isset( $_Files) not working - php

Question

The problem is the $_FILES['thumbnailPic'] is not picking values from HTML form .I have tried so many solutions but its just not working :(
The HTML code is :
<label >Thumbnail Picture<text>*</text></label><br>
<input type="file" name='thumbnailPic' id="pic"><br>
<label >Original Picture<text>*</text></label><br>
<input type="file" name='originalPic' id="pic"><br>
<input type="submit" name="AddStock" id= "formAddStock" value="Add Stock">
The php code is :
if(!isset($_FILES['thumbnailPic']))
{
echo '<p>Please select a file</p>';
}
else
{
$spID=NULL;
$Quant=$_POST['quantity'];
$Siz=$_POST['Size'];
$imgfp = fopen($_FILES['originalPic']['tmp_name'],'rb');
$stmt = $connection->prepare("INSERT INTO stitchedproduct (sp_id,quantity,size,p_id,color_id,sp_thumbnail,sp_OriginalPic) VALUES (?,?, ?, ?,?,?,?)");
$stmt->bindParam(1, $spID);
$stmt->bindParam(2, $Quant);
$stmt->bindParam(3, $Siz);
$stmt->bindParam(4, $ProductID);
$stmt->bindParam(5, $colour);
$stmt->bindParam(6, $imgfp);
$stmt->bindParam(7, $imgfp);
//$stmt->bindParam(1, $spID);
$stmt->execute();
}

Answer 1

First of all verify that in your HTML code in the <form> tag you have added the enctype="multipart/form-data" attribute.
So your form starting will be like:
<form action="" method="post" enctype="multipart/form-data">
<!-- It's a file-upload form -->
Refer to POST method uploads - Handling file uploads for more.
To check if a file has been successfully uploaded use the "error" key:
if (UPLOAD_ERR_OK === $_FILES["thumbnailPic"]["error"]){
// File uploaded
}
Refer to Error Messages Explained - Handling file uploads for more.
Tip regarding image uploads:
To check if the uploaded file is an image you can check it as:
if (getimagesize($_FILES["thumbnailPic"]["tmp_name"])){
// It's perhaps an image
}
else
{
// Can not be identified as an image
}
Refer here for more.
(and think about the consequences for a moment, what if an image format is known to be used in attacks? what if the getimagesize function returns true but it actually is not an image, but a trojan horse of an image?)

Answer 2

To check file is Uploaded or not :
if (file_exists($_FILES['file_name']['tmp_name']) || is_uploaded_file($_FILES['file_name']['tmp_name'])) {
echo 'Your file has been uploaded';
}
else
{
echo 'Please Select file to Upload';
}
Working 100% for me.

Answer 3

Several possibilities and solution for this issues.
You have to use the enctype="multipart/form-data in your form.
Check the post_max_size and upload_max_filesize in our php.ini file.
if you are uploading image size greater than the values stored in
the post_max_size and upload_max_filesize , then file won't get
uploaded
You can check the error in the file using
$_FILES["thumbnailPic"]["error"]