文件上传$ _FILES获取空值 [英] File Upload $_FILES getting empty value

问题描述

我想在html文件输入类型更改并且应该上载文件时触发ajax表单提交。但在PHP文件中，文件名为空。



HTML

 <  表格    id   =  UploadForm   方法  =  post    enctype   =  multipart / form-data >  
 <  输入    type   =  file   <温泉n class =code-attribute> id   =  upload   名称  = 上传   >  
 <   / form  >  

Javascript：

 unction uploadimg（）{
 $ .ajax（ {
 url：  uploadImg.php，
 data：{}， 
成功： function （响应）{
  console  .log（响应）; 
  if （response ==   success ）{
 alert（  Image Uploadedloaded Successfully）; 
} 
  else   if （response ==  无效）{
 alert（ 无效的文件类型）; 
} 
  else  {
 alert（ 图片未上传）; 
} 
} 
}）; 
} 

PHP：

  $ allowedExts  = array（  gif，  jpeg，  jpg，  png） ; 
  //   $ temp = explode（。，$ _FILES [upload] [name ]）; // image  
  //   $ extension = end（$ temp）;  
  echo  $ _FILES [  upload] [  name]; 
 $ ext = pathinfo（$ _ FILES [  upload] [  name]，PATHINFO_EXTENSION）; 
  echo    ------ --------------。$ ext。   - -----------------------; 
 $ src =  ; 
  if （（$ $ _FILES [ 上传] [  type] ==   image / gif）
 ||（$ _FILES [  upload] [  type ] ==   image / jpeg）
 ||（$ _FILES [  upload] [  type] ==   image / jpg）
 ||（$ _FILES [  upload] [  type] ==   image / pjpeg）
 || （$ _FILES [  upload] [  type] ==   image / x- png）
 || （$ _FILES [  upload] [  type] ==   image / png ））
&& in_array（$ extension，$ allowedExts））{
  $ filename  = $ _SESSION [' < span class =code-string> username']。 $ _FILES ['  upload'] ['  name']; 
 move_uploaded_file（$ _ FILES ['  upload'] ['  tmp_name']，  upload /。$ filename）; 
  //  更新查询 
 
 $ query =   update js_basic_details set image ='。$ filename。 'where email_id ='。$ _ SESSION ['  username']。 '; 
 if（mysql_query（$ query））
  return   成功; 
  else  
  return   错误; 
} 
 else {
  echo   无效 ; 
} 

解决方案

.ajax（{
url： uploadImg.php，
data：{}，
成功： function （响应）{
console .log（响应）;
if （response == success）{
alert（ 图片上传成功）;
}
else if （response == 无效）{
alert（ 无效的文件类型）;
}
else {
alert（ 伊玛ge未上传）;
}
}
}）;
}

PHP：

allowedExts = array（ gif， jpeg， jpg， PNG）;
//

temp = explode（。，

I want to fire an ajax form submit when an html file input type changes and the file should be uploaded. but in the PHP file the filename is empty.

HTML

<form id="UploadForm" method="post" enctype="multipart/form-data">
<input type="file" id="upload" name="upload" >
</form>

Javascript:

unction uploadimg(){
		$.ajax({
			url:"uploadImg.php",
			data:{},
			success:function(response){
				console.log(response);
				if(response=="success"){
					alert("Image Uploaded Successfully");
				}
				else if(response=="Invalid"){
					alert("Invalid File Type");
				}
				else{
					alert("Image Not Uploaded");
				}
			}
		});
	}

PHP:

$allowedExts = array("gif", "jpeg", "jpg", "png");
	//$temp = explode(".", $_FILES["upload"]["name"]); //image
	//$extension = end($temp);
	echo $_FILES["upload"]["name"];
	$ext=pathinfo($_FILES["upload"]["name"],PATHINFO_EXTENSION);
	echo "--------------------".$ext."-------------------------";
	$src="";
	if ((($_FILES["upload"]["type"] == "image/gif")
	|| ($_FILES["upload"]["type"] == "image/jpeg")
	|| ($_FILES["upload"]["type"] == "image/jpg")
	|| ($_FILES["upload"]["type"] == "image/pjpeg")
	|| ($_FILES["upload"]["type"] == "image/x-png")
	|| ($_FILES["upload"]["type"] == "image/png"))
	&& in_array($extension, $allowedExts)) {
		$filename = $_SESSION['username']. $_FILES['upload']['name'];
		move_uploaded_file($_FILES['upload']['tmp_name'],"upload/". $filename);
		//Update Query
		
		$query="update js_basic_details set image='".$filename."' where email_id='".$_SESSION['username']."'";
		if(mysql_query($query))
			return "success";
		else
			return "Error";
	}
	else{
		echo "Invalid";
	}

解决方案

.ajax({ url:"uploadImg.php", data:{}, success:function(response){ console.log(response); if(response=="success"){ alert("Image Uploaded Successfully"); } else if(response=="Invalid"){ alert("Invalid File Type"); } else{ alert("Image Not Uploaded"); } } }); }

PHP:

allowedExts = array("gif", "jpeg", "jpg", "png"); //

temp = explode(".",

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