What happens to files uploaded using an upload script in PHP before the submit button is pressed?

When files are uploaded using an upload script in PHP, they are stored in a temporary location on the server until the submit button is pressed. To ensure that the files are not lost before the form is submitted, you can move them to a permanent location on the server using the move_uploaded_file() function in PHP. 

if(isset($_FILES['file'])) {
    $tempFile = $_FILES['file']['tmp_name'];
    $targetFile = 'uploads/' . $_FILES['file']['name'];
    
    if(move_uploaded_file($tempFile, $targetFile)) {
        echo 'File uploaded successfully';
    } else {
        echo 'Error uploading file';
    }
}

Keywords

file upload PHP script temporary folder file handling form submission

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