Execute drush for a given list of sites

drush_clear_all.php

<?php

// clearcacheall.php alias/druh >> cacheclear.log
$list_sites = [];

$drush_alias = $argv[1];

// Iterate on them to execute the drush command.
foreach ($list_sites as $site) {
  execDrushCommand($site['alias'], $drush_alias);
}


/**
 * Execute drush.
 *
 * @param [type] $site_alias
 * @param [type] $drush_alias
 * @return void
 */
function execDrushCommand($site_alias, $drush_alias)
{
  // Iterate on them to execute the drush command.
  $result = exec("drush  $drush_alias  -l  $site_alias [COMMAND_HERE] ", $output, $return);

  echo "Result:: ";
  print_r($result);

  echo "Output:: ";
  print_r($output);
}