php+jquery+Jcrop实现下传-截取-保存图片功能

$(document).ready(function(){
	var bar = $('.bar');
	var percent = $('.percent');
	var showimg = $('#showimg');
	var progress = $(".progress");
	var files = $(".files");
	var btn = $(".btn span");
	$("#fileupload").wrap("<form id='myupload' action='action.php' method='post' enctype='multipart/form-data'></form>");
	$("#fileupload").change(function(){  //选择文件
		$("#myupload").ajaxSubmit({
			dataType:  'json',	//数据&#26684;式为json 
			beforeSend: function() {	//开始上传 
				showimg.empty();	//清空显示的图片
				progress.show();	//显示进度条
				var percentVal = '0%';	//开始进度为0%
				bar.width(percentVal);	//进度条的宽度
				percent.html(percentVal);	//显示进度为0% 
				btn.html("上传中...");	//上传按钮显示上传中
			},
			uploadProgress: function(event, position, total, percentComplete) {
				var percentVal = percentComplete &#43; '%';	//获得进度
				bar.width(percentVal);	//上传进度条宽度变宽
				percent.html(percentVal);	//显示上传进度百分比
			},
			success: function(data) {	//成功
				//获得后台返回的json数据，显示文件名，大小，以及删除按钮
				files.html("<b>"&#43;data.name&#43;"("&#43;data.size&#43;"k)</b> <span class='delimg' rel='"&#43;data.pic&#43;"'>删除</span>");
				//显示上传后的图片
				var img = "upload/face/"&#43;data.pic;
				//判断上传图片的大小 然后设置图片的高与宽的固定宽
				if (data.width>240 && data.height<240){
					showimg.html("@@##@@");
				}else if(data.width<240 && data.height>240){
					showimg.html("@@##@@");
				}else if(data.width<240 && data.height<240){
					showimg.html("@@##@@");
				}else{
					showimg.html("@@##@@");
				}
				//传给php页面，进行保存的图片&#20540;
				$("#src").val(img);
				//截取图片的js
				$('#cropbox').Jcrop({
					aspectRatio: 1,
					onSelect: updateCoords,
					minSize:[240,240],
					maxSize:[240,240],
					allowSelect:false, //允许选择
					allowResize:false, //是否允许调整大小
					setSelect: [ 0, 0, 240, 240 ]
				});
				btn.html("上传图片");	//上传按钮还原
			},
			error:function(xhr){	//上传失败
				btn.html("上传失败");
				bar.width('0')
				files.html(xhr.responseText);	//返回失败信息
			}
		});
	});
	
	$(".delimg").live('click',function(){
		var pic = $(this).attr("rel");
		$.post("action.php?act=delimg",{imagename:pic},function(msg){
			if(msg==1){
				files.html("删除成功.");
				showimg.empty();	//清空图片
				progress.hide();	//隐藏进度条 
			}else{
				alert(msg);
			}
		});
	});
	
});

function updateCoords(c){
	$('#x').val(c.x);
	$('#y').val(c.y);
	$('#w').val(c.w);
	$('#h').val(c.h);
};

function checkCoords(){
	if (parseInt($('#w').val())) return true;
	alert('Please select a crop region then press submit.');
	return false;
};

<?php
$action = $_GET['act'];
if($action=='delimg'){
	$filename = $_POST['imagename'];
	if(!empty($filename)){
		unlink('upload/face/'.$filename);
		echo '1';
	}else{
		echo '删除失败.';
	}
}else{
	$picname = $_FILES['mypic']['name'];
	$picsize = $_FILES['mypic']['size'];
	if ($picname != "") {
		if ($picsize > 1024000) {
			echo '图片大小不能超过1M';
			exit;
		}
		$type = strstr($picname, '.');
		if ($type != ".gif" && $type != ".jpg") {
			echo '图片&#26684;式不对！';
			exit;
		}
		$rand = rand(100, 999);
		$pics = date("YmdHis") . $rand . $type;
		//上传路径
		$pic_path = "upload/face/". $pics;
		move_uploaded_file($_FILES['mypic']['tmp_name'], $pic_path);
	}
	$size = round($picsize/1024,2);
	$image_size = getimagesize($pic_path);
	$arr = array(
		'name'=>$picname,
		'pic'=>$pics,
		'size'=>$size,
		'width'=>$image_size[0],
		'height'=>$image_size[1]
	);
	echo json_encode($arr);
}
?>

<?php
	if ($_SERVER['REQUEST_METHOD'] == 'POST'){
		//删除会员以前的头像
		if(file_exists($MemberFace)) {
			unlink($MemberFace);
		}
		$MemberFace = sliceBanner("cuteboy");
		echo $MemberFace;
		exit;
	}
	
	function sliceBanner($UserName){
		$x = (int)$_POST['x'];
		$y = (int)$_POST['y'];
		$w = (int)$_POST['w'];
		$h = (int)$_POST['h'];
		$pic = $_POST['src'];
		
		//剪切后小图片的名字
		$str = explode(".",$pic);//图片的&#26684;式
		$type = $str[1]; //图片的&#26684;式
		$filename = $UserName."_".date("YmdHis").".". $type; //重新生成图片的名字
		$uploadBanner = $pic;
		$sliceBanner = "upload/face/".$filename;//剪切后的图片存放的位置
		
		//创建图片
		$src_pic = getImageHander($uploadBanner);
		$dst_pic = imagecreatetruecolor($w, $h);
		imagecopyresampled($dst_pic,$src_pic,0,0,$x,$y,$w,$h,$w,$h);
		imagejpeg($dst_pic, $sliceBanner);
		imagedestroy($src_pic);
		imagedestroy($dst_pic);
		
		//删除已上传未裁切的图片
		if(file_exists($uploadBanner)) {
			unlink($uploadBanner);
		}
		//返回新图片的位置
		return $sliceBanner;
	}
	//初始化图片
	function getImageHander ($url) {
		$size=@getimagesize($url);
		switch($size['mime']){
			case 'image/jpeg': $im = imagecreatefromjpeg($url);break;
			case 'image/gif' : $im = imagecreatefromgif($url);break;
			case 'image/png' : $im = imagecreatefrompng($url);break;
			default: $im=false;break;
		}
		return $im;
	}
?>