get post url before creation wordpress code example

Example 1: php get youtube code from url

<?php
$url = "http://www.youtube.com/watch?v=C4kxS1ksqtw&feature=relate";
parse_str( parse_url( $url, PHP_URL_QUERY ), $my_array_of_vars );
echo $my_array_of_vars['v'];    
  // Output: C4kxS1ksqtw
?>

Example 2: wordpress exclude current post from loop

$args = array(
    'numberposts' => 5,
    'offset' => 0,
    'category' => 7,
    'post__not_in' => array( $post->ID )
);
$myposts2 = get_posts($args);