Generates an url

generate-url.php

<?php 

  /**
   * Generates an url
   *
   * @param array $params List of params
   *
   * @internal string $params['baseUrl'] The base url, default: $_SERVER['REQUEST_URI']
   * @internal array $params['queryAdd'] Adds extra query params as associative array
   * @internal array $params['queryRemove'] Removes query parameters as simple array
   * @internal bool $params['forceAbsolute'] Forces the generated url to be an absolute url based on the current domain
   *
   * @return null|string
   */

  public function generateUrl( $params = array() ) {

      $params = is_array( $params ) ? $params : array();

      $forceAbsolute = isset( $params[ 'forceAbsolute' ] ) && $params[ 'forceAbsolute' ];

      $baseUrl = isset( $params[ 'baseUrl' ] ) ? trim( $params[ 'baseUrl' ] ) : '';

      if ( !$baseUrl ) {
          $baseUrl = $_SERVER[ 'REQUEST_URI' ];
      }

      $baseUrl = rawurldecode( $baseUrl );

      $urlParts = parse_url( $baseUrl );

      if ( !$urlParts ) {
          return NULL;
      }

      $scheme = isset( $urlParts[ 'scheme' ] ) ? trim( $urlParts[ 'scheme' ] ) : '';

      if ( $forceAbsolute && !$scheme ) {

          $scheme = 'http';

          if ( isset( $_SERVER[ 'HTTPS' ] ) && $_SERVER[ 'HTTPS' ] !== 'off' ) {
              $scheme .= 's';
          }

      }

      $host = isset( $urlParts[ 'host' ] ) ? trim( $urlParts[ 'host' ] ) : '';

      if ( $forceAbsolute && !$host ) {
          $host = $_SERVER[ 'SERVER_NAME' ];
      }

      $port = isset( $urlParts[ 'port' ] ) ? trim( $urlParts[ 'port' ] ) : '';

      $path = isset( $urlParts[ 'path' ] ) ? trim( $urlParts[ 'path' ] ) : '';
      $query = isset( $urlParts[ 'query' ] ) ? trim( $urlParts[ 'query' ] ) : '';
      $fragment = isset( $urlParts[ 'fragment' ] ) ? trim( $urlParts[ 'fragment' ] ) : '';

      $user = isset( $urlParts[ 'user' ] ) ? trim( $urlParts[ 'user' ] ) : '';
      $pass = isset( $urlParts[ 'pass' ] ) ? trim( $urlParts[ 'pass' ] ) : '';

      $url = '';

      # scheme

      if ( !$scheme ) {

          if ( $host ) {
              $url .= '//';
          }


      }
      else {
          $url .= $scheme.'://';
      }

      # host

      if ( $host ) {

          # user and pass

          $auth = '';

          if ( $user ) {

              $auth .= $user;

          }

          if ( $pass ) {
              $auth .= ':'.$pass;
          }

          if ( $auth ) {
              $url .= $auth.'@';
          }

          # the host ...

          $url .= $host;

          # port

          if ( $port ) {

              $port = (int) $port;

              if ( $port != 80 && $port != 443 ) {
                  $url .= ':'.$port;
              }

          }

      }

      # path

      if ( $path ) {

          if ( $forceAbsolute ) {

              if ( stripos( $path, '/' ) !== 0 ) {
                  $path = '/'.$path;
              }

          }

          $url .= $path;
      }

      # query

      $queryArray = array();

      if ( $query ) {
          parse_str( $query, $queryArray );
      }

      $queryAdd = isset( $params[ 'queryAdd' ] ) && is_array( $params[ 'queryAdd' ] ) ? $params[ 'queryAdd' ] : array();

      if ( !empty( $queryAdd ) ) {

          foreach ( $queryAdd as $k => $v ) {
              $queryArray[ $k ] = $v;
          }

      }

      $queryRemove = isset( $params[ 'queryRemove' ] ) && is_array( $params[ 'queryRemove' ] ) ? $params[ 'queryRemove' ] : array();

      if ( !empty( $queryRemove ) ) {

          foreach ( $queryRemove as $k ) {
              unset( $queryArray[ $k ] );
          }

      }

      if ( !empty( $queryArray ) ) {
          $url .= "?".http_build_query( $queryArray );
      }

      # fragment

      if ( $fragment ) {

          $url .= '#'.$fragment;

      }

      return $url;
  }