move_uploaded_file ( ) - Move an uploaded file Sample

/* get file name here */
        $file_name=$_FILES['profile_img']['name'];
        $file_temp_name=$_FILES['profile_img']['tmp_name'];
       
        $path_name="profile/".$file_name;
       
        if($_FILES['profile_img']['error']>0)
        {
            echo "Return Code : ".$_FILES['profile_img']['error']."</br>";
        }
        else
        {
            $allowed =  array('gif','png' ,'jpg');
            $filename = $_FILES['profile_img']['name'];
            $ext = pathinfo($filename,PATHINFO_EXTENSION);
            if(!in_array($ext,$allowed))
            {
                echo 'File is not allowed';
            }
            else
            {
                /* Move file here */
                $move_result=move_uploaded_file($file_temp_name,$path_name);
                if($move_result==TRUE)
                {
                    /*  Write your success code here */   
                }
        }

Javascript Validation While Image Uploading

<script>

function Checkfiles()
{
    var fup = document.getElementById('profile_img');
    var fileName = fup.value;
    var ext = fileName.substring(fileName.lastIndexOf('.') + 1);
    if(ext == "gif" || ext == "GIF" || ext == "JPEG" || ext == "jpeg" || ext == "jpg" || ext == "JPG" || ext == "doc")
    {
        return true;
    }
    else
    {
        document.getElementById("err_profile_img").innerHTML="Upload a valid image";
        return false;
    }
}

</script>

<input type="file" name="profile_img" id="profile_img" onchange="Checkfiles()"/>