Simple helper functions to get, sanitize, and process URLs in wordpress. (Find and replace `_s_` with your own namespacing.)

wordpress-url-helpers.php

<?php

// Get and sanitize the current URL
function _s_get_url() {

    // Get URL
    $url  = @( $_SERVER['HTTPS'] != 'on' ) ? 'http://' . $_SERVER['SERVER_NAME'] :  'https://' . $_SERVER['SERVER_NAME'];
    // $url .= ( $_SERVER['SERVER_PORT'] !== 80 ) ? ":" . $_SERVER['SERVER_PORT'] : ''; // Uncomment to add port number
    $url .= $_SERVER['REQUEST_URI'];

    return $url;
}


// Get the site domain and remove the www.
function _s_get_site_domain() {
    $sitename = strtolower( $_SERVER['SERVER_NAME'] );
    if ( substr( $domain, 0, 4 ) == 'www.' ) {
        $sitename = substr( $sitename, 4 );
    }
    return $sitename;
}


// Prepare URL for status string
function _s_prepare_url( $url ) {

    // If URL has a '?', add an '&'.
    // Otherwise, add a '?'.
    $url_status = strpos($url, '?');
    if ( $url_status === false ) {
        $concate = '?';
    } 
    else {
        $concate = '&';
    }

    return $url . $concate;
}


// Remove a $_GET variable from the URL
function _s_clean_url( $variable, $url ) { 
    $new_url = preg_replace('/(?:&|(\?))' . $variable . '=[^&]*(?(1)&|)?/i', '$1', $url);
    $last_char = substr( $new_url, -1 );
    if ( $last_char == '?' ) {
        $new_url = substr($new_url, 0, -1);
    }
    return $new_url;
}

?>