代码：
]>
* 1、自动验证文件是表单提交的文件还是base64流提交的文件
* 2、验证图片类型是否合法
* 3、验证图片尺寸是否合法
* 4、验证图片大小是否合法
* 5、支持获取图片信息功能
* 6、支持缩放功能
* 7、支持裁剪功能
* 8、支持缩略图功能
*/
class image{
private $file;
private $type;
public $suffix = array();
public $measure = array();
public $size = array();
public $scale = array(
'is_scale'=>0,
'ratio'=>1
);
public $crop = array(
'is_crop'=>0,
'width'=>0,
'height'=>0
);
public $thumb = array(
'is_thumb'=>0,
'width'=>0,
'height'=>0
);
public function __construct($file){
$this->file = $file;
$this->getType();
}
/*
内部方法：获取图片类型
1、多文件
2、单文件
3、base64流文件
*/
private function getType(){
$file = $this->file;
if(is_array($file)){
// 多文件
if(is_array($file['name'])){
$type = 1;
}else{ // 单文件
$type = 2;
}
}else{
$type = 3;
}
$this->type = $type;
}
/*
内部方法：获取图片后缀
@param path 图片路径
@return suffix 后缀名 如：jpg
*/
private function getSuffix($path) {
$file = fopen($path, "rb");
$bin = fread($file, 2); // 只读2字节
fclose($file);
$strInfo = @unpack("C2chars", $bin);
$typeCode = intval($strInfo['chars1'] . $strInfo['chars2']);
$suffix = "unknow";
if($typeCode == 255216){
$suffix = "jpg";
}elseif($typeCode == 7173){
$suffix = "gif";
}elseif($typeCode == 13780){
$suffix = "png";
}elseif($typeCode == 6677){
$suffix = "bmp";
}elseif($typeCode == 7798){
$suffix = "exe";
}elseif($typeCode == 7784){
$suffix = "midi";
}elseif($typeCode == 8297){
$suffix = "rar";
}elseif($typeCode == 7368){
$suffix = "mp3";
}elseif($typeCode == 0){
$suffix = "mp4";
}elseif($typeCode == 8273){
$suffix = "wav";
}
return $suffix;
}
/*
内部方法：保存流文件
@param stream 文件流
@param suffix 后缀
@param dir 保存文件夹
@return path 文件路径
*/
private function uploadBase64($stream,$suffix,$dir) {
if (empty($stream)) return false;
if (preg_match('/^(data:(\s)?(image|img)\/(\w+);base64,)/', $stream, $str)) {
$path = $dir . md5(rand(100000, 999999)) . ".{$suffix}";
if (file_put_contents($path, base64_decode(str_replace($str[1], '', $stream)))) {
return $path;
} else {
return false;
}
} else {
return false;
}
}
/*
校验文件类型是否合法
@return ret true:合法 false:非法
*/
public function checkType(){
$file = $this->file;
$type = $this->type;
$validSuffix = $this->suffix;
$ret = true;
if($type==1){ // 多文件
foreach($file['tmp_name'] as $v){
$suffix = $this->getSuffix($v);
if(!in_array($suffix,$validSuffix)){
$ret = false;
break;
}
}
}elseif($type==2){ // 单文件
$suffix = $this->getSuffix($file['tmp_name']);
if(!in_array($suffix,$validSuffix)){
$ret = false;
}
}else{ // base64文件
$suffix = $this->getSuffix($file);
if(!in_array($suffix,$validSuffix)){
$ret = false;
}
}
return $ret;
}
/*
校验文件尺寸是否合法
@return ret true:合法 false:非法
*/
public function checkMeasure(){
$file = $this->file;
$type = $this->type;
$validMeasure = $this->measure;
$ret = true;
if($type==1){ // 多文件
foreach($file['tmp_name'] as $v){
$measure = getimagesize($v);
$width = $measure[0];
$height = $measure[1];
if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
$ret = false;
break;
}
}
}elseif($type==2){ // 单文件
$measure = getimagesize($file['tmp_name']);
$width = $measure[0];
$height = $measure[1];
if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
$ret = false;
}
}else{ // base64文件
$measure = getimagesize($file);
$width = $measure[0];
$height = $measure[1];
if(($width < $validMeasure['width'][0] || $width > $validMeasure['width'][1]) || ($height < $validMeasure['height'][0] || $height > $validMeasure['height'][1])){
$ret = false;
}
}
return $ret;
}
/*
校验文件大小是否合法
@return ret true:合法 false:非法
*/
public function checkSize(){
$file = $this->file;
$type = $this->type;
$validSize = $this->size;
$ret = true;
if($type==1){ // 多文件
foreach($file['tmp_name'] as $v){
$size = filesize($v);
if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
$ret = false;
break;
}
}
}elseif($type==2){ // 单文件
$size = filesize($file['tmp_name']);
if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
$ret = false;
}
}else{ // base64文件
$info = file_get_contents($file);
$size = strlen($info);
if(($size < $validSize['min']*1024*1024) || ($size > $validSize['max']*1024*1024)){
$ret = false;
}
}
return $ret;
}
/*
@desc：获取图片信息
*/
public function info(){
$file = $this->file;
$type = $this->type;
$ret = array();
if($type==1){ // 多文件
foreach($file['tmp_name'] as $k=>$v){
$measure = getimagesize($v);
$width = $measure[0];
$height = $measure[1];
$size = filesize($v)/1024/1024;
$ret[$k] = array(
'width'=>$width,
'height'=>$height,
'size'=>number_format($size,2)
);
}
}elseif($type==2){ // 单文件
$measure = getimagesize($file['tmp_name']);
$width = $measure[0];
$height = $measure[1];
$size = filesize($file['tmp_name'])/1024/1024;
$ret = array(
'width'=>$width,
'height'=>$height,
'size'=>number_format($size,2)
);
}else{ // base64文件
$measure = getimagesize($file);
$width = $measure[0];
$height = $measure[1];
$info = file_get_contents($file);
$size = strlen($info)/1024/1024;
$ret = array(
'width'=>$width,
'height'=>$height,
'size'=>number_format($size,2)
);
}
return $ret;
}
/*
内部方法：缩放图片
*/
private function scale($path,$suffix,$ratio){
list($width, $height) = getimagesize($path);
$new_w = $ratio * $width;
$new_h = $ratio * $height;
$new_s = imagecreatetruecolor($new_w, $new_h);
if(in_array($suffix,array('jpg','jpeg'))){
$img = imagecreatefromjpeg($path);
}elseif($suffix == 'png'){
$img = imagecreatefrompng($path);
}elseif($suffix == 'gif'){
$img = imagecreatefromgif($path);
}else{
return false;
}
$ret1 = imagecopyresized($new_s, $img, 0, 0, 0, 0, $new_w, $new_h, $width, $height);
if(in_array($suffix,array('jpg','jpeg'))){
$ret2 = imagejpeg($new_s, $path);
}elseif($suffix == 'png'){
$ret2 = imagepng($new_s, $path);
}elseif($suffix == 'gif'){
$ret2 = imagegif($new_s, $path);
}else{
return false;
}
imagedestroy($new_s);
imagedestroy($img);
if($ret1 && $ret2){
return $path;
}else{
return false;
}
}
/*
内部方法：裁剪图片
*/
private function crop($path,$suffix,$cut_width,$cut_height){
$cut_x;
$cut_y;
$min;
$size = getimagesize($path);
$width = $size[0];
$height = $size[1];
$min = min($width,$height);
$cut_width = ($cut_width > $min)?$min:$cut_width;
$cut_height = ($cut_height > $min)?$min:$cut_height;
$cut_x = ($width - $cut_width) / 2;
$cut_y = ($height - $cut_height) / 2;
if(in_array($suffix,array('jpg','jpeg'))){
$img = imagecreatefromjpeg($path);
}elseif($suffix == 'png'){
$img = imagecreatefrompng($path);
}elseif($suffix == 'gif'){
$img = imagecreatefromgif($path);
}else{
return false;
}
$new_s = imagecreatetruecolor($cut_width, $cut_height);
$ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height);
if(in_array($suffix,array('jpg','jpeg'))){
$ret2 = imagejpeg($new_s, $path);
}elseif($suffix == 'png'){
$ret2 = imagepng($new_s, $path);
}elseif($suffix == 'gif'){
$ret2 = imagegif($new_s, $path);
}else{
return false;
}
imagedestroy($new_s);
imagedestroy($img);
if($ret1 && $ret2){
return $path;
}else{
return false;
}
}
/*
内部方法：生成缩略图
*/
private function thumb($path,$suffix,$cut_width,$cut_height){
$cut_x;
$cut_y;
$ratio = 1;
$size = getimagesize($path);
$width = $size[0];
$height = $size[1];
$cw;
$ch;
if($width/$height >= $cut_width/$cut_height){
$ratio = $cut_height / $height;
}else{
$ratio = $cut_width / $width;
}
$path = $this->scale($path,$suffix,$ratio,$path);
$width *= $ratio;
$height *= $ratio;
$cut_x = abs($cut_width - $width) / 2;
$cut_y = abs($cut_height - $height) / 2;
if(in_array($suffix,array('jpg','jpeg'))){
$img = imagecreatefromjpeg($path);
}elseif($suffix == 'png'){
$img = imagecreatefrompng($path);
}elseif($suffix == 'gif'){
$img = imagecreatefromgif($path);
}else{
return false;
}
$new_s = imagecreatetruecolor($cut_width, $cut_height);
$ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height);
if(in_array($suffix,array('jpg','jpeg'))){
$ret2 = imagejpeg($new_s, $path);
}elseif($suffix == 'png'){
$ret2 = imagepng($new_s, $path);
}elseif($suffix == 'gif'){
$ret2 = imagegif($new_s, $path);
}else{
return false;
}
imagedestroy($new_s);
imagedestroy($img);
if($ret1 && $ret2){
return $path;
}else{
return false;
}
}
/*
保存
@param dir 存储的文件夹 如：'./'
@return ret 存储的文件路径 如：'./test.jpg'
*/
public function save($dir){
$file = $this->file;
$type = $this->type;
$scale = $this->scale;
$crop = $this->crop;
$thumb = $this->thumb;
$is_scale = $scale['is_scale'];
$is_crop = $crop['is_crop'];
$is_thumb = $thumb['is_thumb'];
$ratio = $scale['ratio'];
$crop_width = $crop['width'];
$crop_height = $crop['height'];
$thumb_width = $thumb['width'];
$thumb_height = $thumb['height'];
if($type==1){ // 多文件
foreach($file['tmp_name'] as $k=>$v){
$suffix = $this->getSuffix($v);
$name = $dir.md5(rand(100000,999999)).'.'.$suffix;
$flag = file_put_contents($name,file_get_contents($v));
if(!$flag){
$ret = false;
}else{
if($is_scale){
$name = $this->scale($name,$suffix,$ratio);
}
if($is_crop){
$name = $this->crop($name,$suffix,$crop_width,$crop_height);
}
if($is_thumb){
$name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
}
$ret[$k] = $name;
}
}
}elseif($type==2){ // 单文件
$suffix = $this->getSuffix($file['tmp_name']);
$name = $dir.md5(rand(100000,999999)).'.'.$suffix;
$flag = file_put_contents($name,file_get_contents($file['tmp_name']));
if(!$flag){
$ret = false;
}else{
if($is_scale){
$name = $this->scale($name,$suffix,$ratio);
}
if($is_crop){
$name = $this->crop($name,$suffix,$crop_width,$crop_height);
}
if($is_thumb){
$name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
}
$ret = $name;
}
}else{ // base64文件
$suffix = $this->getSuffix($file);
$name = $dir.md5(rand(100000,999999)).'.'.$suffix;
$flag = file_put_contents($name,file_get_contents($file));
if(!$flag){
$ret = false;
}else{
if($is_scale){
$name = $this->scale($name,$suffix,$ratio);
}
if($is_crop){
$name = $this->crop($name,$suffix,$crop_width,$crop_height);
}
if($is_thumb){
$name = $this->thumb($name,$suffix,$thumb_width,$thumb_height);
}
$ret = $name;
}
}
return $ret;
}
}
