Wordpress WPQuery

<?php
$temp = $wp_query;
$wp_query = null;
$wp_query = new WP_Query(array(
  'post_type' => 'loox_career',
  'posts_per_page' => 10,
  'paged' => $paged,
  'order' => 'ASC',
  'orderby' => 'title'
  ));
if ($wp_query->have_posts()) :
  ?>
  <h2><strong>Careers</strong></h2>
  <div class="content-wrapper block clearfix">
  <?php $wp_count = 0; ?>
  <?php while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
    <div class="loox-careers <?php ($p_count%2)?print "even":print "odd";?>">
      <h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
      <?php
      // get the post object
      global $post;
      // get the custom data including the custom fields
      $post_custom = get_post_custom($post->ID);
      // sanitize custom fields
      foreach ($post_custom as $key => $value) {
        $post_custom[$key] = wp_kses_post($value[0]);
      }
      // store field values
      $field_values['location'] = $post_custom['location'];
      ?>
      <div class="excerpt"><?php the_excerpt(); ?></div>
    </div>
  <?php endwhile; ?>
  </div>
  <div class="navigation">
    <div class="alignleft"><?php previous_posts_link('&laquo; Previous') ?></div>
    <div class="alignright"><?php next_posts_link('More &raquo;') ?></div>
  </div>
  <?php
endif;
$wp_query = $temp;
$temp = null;
?>
 
<?php
/**
 * Wordpress - WP_query
 */
 
// if you do:
$my_query = new WP_Query($query);
 
// you can do:
while ($my_query->have_posts()):
 $my_query->the_post();
endwhile;
wp_reset_postdata();
 
 
// These types of functions should be in just about every Wordpress functions.php file, says Jeff
// How to easily alter the query of pages by using the pre_get_posts action
// * The pre_get_posts action will pass in $query automatically
// * doing things this way will alter every single query on the page, not just the main one
// ** DON'T USE THIS FUNCTION, USE THE ONE IN THE NEXT SECTION BECAUSE YOU SHOULD ALWAYS JUST
//    MODIFY THE MAIN QUERY
 
function mahoney_alter_home( $query ) {
 global $wp_the_query;
 if ($query->is_home()) {
   $query->set( 'author', '-5' );
  }
 }
 add_action( 'pre_get_posts', 'mahoney_alter_home' );
 
// Using $wp_the_query, which holds the main query, and comparing it to $query,
// we can just alter the main query on a page
// You really always want to check if you are modifying the main query
// If you don't just affect the main query, then template don't really have control over other queries
//  that they may do
 
function mahoney_alter_home( $query ) {
 global $wp_the_query;
 if ($wp_the_query === $query && $query->is_home()) {
   $query->set( 'author', '-5' );
  }
 }
 add_action( 'pre_get_posts', 'mahoney_alter_home' );
 
/*
In wordpress 3.3+, Rather than:
$wp_the_query === $other_query_object
 
You can call:
$other_query_object->is_main_query( )
 
is_main_query( ), the function, will act on $wp_query, like any other conditional tag.
*/
 
/*
Calling the_post( )?
wp_reset_query( ) will reset $wp_query and the globals.
 
Calling $my_query->the_post( )?
wp_reset_postdata( ) will reset the globals.
*/
 
/*
$wp_query is always the main query, unless you use query_posts( ).
Restore it with wp_reset_query( ).
You know what? Just don't ever use query_posts() says Andrew Nacin, a core WP dev; use WP_Query()
*/
 
/*
bit.ly/wpsequery
this page has a diagram of how the queries are run
*/
?>