Mudar o domínio base do Wordpress.

fix_domain.php

<?php

  $mysql_host = 'localhost';
  $mysql_user = '';
  $mysql_pass = '';
  $mysql_base = 'wordpress_database';

  $old_domain = 'www.old_domain.com';
  $new_domain = 'www.new_domain.com';

  if($conn = mysql_connect($mysql_host, $mysql_user, $mysql_pass)) {
    mysql_select_db($mysql_base, $conn);
  } else {
    echo mysql_error(); mysql_close($conn); exit;
  }

  $replaces = array(
    'wp_comments' => array('comment_content'),
    'wp_options'  => array('option_value'),
    'wp_postmeta' => array('meta_value'),
    'wp_posts'    => array('post_content', 'guid')
  );

  echo "\nMigrating $old_domain to $new_domain...\n";

  foreach ($replaces as $table => $columns) {
    foreach ($columns as $column) {
      echo "\n - Migrating {$table}[$column]...\n";
      mysql_query("UPDATE {$table} SET {$column}=REPLACE({$column}, '{$old_domain}', '{$new_domain}') WHERE {$column} LIKE '%$old_domain%'");
    }
  }

  echo "\nDone! [$old_domain to $new_domain] =)\n\n";

  mysql_close($conn);

?>