function install_verify_requirements

Verifies the requirements for installing Drupal.

Parameters

$install_state: An array of information about the current installation state.

Return value

A themed status report, or an exception if there are requirement errors. If there are only requirement warnings, a themed status report is shown initially, but the user is allowed to bypass it by providing 'continue=1' in the URL. Otherwise, no output is returned, so that the next task can be run in the same page request.

File

includes/install.core.inc, line 741

Code

function install_verify_requirements(&$install_state) {
    // Check the installation requirements for Drupal and this profile.
    $requirements = install_check_requirements($install_state);
    // Verify existence of all required modules.
    $requirements += drupal_verify_profile($install_state);
    // Check the severity of the requirements reported.
    $severity = drupal_requirements_severity($requirements);
    // If there are errors, always display them. If there are only warnings, skip
    // them if the user has provided a URL parameter acknowledging the warnings
    // and indicating a desire to continue anyway. See drupal_requirements_url().
    if ($severity == REQUIREMENT_ERROR || $severity == REQUIREMENT_WARNING && empty($install_state['parameters']['continue'])) {
        if ($install_state['interactive']) {
            drupal_set_title(st('Requirements problem'));
            $status_report = theme('status_report', array(
                'requirements' => $requirements,
            ));
            $status_report .= st('Check the error messages and <a href="!url">proceed with the installation</a>.', array(
                '!url' => check_url(drupal_requirements_url($severity)),
            ));
            return $status_report;
        }
        else {
            // Throw an exception showing any unmet requirements.
            $failures = array();
            foreach ($requirements as $requirement) {
                // Skip warnings altogether for non-interactive installations; these
                // proceed in a single request so there is no good opportunity (and no
                // good method) to warn the user anyway.
                if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
                    $failures[] = $requirement['title'] . ': ' . $requirement['value'] . "\n\n" . $requirement['description'];
                }
            }
            if (!empty($failures)) {
                throw new Exception(implode("\n\n", $failures));
            }
        }
    }
}