Image reselect php - php

Question

I have a table where each row has an image and some text. Currently, when I update the content without selecting an image, the database field for the image gets cleared out. However, I want to keep the old image if there's no image selected.
How can I accomplish this?
As a note, I know that mysql_* functions are deprecated.
<?php
include("db/db.php");
$select_db = "select * from aboutus WHERE id=1";
$run_news = mysql_query($select_db);
while ($row = mysql_fetch_array($run_news)) {
$id = $row['id'];
$image = $row['image'];
$content = $row['content'];
}
?>
<div class="box box-primary">
<div class="box-header with-border">
<h3 class="box-title">Update About Content</h3>
</div>
<!-- /.box-header -->
<!-- form start -->
<form role="form" method="post" action="aboutcontent.php?id=1" enctype="multipart/form-data">
<div class="box-body">
<div class="form-group">
<label for="exampleInputFile">Reselect Image *(H=530px, W=800px)</label>
<input type="file" name="user_image" id="exampleInputFile">
</div>
<div class="form-group">
<label >Content</label><br>
<textarea name="content" class="tinymce" class="form-control" rows="15"><?php echo $content; ?></textarea>
</div>
</div>
<!-- /.box-body -->
<div class="box-footer">
<button type="submit" name="update" class="btn btn-primary">Update</button>
</div>
</form>
</div>
<?php
include("db/db.php");
// Code for UPDATE button
if (isset($_POST['update'])) {
$content = $_POST['content'];
$imgFile = $_FILES['user_image']['name'];
$tmp_dir = $_FILES['user_image']['tmp_name'];
$imgSize = $_FILES['user_image']['size'];
if ($imgFile) {
$upload_dir = 'images/about/'; // upload directory
$imgExt = strtolower(pathinfo($imgFile, PATHINFO_EXTENSION)); // get image extension
$valid_extensions = array('jpeg', 'jpg', 'png', 'gif'); // valid extensions
$userpic = rand(1000, 1000000) . "." . $imgExt;
if (in_array($imgExt, $valid_extensions)) {
if ($imgSize < 5000000) {
unlink($upload_dir . $row['image']);
move_uploaded_file($tmp_dir, $upload_dir . $userpic);
}
else {
$errMSG = "Sorry, your file is too large it should be less then 5MB";
}
}
else {
$errMSG = "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
}
}
else {
// if no image selected the old image remain as it is.
$userpic = $row['image']; // old image from database
}
// if no error occured, continue ....
$sql = "UPDATE aboutus SET image='$userpic', content='$content' WHERE id=1";
$query = mysql_query($sql);
if (!$query) {
die('Invalid query: ' . mysql_error());
}
else {
echo "<script>alert('Successfully Updated!!!'); window.location='index.php?aboutcontent'</script>";
}
}
?>

Answer 1

The problem can easily be solved by checking if a file was submitted or not:
if(!empty($userpic)){
// SQL update here
} else {
// No file submitted so don't update
}
The reason you were getting empty mysql fields is because you were updating the field with an empty variable.

Answer 2

Since I can't comment yet, when you submit without an image are you landing in the if or else statement (place a die('some content) in each part) to figure this out. If you are not making it to the else, try:
//initialize error message
$errMSG = '';
//this error means 'There is no error, the file uploaded with success'
if($_FILES['user_image']['error'] == 0){
//rest of logic to get the filename and move files stuff
}
else{
$userpic = $row['image'];
}
//you dont want to update database if there are errors
if(errMSG = ''{
$sql = "UPDATE aboutus SET image='$userpic', content='$content' WHERE id=1";
}
OR just make two different database calls, one for when you have an image and one for when you dont
if($_FILES['user_image']['error'] == 0){
//rest of logic to get the filename and move files stuff
//if everything else is true (has filename and correct file size)
//you dont want to update database if there are errors
if(errMSG = ''{
$sql = "UPDATE aboutus SET image='$userpic', content='$content' WHERE id=1";
}
$sql = "UPDATE aboutus SET image='$userpic', content='$content' WHERE id=1";
}
else{
$userpic = $row['image'];
$sql = "UPDATE aboutus SET content='$content' WHERE id=1";
}
http://php.net/manual/en/features.file-upload.errors.php