本文实例讲述了php图像处理类。分享给大家供大家参考。具体如下：

<?php

/**

* Image 类

*/

class Image {

/**

* @var string $fileName 文件名

* @access private

*/

private $fileName = '';

/**

* @var gd resource $imageResource 原图像

* @access private

*/

private $imageResource = NULL;

/**

* @var int $imageWidth 原图像宽

* @access private

*/

private $imageWidth = NULL;

/**

* @var int $imageHeight 原图像高

* @access private

*/

private $imageHeight = NULL;

/**

* @var int $imageType 原图像类型

* @access private

*/

private $imageType = NULL;

/**

* @var int $imageWidth 原图像宽

* @access private

*/

public $width = NULL;

/**

* @var int $imageHeight 原图像高

* @access private

*/

public $height = NULL;

/**

* @var int $imageType 原图像类型

* @access private

*/

public $type = NULL;

/**

* @var int $newResource 新图像

* @access private

*/

private $newResource = NULL;

/**

* @var int $newResType 新图像类型

* @access private

*/

private $newResType = NULL;

/**

* 构造函数

* @param string $fileName 文件名

*/

public function __construct($fileName = NULL) {

$this->fileName = $fileName;

if ($this->fileName) {

$this->getSrcImageInfo();

}

}

/**

* 取源图像信息

* @access private

* @return void

*/

private function getSrcImageInfo() {

$info = $this->getImageInfo();

$this->imageWidth = $info[0];

$this->imageHeight = $info[1];

$this->imageType = $info[2];

$this->width = $info[0];

$this->height = $info[1];

$this->type = $info[2];

}

/**

* 取图像信息

* @param string $fileName 文件名

* @access private

* @return array

*/

private function getImageInfo($fileName = NULL) {

if ($fileName==NULL) {

$fileName = $this->fileName;

}

$info = getimagesize($fileName);

return $info;

}

/**

* 创建源图像GD 资源

* @access private

* @return void

*/

private function createSrcImage () {

$this->imageResource = $this->createImageFromFile();

}

/**

* 跟据文件创建图像GD 资源

* @param string $fileName 文件名

* @return gd resource

*/

public function createImageFromFile($fileName = NULL)

{

if (!$fileName) {

$fileName = $this->fileName;

$imgType = $this->imageType;

}

if (!is_readable($fileName) || !file_exists($fileName)) {

throw new Exception('Unable to open file "' . $fileName . '"');

}

if (!$imgType) {

$imageInfo = $this->getImageInfo($fileName);

$imgType = $imageInfo[2];

}

switch ($imgType) {

case IMAGETYPE_GIF:

$tempResource = imagecreatefromgif($fileName);

break;

case IMAGETYPE_JPEG:

$tempResource = imagecreatefromjpeg($fileName);

break;

case IMAGETYPE_PNG:

$tempResource = imagecreatefrompng($fileName);

break;

case IMAGETYPE_WBMP:

$tempResource = imagecreatefromwbmp($fileName);

break;

case IMAGETYPE_XBM:

$tempResource = imagecreatefromxbm($fileName);

break;

default:

throw new Exception('Unsupport image type');

}

return $tempResource;

}

/**

* 改变图像大小

* @param int $width 宽

* @param int $height 高

* @param string $flag 一般而言,允许截图则用4,不允许截图则用1; 假设要求一个为4:3比例的图像,则:4=如果太长则自动刪除一部分 0=长宽转换成参数指定的 1=按比例缩放,自动判断太长还是太宽,长宽约束在参数指定内 2=以宽为约束缩放 3=以高为约束缩放

* @param string $bgcolor 如果不为null,则用这个参数指定的颜色作为背景色,并且图像扩充到指定高宽,该参数应该是一个数组;

* @return string

*/

public function resizeImage($width, $height, $flag=1, $bgcolor=null) {

$widthRatio = $width/$this->imageWidth;

$heightRatio = $height/$this->imageHeight;

switch ($flag) {

case 1:

if ($this->imageHeight < $height && $this->imageWidth < $width) {

$endWidth = $this->imageWidth;

$endHeight = $this->imageHeight;

//return;

} elseif (($this->imageHeight * $widthRatio)>$height) {

$endWidth = ceil($this->imageWidth * $heightRatio);

$endHeight = $height;

} else {

$endWidth = $width;

$endHeight = ceil($this->imageHeight * $widthRatio);

}

break;

case 2:

$endWidth = $width;

$endHeight = ceil($this->imageHeight * $widthRatio);

break;

case 3:

$endWidth = ceil($this->imageWidth * $heightRatio);

$endHeight = $height;

break;

case 4:

$endWidth2 = $width;

$endHeight2 = $height;

if ($this->imageHeight < $height && $this->imageWidth < $width) {

$endWidth = $this->imageWidth;

$endHeight = $this->imageHeight;

//return;

} elseif (($this->imageHeight * $widthRatio)<$height) {

$endWidth = ceil($this->imageWidth * $heightRatio);

$endHeight = $height;

} else {

$endWidth = $width;

$endHeight = ceil($this->imageHeight * $widthRatio);

}

break;

default:

$endWidth = $width;

$endHeight = $height;

break;

}

if ($this->imageResource==NULL) {

$this->createSrcImage();

}

if($bgcolor){

$this->newResource = imagecreatetruecolor($width,$height);

$bg=ImageColorAllocate($this->newResource,$bgcolor[0],$bgcolor[1],$bgcolor[2]);

ImageFilledRectangle($this->newResource,0,0,$width,$height,$bg);

$tox=ceil(($width-$endWidth)/2);

$toy=ceil(($height-$endHeight)/2);

if($tox<0) $tox=0;

if($toy<0) $toy=0;

}else if ($flag==4) {

$this->newResource = imagecreatetruecolor($endWidth2,$endHeight2);

}else {

$this->newResource = imagecreatetruecolor($endWidth,$endHeight);

}

$this->newResType = $this->imageType;

imagecopyresampled($this->newResource, $this->imageResource, $tox, $toy, 0, 0, $endWidth, $endHeight,$this->imageWidth,$this->imageHeight);

}

/**

* 给图像加水印

* @param string $waterContent 水印内容可以是图像文件名，也可以是文字

* @param int $pos 位置0-9可以是数组

* @param int $textFont 字体大字，当水印内容是文字时有效

* @param string $textColor 文字颜色，当水印内容是文字时有效

* @return string

*/

public function waterMark($waterContent, $pos = 0, $textFont=5, $textColor="#ffffff") {

$isWaterImage = file_exists($waterContent);

if ($isWaterImage) {

$waterImgRes = $this->createImageFromFile($waterContent);

$waterImgInfo = $this->getImageInfo($waterContent);

$waterWidth = $waterImgInfo[0];

$waterHeight = $waterImgInfo[1];

} else {

$waterText = $waterContent;

//$temp = @imagettfbbox(ceil($textFont*2.5),0,"./cour.ttf",$waterContent);

if ($temp) {

$waterWidth = $temp[2]-$temp[6];

$waterHeight = $temp[3]-$temp[7];

} else {

$waterWidth = 100;

$waterHeight = 12;

}

}

if ($this->imageResource==NULL) {

$this->createSrcImage();

}

switch($pos)

{

case 0://随机

$posX = rand(0,($this->imageWidth - $waterWidth));

$posY = rand(0,($this->imageHeight - $waterHeight));

break;

case 1://1为顶端居左

$posX = 0;

$posY = 0;

break;

case 2://2为顶端居中

$posX = ($this->imageWidth - $waterWidth) / 2;

$posY = 0;

break;

case 3://3为顶端居右

$posX = $this->imageWidth - $waterWidth;

$posY = 0;

break;

case 4://4为中部居左

$posX = 0;

$posY = ($this->imageHeight - $waterHeight) / 2;

break;

case 5://5为中部居中

$posX = ($this->imageWidth - $waterWidth) / 2;

$posY = ($this->imageHeight - $waterHeight) / 2;

break;

case 6://6为中部居右

$posX = $this->imageWidth - $waterWidth;

$posY = ($this->imageHeight - $waterHeight) / 2;

break;

case 7://7为底端居左

$posX = 0;

$posY = $this->imageHeight - $waterHeight;

break;

case 8://8为底端居中

$posX = ($this->imageWidth - $waterWidth) / 2;

$posY = $this->imageHeight - $waterHeight;

break;

case 9://9为底端居右

$posX = $this->imageWidth - $waterWidth-20;

$posY = $this->imageHeight - $waterHeight-10;

break;

default://随机

$posX = rand(0,($this->imageWidth - $waterWidth));

$posY = rand(0,($this->imageHeight - $waterHeight));

break;

}

imagealphablending($this->imageResource, true);

if($isWaterImage) {

imagecopy($this->imageResource, $waterImgRes, $posX, $posY, 0, 0, $waterWidth,$waterHeight);

} else {

$R = hexdec(substr($textColor,1,2));

$G = hexdec(substr($textColor,3,2));

$B = hexdec(substr($textColor,5));

$textColor = imagecolorallocate($this->imageResource, $R, $G, $B);

imagestring ($this->imageResource, $textFont, $posX, $posY, $waterText, $textColor);

}

$this->newResource = $this->imageResource;

$this->newResType = $this->imageType;

}

/**

* 生成验证码图片

* @param int $width 宽

* @param string $height 高

* @param int $length 长度

* @param int $validType 0=数字,1=字母,2=数字加字母

* @param string $textColor 文字颜色

* @param string $backgroundColor 背景颜色

* @return void

*/

public function imageValidate($width, $height, $length = 4, $validType = 1, $textColor = '#000000', $backgroundColor = '#ffffff') {

if ($validType==1) {

$validString = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

$validLength = 52;

} elseif ($validType==2) {

$validString = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

$validLength = 62;

} else {

$validString = '123456789';

$validLength = 9;

}

srand((int)time());

$valid = '';

for ($i=0; $i<$length; $i++) {

$valid .= $validString{rand(0, $validLength-1)};

}

$this->newResource = imagecreate($width,$height);

$bgR = hexdec(substr($backgroundColor,1,2));

$bgG = hexdec(substr($backgroundColor,3,2));

$bgB = hexdec(substr($backgroundColor,5,2));

$backgroundColor = imagecolorallocate($this->newResource, $bgR, $bgG, $bgB);

$tR = hexdec(substr($textColor,1,2));

$tG = hexdec(substr($textColor,3,2));

$tB = hexdec(substr($textColor,5,2));

$textColor = imagecolorallocate($this->newResource, $tR, $tG, $tB);

for ($i=0;$i<strlen($valid);$i++){

imagestring($this->newResource,5,$i*$width/$length+3,2, $valid[$i],$textColor);

}

$this->newResType = IMAGETYPE_JPEG;

return $valid;

}

/**

* 显示输出图像

* @return void

*/

public function display($fileName='', $quality=100) {

$imgType = $this->newResType;

$imageSrc = $this->newResource;

switch ($imgType) {

case IMAGETYPE_GIF:

if ($fileName=='') {

header('Content-type: image/gif');

}

imagegif($imageSrc, $fileName, $quality);

break;

case IMAGETYPE_JPEG:

if ($fileName=='') {

header('Content-type: image/jpeg');

}

imagejpeg($imageSrc, $fileName, $quality);

break;

case IMAGETYPE_PNG:

if ($fileName=='') {

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

imagepng($imageSrc);

} else {

imagepng($imageSrc, $fileName);

}

break;

case IMAGETYPE_WBMP:

if ($fileName=='') {

header('Content-type: image/wbmp');

}

imagewbmp($imageSrc, $fileName, $quality);

break;

case IMAGETYPE_XBM:

if ($fileName=='') {

header('Content-type: image/xbm');

}

imagexbm($imageSrc, $fileName, $quality);

break;

default:

throw new Exception('Unsupport image type');

}

imagedestroy($imageSrc);

}

/**

* 保存图像

* @param int $fileNameType 文件名类型 0使用原文件名，1使用指定的文件名，2在原文件名加上后缀，3产生随机文件名

* @param string $folder 文件夹路径 为空为与原文件相同

* @param string $param 参数$fileNameType为1时为文件名2时为后缀

* @return void

*/

public function save($fileNameType = 0, $folder = NULL, $param = '_miniature') {

if ($folder==NULL) {

$folder = dirname($this->fileName).DIRECTORY_SEPARATOR;

}

$fileExtName = FileSystem::fileExt($this->fileName, true);

$fileBesicName = FileSystem::getBasicName($this->fileName, false);

switch ($fileNameType) {

case 1:

$newFileName = $folder.$param;

break;

case 2:

$newFileName = $folder.$fileBesicName.$param.$fileExtName;

break;

case 3:

$tmp = date('YmdHis');

$fileBesicName = $tmp;

$i = 0;

while (file_exists($folder.$fileBesicName.$fileExtName)) {

$fileBesicName = $tmp.$i;

$i++;

}

$newFileName = $folder.$fileBesicName.$fileExtName;

break;

default:

$newFileName = $this->fileName;

break;

}

$this->display($newFileName);

return $newFileName;

}

}

?>

希望本文所述对大家的php程序设计有所帮助。