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Wordpress Function For Getting Custom Posts IDs From Their URLs
<?php
/* Post URLs to IDs function, supports custom post types - borrowed and modified from url_to_postid() in wp-includes/rewrite.php */
function bwp_url_to_postid($url)
{
global $wp_rewrite;
$url = apply_filters('url_to_postid', $url);
// First, check to see if there is a 'p=N' or 'page_id=N' to match against
if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) ) {
$id = absint($values[2]);
if ( $id )
return $id;
}
// Check to see if we are using rewrite rules
$rewrite = $wp_rewrite->wp_rewrite_rules();
// Not using rewrite rules, and 'p=N' and 'page_id=N' methods failed, so we're out of options
if ( empty($rewrite) )
return 0;
// Get rid of the #anchor
$url_split = explode('#', $url);
$url = $url_split[0];
// Get rid of URL ?query=string
$url_split = explode('?', $url);
$url = $url_split[0];
// Add 'www.' if it is absent and should be there
if ( false !== strpos(home_url(), '://www.') && false === strpos($url, '://www.') )
$url = str_replace('://', '://www.', $url);
// Strip 'www.' if it is present and shouldn't be
if ( false === strpos(home_url(), '://www.') )
$url = str_replace('://www.', '://', $url);
// Strip 'index.php/' if we're not using path info permalinks
if ( !$wp_rewrite->using_index_permalinks() )
$url = str_replace('index.php/', '', $url);
if ( false !== strpos($url, home_url()) ) {
// Chop off http://domain.com
$url = str_replace(home_url(), '', $url);
} else {
// Chop off /path/to/blog
$home_path = parse_url(home_url());
$home_path = isset( $home_path['path'] ) ? $home_path['path'] : '' ;
$url = str_replace($home_path, '', $url);
}
// Trim leading and lagging slashes
$url = trim($url, '/');
$request = $url;
// Look for matches.
$request_match = $request;
$postId = 0;
foreach ( (array)$rewrite as $match => $query) {
// If the requesting file is the anchor of the match, prepend it
// to the path info.
if ( !empty($url) && ($url != $request) && (strpos($match, $url) === 0) )
$request_match = $url . '/' . $request;
if ( preg_match("!^$match!", $request_match, $matches) ) {
// Got a match.
// Trim the query of everything up to the '?'.
$query = preg_replace("!^.+\?!", '', $query);
// Substitute the substring matches into the query.
$query = addslashes(WP_MatchesMapRegex::apply($query, $matches));
// Filter out non-public query vars
global $wp;
parse_str($query, $query_vars);
$query = array();
foreach ( (array) $query_vars as $key => $value ) {
if ( in_array($key, $wp->public_query_vars) )
$query[$key] = $value;
}
// Taken from class-wp.php
foreach ( $GLOBALS['wp_post_types'] as $post_type => $t )
if ( $t->query_var )
$post_type_query_vars[$t->query_var] = $post_type;
foreach ( $wp->public_query_vars as $wpvar ) {
if ( isset( $wp->extra_query_vars[$wpvar] ) )
$query[$wpvar] = $wp->extra_query_vars[$wpvar];
elseif ( isset( $_POST[$wpvar] ) )
$query[$wpvar] = $_POST[$wpvar];
elseif ( isset( $_GET[$wpvar] ) )
$query[$wpvar] = $_GET[$wpvar];
elseif ( isset( $query_vars[$wpvar] ) )
$query[$wpvar] = $query_vars[$wpvar];
if ( !empty( $query[$wpvar] ) ) {
if ( ! is_array( $query[$wpvar] ) ) {
$query[$wpvar] = (string) $query[$wpvar];
} else {
foreach ( $query[$wpvar] as $vkey => $v ) {
if ( !is_object( $v ) ) {
$query[$wpvar][$vkey] = (string) $v;
}
}
}
if ( isset($post_type_query_vars[$wpvar] ) ) {
$query['post_type'] = $post_type_query_vars[$wpvar];
$query['name'] = $query[$wpvar];
}
}
}
// Do the query
$query = new WP_Query($query);
if ( !empty($query->posts) && $query->is_singular ) {
$postId = $query->post->ID;
}
}
}
return $postId;
}
?>
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