how to rename a file while uploading PHP

Question

I am using following code to upload file, every thing is working fine, i just want to upload file with new name that should be current time of uploading, Actually i want to upload file with name as upload time

<?php


$statusMsg = '';

// File upload path
$targetDir = "../uploads/";
$fileName = basename($_FILES["file"]["name"]);
$targetFilePath = $targetDir . $fileName;
$fileType = pathinfo($targetFilePath,PATHINFO_EXTENSION);

if(isset($_POST["submit"]) && !empty($_FILES["file"]["name"])){
    // Allow certain file formats
    $book_title=$_POST['book_title'];
    $allowTypes = array('jpg','png','jpeg');
    if(in_array($fileType, $allowTypes)){
        // Upload file to server
        if(move_uploaded_file($_FILES["file"]["tmp_name"], $targetFilePath)){
            // Insert image file name into database
            $insert = mysqli_query($con,"INSERT into books (book_title,book_author,book_image,book_url) VALUES ('','','".$fileName."', '.')");
            if($insert){
                $statusMsg = "The file ".$fileName. " has been uploaded successfully.";
            }else{
                $statusMsg = "File upload failed, please try again.";
            } 
        }else{
            $statusMsg = "Sorry, there was an error uploading your file.";
        }
    }else{
        $statusMsg = 'Sorry, only JPG, JPEG, PNG, GIF, & PDF files are allowed to upload.';
    }
}else{
    $statusMsg = 'Please select a file to upload.';
}

// Display status message
echo $statusMsg;

?>

Answer 1

Adding current date in to the filename received from the user

$fileName = date('Y-m-d_') . basename($_FILES["file"]["name"]);

In case they add more than one file in a day you could also add the time as well

$fileName = date('Y-m-d_His_') . basename($_FILES["file"]["name"]);

Answer 2

By default $_FILES['file']['name'] is the actual name of file user uploads, suppose user uploads the file 'demoImage.jpeg' from the explorer then it is the actual name assigns to $fileName in your code, just modify this line of code as given below:

Change this

$fileName = basename($_FILES["file"]["name"]);

to

$fileName = Date('His') . $fileType;

You can change the Date function's parameter to generate specific date/time for your file name.