phorge-phorge/src/applications/config/check/PhabricatorSetupCheckImagemagick.php

<?php

final class PhabricatorSetupCheckImagemagick extends PhabricatorSetupCheck {

  protected function executeChecks() {
    $imagemagick = PhabricatorEnv::getEnvConfig('files.enable-imagemagick');
    if ($imagemagick) {
      list($err) = exec_manual('which convert');
      if ($err) {
        $message = pht(
          'You have enabled Imagemagick in your config, but the \'convert\''.
          ' binary is not in the webserver\'s $PATH. Disable imagemagick'.
          ' or make it available to the webserver.');

        $this->newIssue('files.enable-imagemagick')
        ->setName(pht(
          "'convert' binary not found or Imagemagick is not installed."))
        ->setMessage($message)
        ->addRelatedPhabricatorConfig('files.enable-imagemagick')
        ->addPhabricatorConfig('environment.append-paths');
      }
    }
  }
}