生成缩略图保存数据库

<?php
# Constants
define("IMAGE_BASE", './');
define("MAX_WIDTH", 150);
define("MAX_HEIGHT", 150);

# Get image locationstr_replace('..', '', $_SERVER['QUERY_STRING']);
$image_file = 't.jpg';
$image_path = IMAGE_BASE . "$image_file";

# Load image
$img = null;
$ext = strtolower(end(explode('.', $image_path)));
if ($ext == 'jpg' || $ext == 'jpeg') {
     $img = imagecreatefromjpeg($image_path);
} else if ($ext == 'png') {
     $img = @imagecreatefrompng($image_path);
# Only if your version of GD includes GIF support
} else if ($ext == 'gif') {
     $img = @imagecreatefrompng($image_path);
}

# If an image was successfully loaded, test the image for size
if ($img) {

     # Get image size and scale ratio
     $width = imagesx($img);
     $height = imagesy($img);
     $scale = min(MAX_WIDTH/$width, MAX_HEIGHT/$height);

     # If the image is larger than the max shrink it
     if ($scale < 1) {
         $new_width =150; //floor($scale*$width);
         $new_height =150;// floor($scale*$height);

         # Create a new temporary image
         $tmp_img = imagecreatetruecolor($new_width, $new_height);

         # Copy and resize old image into new image
         imagecopyresized($tmp_img, $img, 0, 0, 0, 0,$new_width, $new_height, $width, $height);
         imagedestroy($img);
         $img = $tmp_img;
     }
}

# Create error image if necessary
if (!$img) {
     $img = imagecreate(MAX_WIDTH, MAX_HEIGHT);
     imagecolorallocate($img,0,0,0);
     $c = imagecolorallocate($img,70,70,70 );
     imageline($img,0,0,MAX_WIDTH,MAX_HEIGHT,$c2);
     imageline($img,MAX_WIDTH,0,0,MAX_HEIGHT,$c2);
}

# Display the image
header("Content-type: image/jpeg");
imagejpeg($img);
imagedestroy($img);
?>

先来看看效果图吧:

下面我们来看看php怎么样实现绘图这个功能的.

<?php
/***
  * @project Bar Graph Program
  * @license GPL
  * @package
  * @file GrapBar.php
  * @date 2007-4-3
  * @version 1.0
  * @last modified
 
  * 定义 柱状图（柱形图） 类
  *
  * 注意，使用前请确保字体路径存在并允许访问，如果出错，还要检查在php.ini配置中的open_basedir项，如果没此路径请添加，或在程序中设置包含
  *
  * 智能化的柱状图程序，用于报表等
  *
  ***/
 
define("DEFAULT_FONT_PATH", "c:/windows/fonts/simhei.ttf");
class SingleBar
{
 private $_x;
 private $_y;
 private $_h;
 public $_l = 50;
 private $_w = null;
 private $_srcPoints = array();
 private $_points = array();
 
 public function __construct($x, $y, $h, $l = 50, $w = null)
 {
  $this->_x = $x;
  $this->_y = $y;
  $this->_h = $h;
  $this->_l = $l;
  $this->_w = $w;
  $this->_srcPoints = $this->getSrcPoints();
  $this->_points = $this->getPoints();
 }
 
 public function getSrcPoints()
 {
  return array(
   array($this->_x                 , $this->_y),
   array($this->_x+$this->_l       , $this->_y),
   array($this->_x+(1.35*$this->_l), $this->_y-(0.35*$this->_l)),
   array($this->_x+(0.35*$this->_l), $this->_y-(0.35*$this->_l)),
   array($this->_x                 , $this->_y+$this->_h),
   array($this->_x+$this->_l       , $this->_y+$this->_h),
   array($this->_x+(1.35*$this->_l), $this->_y+$this->_h-(0.35*$this->_l))
  );
 }
 
 public function getPoints()
 {
  $points = array();
  foreach($this->_srcPoints as $key => $val)
  {
   $points[] = $val[0];
   $points[] = $val[1];
  }
  return $points;
 }
 
 public function getTopPoints()
 {
  return array_slice($this->_points, 0, 8); //顶坐标
 }
 
 public function getBelowPoints()
 {
  return array_merge(array_slice($this->_points, 0, 2), array_slice($this->_points, 8, 4), array_slice($this->_points, 2, 2)); //下坐标
 }
 
 public function getRightSidePoints()
 {
  return array_merge(array_slice($this->_points, 2, 2), array_slice($this->_points, 10, 4), array_slice($this->_points, 4, 2)); //右侧坐标
 }
 
 public function draw($image, $topColor, $belowColor, $sideColor, $borderColor = null, $type = 'LEFT')
 {
  if (is_null($borderColor))
  {
   $borderColor = 0xcccccc;
  }
  
  $top_rgb = $this->getRGB($topColor);
  $below_rgb = $this->getRGB($belowColor);
  $side_rgb = $this->getRGB($sideColor);
  $top_color = imagecolorallocate($image, $top_rgb['R'], $top_rgb['G'], $top_rgb['B']);
  $below_color = imagecolorallocate($image, $below_rgb['R'], $below_rgb['G'], $below_rgb['B']);
  $side_color = imagecolorallocate($image, $side_rgb['R'], $side_rgb['G'], $side_rgb['B']);
  
  imagefilledpolygon($image, $this->getTopPoints(), 4, $top_color); //画顶面
  imagepolygon($image, $this->getTopPoints(), 4, $borderColor); //画顶面边线
  
  imagefilledpolygon($image, $this->getBelowPoints(), 4, $below_color); //画下面
  imagepolygon($image, $this->getBelowPoints(), 4, $borderColor); //画下面边线
  
  if ($type == 'LEFT')
  {
   imagefilledpolygon($image, $this->getRightSidePoints(), 4, $side_color); //画右侧面
   imagepolygon($image, $this->getRightSidePoints(), 4, $borderColor); //画侧面边线
  } 
 }
 
 public function getRGB($color)
 {
  $ar = array();
  $color = hexdec($color);
  $ar['R'] = ($color>>16) & 0xff;
  $ar['G'] = ($color>>8) & 0xff;
  $ar['B'] = ($color) & 0xff;
  return $ar;
 }
}

class Bar
{
 private $_W;
 private $_H;
 private $_bgColor = "ffffff";
 private $_barHeights = array();
 private $_barTexts = array();
 private $_barColors = array();
 public $_title;
 public $_paddingTop = 30;
 public $_paddingBottom = 100;
 public $_paddingLeft = 45;
 public $_paddingRight = 2;
 public $_barL = 50;
 public $image;
 
 public function __construct($imgW, $imgH, $barHeights, $barTexts = null, $barColors = null)
 {
  $this->_W = $imgW;
  $this->_H = $imgH;
  $this->_barHeights = $barHeights;
  $this->_barTexts   = $barTexts;
  $this->_barColors  = $barColors;
  $this->_paddingBottom = $this->resetPaddingBottom();
  $this->_H = $this->resetHeight();
  $this->image = imagecreatetruecolor($this->_W, $this->_H);
 }
 
 public function stroke()
 {
  $this->drawBg();
  $this->drawBars();
  $this->drawTitle();
  $this->drawLables();
  ob_start();
  //header("Content-type: image/png");
  //imagepng($this->image);
  header("Content-type: " . image_type_to_mime_type(IMAGETYPE_JPEG));
        imagejpeg($this->image);
  imagedestroy($this->image);
 }
 
 public function drawBg()
 {
  $img_w = $this->_W;
  $img_h = $this->_H;
  $paddingTop    = $this->_paddingTop;
  $paddingBottom = $this->_paddingBottom;
  $paddingLeft   = $this->_paddingLeft;
  $paddingRight  = $this->_paddingRight;
  $rgb = $this->getRGB($this->_bgColor);
  $bg = imagecolorallocate($this->image,$rgb['R'], $rgb['G'], $rgb['B']);
  imagefilledrectangle($this->image, 0, 0, $img_w, $img_h, $bg);
  $side_bg = imagecolorallocatealpha($this->image, 220, 220, 220, 75);
  $side_bg2 = imagecolorallocate($this->image, 220, 220, 220);
  $border_color = imagecolorallocate($this->image, 190, 190, 190);
  $line_color = imagecolorallocate($this->image, 236, 236, 236);
  $dial_color = imagecolorallocate($this->image, 131, 131, 131);
  
  $x1 = $paddingLeft;
  $y1 = $paddingTop;
  $x2 = $img_w - $paddingRight;
  $y2 = $img_h - $paddingBottom;
  imagerectangle($this->image, $x1, $y1, $x2, $y2, $border_color);
  imagefilledpolygon($this->image, array($x1-5,$y1+10, $x1-5,$y2+10,  $x1,$y2,  $x1,$y1), 4, $side_bg);
        imagepolygon($this->image, array($x1-5,$y1+10, $x1-5,$y2+10,  $x1,$y2,  $x1,$y1), 4, $border_color);
  imagefilledpolygon($this->image, array($x1-5,$y2+10, $x2-5,$y2+10,  $x2,$y2,  $x1,$y2), 4, $side_bg);
        imagepolygon($this->image, array($x1-5,$y2+10, $x2-5,$y2+10,  $x2,$y2,  $x1,$y2), 4, $border_color);
  imageline($this->image, $x1, $y2, $x2, $y2, $side_bg2);
  
  $total_h = $img_h - $paddingTop - $paddingBottom;
  $every_h = $total_h/11;
  for($i=1; $i<=10; $i++)
  {
   imageline($this->image, $x1, $y1+($every_h*$i), $x2, $y1+($every_h*$i), $line_color); //画网线
  }
  
  $max_h = max($this->_barHeights);
  for($i=1; $i<=10; $i++)
  {
   $value = $max_h - (($max_h/10)*($i-1));
   $value = strval($value);
   $str_w = strlen($value)*5;
   imageline($this->image, $x1-5-3, $y1+10+($every_h*$i), $x1-3+1, $y1+10+($every_h*$i), $dial_color); //画刻度线
   imagestring($this->image, 3, $x1-5-3-$str_w-1, $y1+10+($every_h*$i)-5, $value, 0x000000);
  }
 }
 
 
 public function drawBars()
 {
  $counts = count($this->_barHeights);
  if (empty($this->_barColors))
  {
   $color = $this->setColor();
   $this->_barColors = array_slice($color, 0, $counts);
   //shuffle($this->_barColors);
  }
  $every_w = ($this->_W - $this->_paddingLeft - $this->_paddingRight)/$counts; //每一段宽
  $barL = $every_w;
  $barL = ($barL > $this->_barL*1.35+6) ? $this->_barL : $barL/1.35 - 6;
  $max_h = max($this->_barHeights);
  $ruler_h = $this->_H - $this->_paddingTop - $this->_paddingBottom; //标尺总高度
  $stander_h = $ruler_h - ($ruler_h/11); //标尺10等分的高度
  $i = 0;
  foreach ($this->_barHeights as $val)
  {
   $h = ($stander_h/$max_h)*$val;
   $x = $this->_paddingLeft + ($every_w*$i) + (($every_w - ($barL*1.35))/2);;
   $y = $this->_H - $this->_paddingBottom + 10 - $h;
   //$t_color = $this->_barColors[$i];
   $b_color = $this->_barColors[$i];
   //$s_color = $this->_barColors[$i];

   
   $rgb = $this->getRGB($this->_barColors[$i]);
   $R = $rgb['R'] * 0.7;
   $G = $rgb['G'] * 0.7;
   $B = $rgb['B'] * 0.7;
   
   $c1 = $R > 0 ? dechex($R) : '00';
   $c2 = $G > 0 ? dechex($G) : '00';
   $c3 = $B > 0 ? dechex($B) : '00';

   $t_color = $b_color;
   $s_color = $c1. $c2 . $c3;

   $SingleBar = new SingleBar($x, $y, $h, $barL);
   $SingleBar->draw($this->image, $t_color, $b_color, $s_color);
   $i++;
  }
 }
 
 public function drawTitle()
 {
  if (empty($this->_title))
  {
   return;
  }
  $font = 5;
  $font_w = imagefontwidth($font);
  $len = strlen($this->_title);
  $x = ($this->_W + $this->_paddingLeft - $this->_paddingRight)/2;
  $x -= ($len*$font_w)/2;
  $y = ($this->_paddingTop - $font_w)/2 + 12;
  //imagestring($this->image, $font, $x, $y, $title, 0x000000);
  imagettftext($this->image, 12, 0, $x, $y, 0x000000, DEFAULT_FONT_PATH, $this->_title);
 }
 
 public function drawLables()
 {
  $x1 = $this->_paddingLeft - 5;
  $y1 = $this->_H - $this->_paddingBottom + 20;
  $x2 = $this->_W - $this->_paddingRight;
  $y2 = $this->_H - 10;
  //imagefilledrectangle($this->image, $x1, $y1, $x2, $y2, 0xffffff);
  imagerectangle($this->image, $x1, $y1, $x2, $y2, 0x000000);
  $space = 5;
  $x = $x1 + 3;
  $y = $y1 + 3;
  foreach ($this->_barTexts as $key => $val)
  {
   $color = $this->_barColors[$key];
   $rgb = $this->getRGB($color);
   $bg = imagecolorallocate($this->image,$rgb['R'], $rgb['G'], $rgb['B']);
   imagefilledrectangle($this->image, $x, $y, $x+12, $y+12, $bg); //绘12*12的矩形
         imagerectangle($this->image, $x, $y, $x+12, $y+12, 0x000000); //绘12*12的矩形框
   imagettftext($this->image, 12, 0, $x+12+3, $y+12, 0x000000, DEFAULT_FONT_PATH, $val);
   $x += 12 + $space + (strlen($val)*8) + $space;
   if ($x + (strlen($val)*8) >= $this->_W - $this->_paddingLeft - $this->_paddingRight)
   {
    $x = $x1 + 3;
    $y = $y + 12 + 3;
   }
  }
 }
 
 public function resetPaddingBottom()
 {
  $ruler_w = $this->_W - $this->_paddingLeft - $this->_paddingRight;
  $label_w = $this->getLableTotalWidth();
  $lines = ceil($label_w / $ruler_w);
  $h = 12 * $lines + (3 * ($lines + 1)) + 30;
  return $h;
 }
 
 public function resetHeight()
 {
  $padding_bottom = $this->resetPaddingBottom();
  if ($this->_H - $padding_bottom < 222)
  {
   return 222 + $padding_bottom;
  }
  return $this->_H;
 }

 
 public function getLableTotalWidth()
 {
  $counts = count($this->_barTexts);
  $space = 5;
  $total_len = 0;
  foreach ($this->_barTexts as $val)
  {
   $total_len += strlen($val);
  }
  
  $tx_w = ($total_len * 9) + ((12 + 3 + $space) * $counts);
  return $tx_w;
 }
 
 public function setBg($color)
 {
  $this->_bgColor = $color;
 }
 
 public function setTitle($title)
 {
  $this->_title = $title;
 }
 
 public function setColor()
 {
  $ar = array('ff', '00', '33', '66', '99', 'cc');
  $color = array();
  for ($i=0; $i<6; $i++)
  {
   for ($j=0; $j<6; $j++)
   {
    for($k=0; $k<6; $k++)
    {
     $color[] = $ar[$i] . $ar[$j] . $ar[$k];
    }
   }
  }
  
  $color2 = array();
  for ($i=1; $i<216; $i += 4)
  {
   $color2[] = $color[$i];
  }

  return $color2;
 }
 
 public function getRGB($color)
 {
  $ar = array();
  $color = hexdec($color);
  $ar['R'] = ($color>>16) & 0xff;
  $ar['G'] = ($color>>8) & 0xff;
  $ar['B'] = ($color) & 0xff;
  return $ar;
 }
}

/***/
$bar = new Bar(500, 300, array(600, 300, 30, 500, 400, 250, 350, 360), array('AAAAA', 'BBBBB', 'CCCCC', 'DDDDD', 'EEEEEE', 'FFFFFF', 'GGGGGGG', 'HHHHHHHHH'));
$bar->setTitle('打造完美柱状图!');
$bar->stroke();
/***/
?>

以前在奥索看见过很多这样的例子，各各方法复杂，请看如下例子实现图形计数器。在网页中使用请用 <script src="http://文件地址"></script>

<?
//存放计数的文本文件
$count="count.txt";
//计数器的位数，假如不填则默认为6位
$wei="";
//图像的URL路径
$tu="/tcount/images";
?>
<?
if ($wei=="") { $wei=6; }
if (!file_exists($count)) { $fp=fopen($count,"w "); fputs($fp,0,100); fclose($fp); }
if ($REMOTE_ADDR!=$ip) {
$fp=fopen($count,"r ");
$cc=fgets($fp,100);
$cc=trim($cc);
if ($cc=="") { $cou=1; }
else { $cou=$cc 1; }
rewind($fp);
fputs($fp,$cou,100);
fclose($fp);
}
setcookie("ip",$REMOTE_ADDR,time() 86400);
$fp=fopen($count,"r ");
$cou=fgets($fp,100);
$cou=trim($cou);
fclose($fp);
$w=strlen($cou);
while($w<$wei) {
$cou="0".$cou;
$w ;
}
$www=strlen($cou);
$i=0;
echo "document.write("<p align=center>");n";
while($i<$www) {
$ym=substr($cou,$i,1);
echo "document.write("<img src=$tu/$ym.gif>");n";
$i ;
}
?>

图片链接广告大概是最为常用的网络广告模式，但是多条广告的动态随机显示可不是那么简单的事情。PHP的文件上传函数提供了在这块468x60像素的区域（网页广告的标准尺寸）实现能够根据权值大小而随机显示广告的解决方案，从而避免了开发FTP程序或是ASP和Perl CAI中需要外挂扩展才能实现此项功能的弊端。

　　本例在PHP4 MySQL Apache for Win9x/2000下调试通过，共包括两部分：用来增加新广告的程序AddNewAd.php3以及显示广告的程序ShowAd.php3，都存放在服务器PHP文件目录下的“test/guanggao/”目录中。在guanggao目录中建立一个存放广告链接图片的子目录“adbanner/”。下面我们按步骤进行分析。

1.首先，建立MySQL数据库:guanggao

　　在Windows环境下，建立一个MySQL空数据库很简单，因为每个数据库都是存在于mysql/data/目录下的一个子目录，所以只要在该目录下新建子目录guanggao就可以了，这时数据库内还没有任何表和数据。

2.建立新增广告程序：AddNewAd.php3

　　设计思路：其中先用表单得到用户的新广告信息；然后用PHP函数copy()将链接图片（banner）文件上传到服务器adbanner目录下；最后将图片文件名、广告网址、说明、加权信息等写入建立的MySQL数据表ad中。该程序代码如下：

　　# AddNewAd.php3

PHP一个最大的优点就是它对新技术的支持非常轻易，这种语言的可扩展性使得开发人员能够很方便地添加新的模块，而且遍布世界的技术团体的支持和众多扩展模块的支持使得PHP已经成为功能最齐全的Web编程语言之 一。目前可得到的扩展模块已经能够使开发人员执行IMAP和POP3操作，可以动态产生图象和Shockwave Flash动画，进行信用卡验证，敏感数据的加密解密，还能够解析XML格式的数据。但这还不是全部，现在，又有一个新的模块可以与PHP进行绑定了，那就是PDFLib扩展模块，它能够让开发人员动态产生PDF（Adobe Portable Document Format）格式的文件，下面就先看看如何在PHP里使用这个模块。

为了能够使PHP具有操作PDF格式文档的能力，你必须先在你的系统里安装PDFLib扩展库，假如你使用的是Lunix系统，你可以从 http://www.pdflib.com/pdflib/index.html下载一个并进行编译，假如你使用的是Windows系统，那就更简单了，只需要下载一个编译好的PDFLib库，然后在PHP的配置文件里把相应的行的注释去掉即可。


extension=php_pdf.dll


假如是动态装载，也可以是参照下面的命令：


dl("php_pdf.dll");


此外，你还必须有一个Adobe Acrobat PDF阅读器，用来浏览PDF格式，假如你没有，你可以从http://www.adobe.com/免费下载。

一旦你做好了前期预备，就可以创建PDF文件了，下面就是一个简单的例子：



<?php

// 创建一个新的PDF文档句柄

$pdf = PDF_new();


// 打开一个文件

PDF_open_file($pdf, "PDFTest.pdf");


// 开始一个新页面(A4)

PDF_begin_page($pdf, 595, 842);


// 得到并使用字体对象

$arial = PDF_findfont($pdf, "Arial", "host", 1);

PDF_setfont($pdf, $arial, 10);


// 输出文字

PDF_show_xy($pdf, "This is an exam of PDF Documents, It is a good Lib,",50, 750);

PDF_show_xy($pdf, "If you like,please try yourself!", 50, 730);


// 结束一页

PDF_end_page($pdf);


// 关闭并保存文件

PDF_close($pdf);

?>



然后保存成PHP文件，在浏览器里进行浏览，PHP就会执行上面的代码，它产生一个新的PDF文件，并保存到指定的位置。

现在我们分析一下什么的代码，要使用PHP创建PDF文件，有四个步骤：1，创建文档句柄；2，注册文档的字体和颜色；3，用PDFLib提供的函数向文件句柄写文字或画图；4，保存文档。