js无刷新上传图片，服务端有生成缩略图，剪切图片，iphone图片旋转判断功能

html：

<form action="<{:AppLink('circle/uploadimg')}>" id="imageform" method="post" enctype="multipart/form-data">
<input name="photoimg" type="file" id="xwzx_f" style="display: none;" />
</form>

js:

<script src = "__TMPL__statics/js/jquery-1.7.1.min.js?v=20161123" ></script>
<script src="__TMPL__statics/js/layer/layer.js?v=20161123"></script>
<script src = "__TMPL__statics/js/jquery.form.js?v=1"></script>

$("#xwzx_f").change(function(){
$(".loading-gif").show();
var img_name=this["files"][0]["name"];
var temparr=img_name.split('.');
var ext=temparr.pop().toLowerCase();
temparr=null;
if(ext!="jpg"&&ext!="png"&&ext!="gif"&&ext!="bmp"&&ext!="jpeg"&&ext!="jepg"){
layer.msg('上传的格式不正确');
$(".loading-gif").hide();
return false;
}
var src = window.URL.createObjectURL(this["files"][0]);//如果预览可用此代码

$('#imageform').ajaxSubmit({
beforeSend: function() {
$(".loading-gif").html( '0%');

},
uploadProgress: function(event, position, total, percentComplete) {
$(".loading-gif").html(percentComplete + '%');
},
success: function() {
$(".loading-gif").hide();
},
complete: function(xhr) {
var result=JSON.parse(xhr.responseText);
if(result.status=="success"){
var htmlstr="";
htmlstr='<li class="l_up_img"><div class="f-img-box">';
htmlstr+='<a href="javascript:;"><img src="__ROOT__/attachs/qz/'+result.imgpath+'"></a>';
htmlstr+='<input class="up_img" type="hidden" value="'+result.imgpath+'" bmw="'+result.bm_w+'" bmh="'+result.bm_h+'"/>';
htmlstr+='</div></li>';
$(".f-s-img").find("li").last().before(htmlstr);
}else{
layer.msg(result.msg);
}
}
});

php代码（携带生成大中小缩略图，剪切功能，iphone图片旋转，iphone旋转需要php.ini开启php_exif）

function imgturn($src, $direction = 1,$ext) {
switch ($ext) {
case 'gif' :
$img = imagecreatefromgif ( $src );
break;
case 'jepg':
case 'jpg' :
case 'jpeg' :
$img = imagecreatefromjpeg ( $src );
break;
case 'png' :
$img = imagecreatefrompng ( $src );
break;
default :
die ( '图片格式错误!' );
break;
}
$width = imagesx ( $img );
$height = imagesy ( $img );
$img2 = imagecreatetruecolor ( $height, $width );
// 顺时针旋转90度
if ($direction == 1) {
for($x = 0; $x < $width; $x ++) {
for($y = 0; $y < $height; $y ++) {
imagecopy ( $img2, $img, $height - 1 - $y, $x, $x, $y, 1, 1 );
}
}
} else if ($direction == 2) {
// 逆时针旋转90度
for($x = 0; $x < $height; $x ++) {
for($y = 0; $y < $width; $y ++) {
imagecopy ( $img2, $img, $x, $y, $width - 1 - $y, $x, 1, 1 );
}
}
}
switch ($ext) {
case 'jepg':
case 'jpg' :
case "jpeg" :
imagejpeg ( $img2, $src, 100 );
break;

case "gif" :
imagegif ( $img2, $src, 100 );
break;

case "png" :
imagepng ( $img2, $src, 100 );
break;

default :
die ( '图片格式错误!' );
break;
}
imagedestroy ( $img );
imagedestroy ( $img2 );
}

/**
* 上传图片
*/
public function uploadimg(){
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST"){
$name = $_FILES['photoimg']['name'];
$size = $_FILES['photoimg']['size'];

try {
$filetemp=date('Ymd',time());
$path = BASE_PATH."/attachs/qz/{$filetemp}/";//需要上传的路径
if(!is_dir($path)){
mkdir($path,0777,true);
}
} catch (Exception $e) {
die(json_encode(array('status'=>'error','msg'=>'文件路径创建失败')));
}

if(empty($name)){
die(json_encode(array('status'=>'error','msg'=>'请选择要上传的图片')));
}

if($size>(1024*1024*10)){
die(json_encode(array('status'=>'error','msg'=>'图片大小不能超过10M')));
}

$extend = pathinfo($name);
$ext = strtolower($extend["extension"]);

if(!in_array($ext, array('jpg','png','gif','bmp','jpeg','jepg'))){
die(json_encode(array('status'=>'error','msg'=>'图片格式不正确'.$ext)));
}

$image_name = time().rand(100,999).".".$ext;
$tmp = $_FILES['photoimg']['tmp_name'];

/**
*iphone判断图片方向，是否需要旋转图片
*/
if(strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone')&&in_array($ext, array('jpg','png','gif','jpeg','jepg'))){
$exif =exif_read_data($tmp);
switch ($exif['Orientation']){
case 6:
self::imgturn($tmp,1,$ext);
break;
case 3:
self::imgturn($tmp,1,$ext);
self::imgturn($tmp,1,$ext);
break;
case 8:
self::imgturn($tmp,2,$ext);
break;
}
}

self::imagecropper($tmp, $path,$image_name, 'sm_', 150, 150);//小图，如果图片尺寸不合适就裁剪
self::imagecropper($tmp,$path,$image_name,'mm_',256,256);//中图，如果图片尺寸不合适就裁剪

if($result=move_uploaded_file($tmp, $path.$image_name)){

/**
* 修改，大图
*/
$imagesize=getimagesize($path.$image_name);//高，宽，格式，高宽字符串
if($imagesize[1]>700){//宽度大于720
self::thumb($path,$image_name,'bm_',700,700*$imagesize[1]/$imagesize[0]);//高度等比
}else{
self::thumb($path,$image_name,'bm_',$imagesize[0],$imagesize[1]);
}
/**
* 修改end
*/

/**
*生成缩略图
*小图 92*92
*中图 256*256
*大图 暂时不生成但预留
*/
/* self::thumb( $path,$image_name,'sm_',92,92);
self::thumb( $path,$image_name,'mm_',256,256);
$imagesize=getimagesize($path.$image_name);//高，宽，格式，高宽字符串
if($imagesize[1]>720){//宽度大于720
self::thumb( $path,$image_name,'bm_',720,720*$imagesize[1]/$imagesize[0]);//高度等比
}else{
self::thumb( $path,$image_name,'bm_',$imagesize[0],$imagesize[1]);
} */
unlink($path.$image_name);
$filetemp=date('Ymd',time());
$r_data=array(
//'oror'=>$exif['Orientation'],
'status'=>'success',
'msg'=>'上传成功',
'imgpath'=>$filetemp.'/sm_'.$image_name,
'bm_w'=>$imagesize[0], //大图宽
'bm_h'=>$imagesize[1] //大图高
);

/* $myfile = fopen("C:/Users/sss/Desktop/ss/testfile.txt", "w+");
fwrite($myfile, json_encode($r_data));
fclose($myfile); */

echo json_encode($r_data);
}else{
echo json_encode(array('status'=>'error','msg'=>'上传失败','oror'=>$result));
}
}else{
die(json_encode(array('status'=>'error','msg'=>'请求方式不正确')));
}
}

/**
* 创建图片缩略图
* @param string $directroy 上传至目录,
* @param string $doUpFile 上传的文件名,
* @param string $dscChar 前缀，小图 sm，中图 mm ，大图 bm
* @param number $width
* @param number $height
* @return string|boolean
*/
function thumb( $Directroy,$doUpFile,$dscChar = 'sm_',$width = 92, $height = 92){
if ($doUpFile != '') {
$srcFile = $doUpFile;
$dscFile = $Directroy . $dscChar . $srcFile;
$data = getimagesize($Directroy . $srcFile); // 文件格式，其值 1 为 GIF 格式、 2 为 JPEG/JPG 格式、3 为 PNG 格式。
switch ($data[2]) {
case 1:
$im = @imagecreatefromgif($Directroy . $srcFile);
break;
case 2:
$im = @imagecreatefromjpeg($Directroy . $srcFile);
break;
case 3:
$im = @imagecreatefrompng($Directroy . $srcFile);
break;
}
$srcW = imagesx($im);
$srcH = imagesy($im);
$ni = imagecreatetruecolor($width, $height);
//imagecopyresized($ni, $im, 0, 0, 0, 0, $width, $height, $srcW, $srcH);
imagecopyresampled($ni, $im, 0, 0, 0, 0, $width, $height, $srcW, $srcH);
$cr = imagejpeg($ni, $dscFile);
chmod($dscFile, 0777);
if ($cr) {
return $dscFile;
} else {
return false;
}
}
}

/**
*
* @param unknown $source_path 源图路径
* $Directroy,
* $doUpFile,
* $dscChar = 'sm_',
* @param unknown $target_width 目标图宽度
* @param unknown $target_height 目标图高度
* @return boolean
*
*/
function imagecropper($source_path, $Directroy,$doUpFile, $dscChar = 'sm_', $target_width=92, $target_height=92){
$srcFile = $doUpFile;
$dscFile = $Directroy . $dscChar . $srcFile;

$source_info = getimagesize($source_path);
$source_width = $source_info[0];
$source_height = $source_info[1];
$source_mime = $source_info['mime'];

$source_ratio = $source_height / $source_width;
$target_ratio = $target_height / $target_width;

if ($source_ratio > $target_ratio){ // 源图过高
$cropped_width = $source_width;
$cropped_height = $source_width * $target_ratio;
$source_x = 0;
$source_y = ($source_height - $cropped_height) / 2;
} elseif ($source_ratio < $target_ratio){ // 源图过宽
$cropped_width = $source_height / $target_ratio;
$cropped_height = $source_height;
$source_x = ($source_width - $cropped_width) / 2;
$source_y = 0;
}else{ // 源图适中
$cropped_width = $source_width;
$cropped_height = $source_height;
$source_x = 0;
$source_y = 0;
}

switch ($source_mime){
case 'image/gif':
$source_image = imagecreatefromgif($source_path);
break;
case 'image/jpeg':
$source_image = imagecreatefromjpeg($source_path);
break;
case 'image/png':
$source_image = imagecreatefrompng($source_path);
break;
default:
return false;
break;
}

$target_image = imagecreatetruecolor($target_width, $target_height);
$cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);

// 裁剪
imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
// 缩放
imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);

header('Content-Type: image/jpeg');
imagejpeg($target_image,$dscFile);
imagedestroy($source_image);
imagedestroy($target_image);
imagedestroy($cropped_image);
}