function install_drupal in Drupal 7

Same name and namespace in other branches

1. 8 core/includes/install.core.inc \install_drupal()
2. 9 core/includes/install.core.inc \install_drupal()

Installs Drupal either interactively or via an array of passed-in settings.

The Drupal installation happens in a series of steps, which may be spread out over multiple page requests. Each request begins by trying to determine the last completed installation step (also known as a "task"), if one is available from a previous request. Control is then passed to the task handler, which processes the remaining tasks that need to be run until (a) an error is thrown, (b) a new page needs to be displayed, or (c) the installation finishes (whichever happens first).

Parameters

$settings: An optional array of installation settings. Leave this empty for a normal, interactive, browser-based installation intended to occur over multiple page requests. Alternatively, if an array of settings is passed in, the installer will attempt to use it to perform the installation in a single page request (optimized for the command line) and not send any output intended for the web browser. See install_state_defaults() for a list of elements that are allowed to appear in this array.

See also

install_state_defaults()

1 call to install_drupal()

install.php in ./install.php

Initiates a browser-based installation of Drupal.

File

includes/install.core.inc, line 64

API functions for installing Drupal.

Code

function install_drupal($settings = array()) {
  global $install_state;

  // Initialize the installation state with the settings that were passed in,
  // as well as a boolean indicating whether or not this is an interactive
  // installation.
  $interactive = empty($settings);
  $install_state = $settings + array(
    'interactive' => $interactive,
  ) + install_state_defaults();
  try {

    // Begin the page request. This adds information about the current state of
    // the Drupal installation to the passed-in array.
    install_begin_request($install_state);

    // Based on the installation state, run the remaining tasks for this page
    // request, and collect any output.
    $output = install_run_tasks($install_state);
  } catch (Exception $e) {

    // When an installation error occurs, either send the error to the web
    // browser or pass on the exception so the calling script can use it.
    if ($install_state['interactive']) {
      install_display_output($e
        ->getMessage(), $install_state);
    }
    else {
      throw $e;
    }
  }

  // All available tasks for this page request are now complete. Interactive
  // installations can send output to the browser or redirect the user to the
  // next page.
  if ($install_state['interactive']) {
    if ($install_state['parameters_changed']) {

      // Redirect to the correct page if the URL parameters have changed.
      install_goto(install_redirect_url($install_state));
    }
    elseif (isset($output)) {

      // Display a page only if some output is available. Otherwise it is
      // possible that we are printing a JSON page and theme output should
      // not be shown.
      install_display_output($output, $install_state);
    }
  }
}