ;
$image = @ImageCreate(abs($box[2]-$box[0]),abs($box[5]-$dip)) ;
if(!$image || !$box)
{
  fatal_error('Error: The server could not create this heading image.') ;
}
 
// allocate colors and draw text
$background_color = @ImageColorAllocate($image,$background_rgb['red'],
  $background_rgb['green'],$background_rgb['blue']) ;
$font_color = ImageColorAllocate($image,$font_rgb['red'],
  $font_rgb['green'],$font_rgb['blue']) ;  
ImageTTFText($image,$font_size,0,-$box[0],abs($box[5]-$box[3])-$box[1],
  $font_color,$font_file,$text) ;
 
// set transparency
if($transparent_background)
  ImageColorTransparent($image,$background_color) ;
 
header('Content-type: ' . $mime_type) ;
ImagePNG($image) ;
 
// save copy of image for cache
if($cache_images)
{
  @ImagePNG($image,$cache_filename) ;
}
 
ImageDestroy($image) ;
exit ;
 
 
/*
  try to determine the "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' => '‘'). 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

<?php
//load the popup utils library
//require_once 'include/popup_utils.inc.php';
?>