本篇文章主要介绍php操作图片的大小修改、加水印、生成验证码、输出及保存，感兴趣的朋友参考下，希望对大家有所帮助。
具体如下：
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;$inewResource,5,$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;
}
}
?> 总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。
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