Rename image before upload and insert name in database with PHP - php

Question

I want image rename before upload and after renamed image name should be inserted into database with PHP. I am using following code to upload image and insert some other data into database. Please help me out to rename image because I'm beginner with PHP.
<?php
if(isset($_POST['submit'])) {
$post_image = $_FILES['post_image']['name'];
$post_image_tmp = $_FILES['post_image']['tmp_name'];
$post_content = $_POST['post_content'];
if ($post_image=='' OR $post_content=='') {
echo "<script>alert('Fiil In All Fields')</script>";
} else {
move_uploaded_file($post_image_tmp, "../post_imgs/$post_image");
$insert_post ="INSERT INTO posts(post_image,post_content)values('$post_image','$post_content')";
$run_post= mysql_query($insert_post);
echo "<script>alert('Post has been Published Now...')</script>";
echo "<script>window.open('index.php?insert_post=insert','_self')</script>";
}
}
?>

Answer 1

$tmp_file = $_FILES['uploadedfile']['tmp_name'];
$ext = pathinfo($_FILES["uploadedfile"]["name"], PATHINFO_EXTENSION);
$rand = md5(uniqid().rand());
$post_image = $rand.".".$ext;
move_uploaded_file($tmp_file,"../post_imgs/".$post_image);

Answer 2

Try this..
<?php
if(isset($_POST['submit'])) {
$post_image = $_FILES['post_image']['name'];
$post_image_tmp = $_FILES['post_image']['tmp_name'];
$post_content = $_POST['post_content'];
if ($post_image=='' OR $post_content=='') {
echo "<script>alert('Fiil In All Fields')</script>";
} else {
$newname="image".$post_image;
$path='../post_imgs/';
$pathAndName = $path.$newname;
$moveResult = move_uploaded_file($post_image_tmp, $pathAndName);//move to folder
$insert_post ="INSERT INTO posts(post_image,post_content)values('$newname','$post_content')";
$run_post= mysql_query($insert_post);
echo "<script>alert('Post has been Published Now...')</script>";
echo "<script>window.open('index.php?insert_post=insert','_self')</script>";
}
}
?>