Issue
Users can add, edit and delete content on my web page. People can edit the text and the image they upload. However, the image will not display if I only edit the text. When I edit the text but not the image, a white box is displayed where the image should appear. On the other hand, the image will appear if I only edit the photo but nothing else. Only the text will update when I try to edit both the image and text together.I want the user to be able to edit their text and image like they can on a profile page. Once the text and the image is edited, I want the old image to be deleted out of the folder. How can I edit the image and the text together? I am not getting any errors. Please help, I'm new to Php and MySQL. Thank you for your time. 
This is the code:
<?php
include "connection.php";
$vid="";
$vname="";
$vprice="";
if(isset($_POST["button_add"])){
$product_name = $_POST["product_name"];
$product_price = $_POST["product_price"];
$product_picture = $_FILES["product_picture"]["name"];
$qry = mysqli_query($con, "INSERT INTO table_product values('','$product_name','$product_price','$product_picture')") or die("Can not query database" );
if($qry){
$target_dir = "picture/";
$target_file = $target_dir . basename($_FILES["product_picture"]["name"]);
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
if(move_uploaded_file($_FILES["product_picture"]["tmp_name"],
$target_file)){
echo"file uploaded";
}
else{
echo "Upload fail";
}
}
}
else if(isset($_POST["button_edit"])){
$product_name = $_POST["product_name"];
$product_price = $_POST["product_price"];
$product_id = $_POST["product_id"];
if(isset($_FILES["product_picture"]["name"])){
$product_picture = $_FILES["product_picture"]["name"];
$qry = mysqli_query($con,"Update table_product Set product_name='$product_name', product_price='$product_price', product_picture='$product_picture' Where product_id='$product_id'");
$target_dir = "picture/";
$target_file = $target_dir . basename($_FILES["product_picture"]["name"]);
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
move_uploaded_file($_FILES["product_picture"]["tmp_name"],$target_file);
}
else{
$qry = "Update table_product Set product_name='$product_name', product_price='$product_price' Where product_id='$product_id'";
}
$qry_update = mysqli_query($con,$qry);
}
if(isset($_GET["delete"])){
$qry = mysqli_query($con, "Delete From table_product Where product_id='".$_GET["delete"]."'" );
if($qry){
@unlink("picture/".$_GET["picture"]);
}
}
else if(isset($_GET["edit"])){
$qry = mysqli_query($con,"Select * From table_product Where product_id='".$_GET["edit"]."'");
while($row=mysqli_fetch_array($qry,MYSQLI_ASSOC)){
$vid=$row["product_id"];
$vname=$row["product_name"];
$vprice=$row["product_price"];
}
}
?>
<!DOCTYPE html>
<html>
<head>
<title>Product</title>
</head>
<body>
<form action='<?php echo $_SERVER["PHP_SELF"]; ?>' method="post" enctype="multipart/form-data" >
<table>
<tr>
<td>Product ID</td>
<td><input type="text" name="product_id" value="<?php echo $vid;?>"></td></tr>
<tr><td>Product Name</td>
<td><input type="text" name="product_name" value="<?php echo $vname;?>"></td></tr>
<tr><td>Product Price</td>
<td><input type="text" name="product_price" value="<?php echo $vprice;?>"></td></tr>
<tr><td>Product Picture</td>
<td><input type="file" name="product_picture"></td></tr>
<tr><td colspan="2">
<input type="submit" name="button_add" value="Add">
<input type="submit" name="button_edit" value="Edit"></td></tr> </table>
</form>
<table border=1>
<tr><th>product ID</th><th>product Name</th>
<th>product price</th><th>product image</th> <th>Action</th></tr>
<?php
$qry =mysqli_query($con, "Select * From table_product");
while($row=mysqli_fetch_array($qry,MYSQLI_ASSOC)){
echo '<tr><td>'.$row["product_id"].'</td>';
echo '<td>'.$row["product_name"].'</td>';
echo '<td>'.$row["product_price"].'</td>';
echo '<td><img src="picture/'.$row["product_picture"].'" style=width:100px;height:xpx;"/></td>';
echo '<td><a href="?edit='.$row["product_id"].'">Edit</a> |<a href="?delete='.$row["product_id"].'&picture='.$row["product_picture"].'">Delete</a></td></tr>';
}
?>
</table>
<br><br><br>
</body>
</html>
Solution
What is happening is when you edit only the text, the query called also updates the image path but since you don`t add an image it will be NULL. One way is to build a conditional query inside the edit click
if(isset($_FILES["product_picture"]["name"]))
{
$product_picture = $_FILES["product_picture"]["name"];
$sql = "Update table_product Set product_name='$product_name', product_price='$product_price', product_picture='$product_picture' Where product_id='$product_id'";
target_dir = "picture/";
$target_file = $target_dir . basename($_FILES["product_picture"]["name"]);
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
move_uploaded_file($_FILES["product_picture"]["tmp_name"],$target_file);
}
else{
$sql = "Update table_product Set product_name='$product_name', product_price='$product_price' Where product_id='$product_id'"
}
qry = mysqli_query($con,$sql);
Answered By - Mihai
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