Wordpress 4.0 send url variables with permalinks - php

Question

I'm trying to send a variable in the url. As I have the permalinks activated, I'm trying to add a rewrite rule, as said on a post I've read here...
Well nothing is working. This is the code I have on functions.php
add_filter('rewrite_rules_array','wp_insertMyRewriteRules');
add_filter('query_vars','wp_insertMyRewriteQueryVars');
add_filter('init','flushRules');
// Remember to flush_rules() when adding rules
function flushRules(){
global $wp_rewrite;
$wp_rewrite->flush_rules();
}
// Adding a new rule
function wp_insertMyRewriteRules($rules)
{
$newrules = array();
$newrules['view-article/(.+)'] = 'index.php?pagename=view-article&aid=$matches[1]';
$finalrules = $newrules + $rules;
return $finalrules;
}
// Adding the var so that WP recognizes it
function wp_insertMyRewriteQueryVars($vars)
{
array_push($vars, 'aid');
return $vars;
}
//Stop wordpress from redirecting
remove_filter('template_redirect', 'redirect_canonical');
and this is the call to get the variable.
$aid = urldecode($wp_query->query_vars['aid']);
What am I doing wrong? :(
My wordpress version is 4.0 (The latest)

Answer 1

Try the following code:
add_action('init', 'flush_urls');
function flush_urls()
{
// Execute flush_rules() on every request can
// slow down your entire website
if('clean' !== get_option('flush_urls', ''))
{
flush_rewrite_rules();
add_option('flush_urls', 'clean');
}
}
add_action('init', 'register_rewrite_rules', 0);
function register_rewrite_rules()
{
add_rewrite_tag('%aid%', '([^/]+)');
add_rewrite_rule(
"view-article/([^/]+)/?",
'index.php?pagename=view-article&aid=$matches[1]',
"top"
);
}
Finally in your template-redirect or an any later action/hook you should do the following:
global $wp_query;
echo $wp_query->query_vars['pagename'];
echo $wp_query->query_vars['aid'];
In case you cannot see these variables inside the $wp_query, then try to save again the permalinks in your WordPress Dashboard. This will clean out the urls cache.