php 图片下载程序

php 图片下载程序

function displayimg($image)
 {
  $image = './upload/'.imgdecode($image);
  //echo $image;exit;
  if (file_exists($image))
  {
   $info = getimagesize($image);
   header("Content-type:$info[mime]");
   switch ($info[2])
   {
    case 1:  $cimage = imagecreatefromgif($image);
       imagegif($cimage);
       imagedestroy($cimage);
       break;
    case 2:  $cimage = imagecreatefromjpeg($image);
       imagejpeg($cimage);
       imagedestroy($cimage);
       break;
    case 3:  $cimage = imagecreatefrompng($image);
       imagepng($cimage);
       imagedestroy($cimage);
       break;
    case 6:  $cimage = imagecreatefromwbmp($image);
       imagewbmp($cimage);
       imagedestroy($cimage);
       break;
   }
   echo $simage;
  }
  else
  {
   header("HTTP/1.0 404 Not Found");
  }
 }

php 验证码生成程序[可自动判断php gd库]
function ShowKey()
{
$key=strtolower(domake_password(4));
$set=esetcookie("checkkey",$key);
 //是否支持gd库
if (function_exists("imagejpeg")) {
   header ("Content-type: image/jpeg");
   $img=imagecreate(69,20);
   $black=imagecolorallocate($img,255,255,255);
   $gray=imagecolorallocate($img,102,102,102);
   imagefill($img,0,0,$gray);
   imagestring($img,3,14,3,$key,$black);
   imagejpeg($img);
   imagedestroy($img);
}
elseif (function_exists("imagegif")) {
   header ("Content-type: image/gif");
   $img=imagecreate(69,20);
   $black=imagecolorallocate($img,255,255,255);
   $gray=imagecolorallocate($img,102,102,102);
   imagefill($img,0,0,$gray);
   imagestring($img,3,14,3,$key,$black);
   imagegif($img);
   imagedestroy($img);
}
elseif (function_exists("imagepng")) {
 header ("Content-type: image/png");
   $img=imagecreate(69,20);
   $black=imagecolorallocate($img,255,255,255);
   $gray=imagecolorallocate($img,102,102,102);
   imagefill($img,0,0,$gray);
   imagestring($img,3,14,3,$key,$black);
   imagepng($img);
   imagedestroy($img);
}
elseif (function_exists("imagewbmp")) {
 header ("Content-type: image/vnd.wap.wbmp");
   $img=imagecreate(69,20);
   $black=imagecolorallocate($img,255,255,255);
   $gray=imagecolorallocate($img,102,102,102);
   imagefill($img,0,0,$gray);
   imagestring($img,3,14,3,$key,$black);
   imagewbmp($img);
   imagedestroy($img);
}
else {
 $set=esetcookie("checkkey","ebak");
 @include("class/functions.php");
 echo ReadFiletext("images/ebak.jpg");
}
}
ShowKey();

php 创建图片教程,我们在编程时经常会看到用php 写图片，验证码等

<?php

$height = 300;

$width = 300;

$im = ImageCreateTrueColor($width, $height);

$white = ImageColorAllocate ($im, 255, 255, 255);

$blue = ImageColorAllocate ($im, 0, 0, 64);

ImageFill($im, 0, 0, $blue);

//ImageLine($im, 0, 0, $width, $height, $white);

ImageString($im, 10, 100, 120, 'Hello,PHP', $white);

Header ('Content-type: image/png');

ImagePng($im);

ImageDestroy($im);

?>

php 图处理函数实例教程, 图片处理，php,图片函数

<?php
//公用函数

//把角度转换为弧度
function deg2Arc($degrees) {
return($degrees * (pi()/180.0));
}

//RGB
function getRGB($color){
  $R=($color>>16) & 0xff;
  $G=($color>>8) & 0xff;
  $B=($color) & 0xff;
  return (array($R,$G,$B));
}

// 取得在椭圆心为（0，0）的椭圆上 x,y点的值
function pie_point($deg,$va,$vb){
$x= cos(deg2Arc($deg)) * $va;
$y= sin(deg2Arc($deg)) * $vb;
return (array($x, $y));
}

//3D饼图类

class chart{

var $a; //椭圆长半轴
var $b; //椭圆短半轴
var $DataArray;  //每个扇形的数据
var $ColorArray; //每个扇形的颜色 要求按照十六进制书写但前面不加0x
//为边缘及阴影为黑色

function chart($pa=100,$pb=60,$sData="100,200,300,400,500,300", $sColor="ee00ff,dd0000,cccccc,ccff00,00ccff,ccff00")
{
    $this->a=$pa;
    $this->b=$pb;
    $this->DataArray=split(",",$sData);
    $this->ColorArray=split(",",$sColor);
}

function setA($v){
    $this->a=$v;
}

function getA(){
    return $this->a;
}

function setB($v){
    $this->b=$v; 
}

function getB(){
    return $this->b;
}

function setDataArray($v){
    $this->DataArray=split(",",$v);
}

function getDataArray($v){
    return $this->DataArray;
}

function setColorArray($v){
    $this->ColorArray=split(",",$v);
}

function getColorArray(){
    return  $this->ColorArray;
}

 
function  DrawPie(){
    $image=imagecreate($this->a*2+40,$this->b*2+40);
    $PieCenterX=$this->a+10;
    $PieCenterY=$this->b+10;
    $DoubleA=$this->a*2;
    $DoubleB=$this->b*2;
    list($R,$G,$B)=getRGB(0);
    $colorBorder=imagecolorallocate($image,$R,$G,$B);
    $DataNumber=count($this->DataArray);
    
    //$DataTotal
    for($i=0;$i<$DataNumber;$i++)      $DataTotal+=$this->DataArray[$i]; //算出数据和
    
    //填充背境
    imagefill($image, 0, 0, imagecolorallocate($image, 0xFF, 0xFF, 0xFF));

    /*
    ** 画每一个扇形
    */
    $Degrees = 0;
    for($i = 0; $i < $DataNumber; $i++){
        $StartDegrees = round($Degrees);
        $Degrees += (($this->DataArray[$i]/$DataTotal)*360);
        $EndDegrees = round($Degrees);
        $percent = number_format($this->DataArray[$i]/$DataTotal*100, 1); 
        list($R,$G,$B)=getRGB(hexdec($this->ColorArray[$i]));
        $CurrentColor=imagecolorallocate($image,$R,$G,$B);
        if ($R>60 and $R<256)            $R=$R-60;
        if ($G>60 and $G<256)            $G=$G-60;
        if ($B>60 and $B<256)            $B=$B-60;
        $CurrentDarkColor=imagecolorallocate($image,$R,$G,$B);
        //画扇形弧
        imagearc($image,$PieCenterX,$PieCenterY,$DoubleA,$DoubleB,$StartDegrees,$EndDegrees,$CurrentColor);
        //画直线
        list($ArcX, $ArcY) = pie_point($StartDegrees , $this->a , $this->b);
        imageline($image,$PieCenterX,$PieCenterY,floor($PieCenterX + $ArcX),floor($PieCenterY + $ArcY),$CurrentColor);
        //画直线
        list($ArcX, $ArcY) = pie_point($EndDegrees,$this->a , $this->b);
        imageline($image,$PieCenterX,$PieCenterY,ceil($PieCenterX + $ArcX),ceil($PieCenterY + $ArcY),$CurrentColor);
        //填充扇形
        $MidPoint = round((($EndDegrees - $StartDegrees)/2) + $StartDegrees);
        list($ArcX, $ArcY) = Pie_point($MidPoint, $this->a*3/4 , $this->b*3/4);
        
        imagefilltoborder($image,floor($PieCenterX + $ArcX),floor($PieCenterY + $ArcY), $CurrentColor,$CurrentColor);
        imagestring($image,2,floor($PieCenterX + $ArcX-5),floor($PieCenterY + $ArcY-5),$percent."%",$colorBorder);

        //画阴影
        if ($StartDegrees>=0 and $StartDegrees<=180){
           if($EndDegrees<=180){    
               for($k = 1; $k < 15; $k++)
                imagearc($image,$PieCenterX, $PieCenterY+$k,$DoubleA, $DoubleB, $StartDegrees, $EndDegrees, $CurrentDarkColor);
           }else{
               for($k = 1; $k < 15; $k++)
                imagearc($image,$PieCenterX, $PieCenterY+$k,$DoubleA, $DoubleB, $StartDegrees, 180, $CurrentDarkColor);
           }

        }
   }
        
    /*到此脚本已经生了一幅图像了
    **现在需要的是把它发到浏览器上，重要的一点是要将标头发给浏览器，让它知道是一个GIF文件。不然的话你只能看到一堆奇怪的乱码
    */ 
    //输出生成的图片    
    header("Content-type: image/gif");
    imagegif($image);
    imagedestroy($image);
}//End drawPie()
}//End class

//实现

$objp = new chart();
$objp->DrawPie();
?> 

php上传图片并生成缩位图代码,我们时常要上传图片,但也要保留自己的版权所以就会用到图片加水印哦,下面的程序就是上传图片成功后再给图片加上你自己做的水印效果哦.

<?php

class Image {
 var $imageResource = NULL;
 var $target = NULL;
 var $enableTypes = array();
 var $imageInfo = array();
 var $createFunc = '';
 var $imageType = NULL;
 
 /**
  * Construct for this class
  *
  * @param string $image
  * @return Image
  */
 function Image($image = NULL) {
  //get enables
  if(imagetypes() & IMG_GIF) {
   $this->enableTypes[] = 'image/gif';
  }
  if(imagetypes() & IMG_JPEG) {
   $this->enableTypes[] = 'image/jpeg';
  }
  if (imagetypes() & IMG_JPG) {
   $this->enableTypes[] = 'image/jpg';
  }
  if(imagetypes() & IMG_PNG) {
   $this->enableTypes[] = 'image/png';
  }
  //end get
  
  if($image != NULL) {
   $this->setImage($image);
  }
 }
 
 /**
  * set a image resource
  *
  * @param string $image
  * @return boolean
  */
 function setImage($image) {
  if(file_exists($image) && is_file($image)) {
   $this->imageInfo = getimagesize($image);
   $img_mime = strtolower($this->imageInfo['mime']);
   if(!in_array($img_mime, $this->enableTypes)) {
    exit('系统不能操作这种图片类型.');
   }
   switch ($img_mime) {
    case 'image/gif':
     $link = imagecreatefromgif($image);
     $this->createFunc = 'imagegif';
     $this->imageType = 'gif';
     break;
    case 'image/jpeg':
    case 'image/jpg':
     $link = imagecreatefromjpeg($image);
     $this->createFunc = 'imagejpeg';
     $this->imageType = 'jpeg';
     break;
    case 'image/png':
     $link = imagecreatefrompng($image);
     $this->createFunc = 'imagepng';
     $this->imageType = 'png';
     break;
    default:
     $link = 'unknow';
     $this->imageType = 'unknow';
     break;
   }
   if($link !== 'unknow') {
    $this->imageResource = $link;
   } else {
    exit('这种图片类型不能改变尺寸.');
   }
   unset($link);
   return true;
  } else {
   return false;
  }
 }
 
 /**
  * set header
  *
  */
 function setHeader() {
  switch ($this->imageType) {
   case 'gif':
    header('content-type:image/gif');
    break;
   case 'jpeg':
    header('content-type:image/jpeg');
    break;
   case 'png':
    header('content-type:image/png');
    break;
   default:
    exit('Can not set header.');
    break;
  }
  return true;
 }
 
 /**
  * change the image size
  *
  * @param int $width
  * @param int $height
  * @return boolean
  */
 function changeSize($width, $height = -1) {
  if(!is_resource($this->imageResource)) {
   exit('不能改变图片的尺寸,可能是你没有设置图片来源.');
  }
  $s_width = $this->imageInfo[0];
  $s_height = $this->imageInfo[1];
  $width = intval($width);
  $height = intval($height);
  
  if($width <= 0) exit('图片宽度必须大于零.');
  if($height <= 0) {
   $height = ($s_height / $s_width) * $width;
  }
  
  $this->target = imagecreatetruecolor($width, $height);
  if(@imagecopyresized($this->target, $this->imageResource, 0, 0, 0, 0, $width, $height, $s_width, $s_height))
   return true;
  else
   return false;
 }
 
 /**
  * Add watermark
  *
  * @param string $image
  * @param int $app
  */
 function addWatermark($image, $app = 50) {
  if(file_exists($image) && is_file($image)) {
   $s_info = getimagesize($image);
  } else {
   exit($image . '文件不存在.');
  }

  $r_width = $s_info[0];
  $r_height = $s_info[1];

  if($r_width > $this->imageInfo[0]) exit('水印图片必须小于目标图片');
  if($r_height > $this->imageInfo[1]) exit('水印图片必须小于目标图片');
  
  switch ($s_info['mime']) {
   case 'image/gif':
    $resource = imagecreatefromgif($image);
    break;
   case 'image/jpeg':
   case 'image/jpg':
    $resource = imagecreatefromjpeg($image);
    break;
   case 'image/png':
    $resource = imagecreatefrompng($image);
    break;
   default:
    exit($s_info['mime'] .'类型不能作为水印来源.');
    break;
  }
  
  $this->target = &$this->imageResource;
  imagecopymerge($this->target, $resource, $this->imageInfo[0] - $r_width - 5, $this->imageInfo[1] - $r_height - 5, 0,0 ,$r_width, $r_height, $app);
  imagedestroy($resource);
  unset($resource);
 }
 
 /**
  * create image
  *
  * @param string $name
  * @return boolean
  */
 function create($name = NULL) {
  $function = $this->createFunc;
  if($this->target != NULL && is_resource($this->target)) {
   if($name != NULL) {
    $function($this->target, $name);
   } else {
    $function($this->target);
   }
   return true;
  } else if($this->imageResource != NULL && is_resource($this->imageResource)) {
   if($name != NULL) {
    $function($this->imageResource, $name);
   } else {
    $function($this->imageResource);
   }
   return true;
  } else {
   exit('不能创建图片,原因可能是没有设置图片来源.');
  }
 }
 
 /**
  * free resource
  *
  */
 function free() {
  if(is_resource($this->imageResource)) {
   @imagedestroy($this->imageResource);
  }
  if(is_resource($this->target)) {
   @imagedestroy($this->target);
  }
 }
}
?>