Magento developer subdomains

index.php

/**
 * Set developer mode and display_errors based on subdomain
 */
$staging_subdomains = array(
    's1',
    's2',
    's3',
    's4',
    's5',
    'mac',
    'local',
    'staging',
    'dev',
    'development',
    'live',
);
foreach ($staging_subdomains as $needle) {
    if (strpos($_SERVER['SERVER_NAME'], $needle . '.') === 0) {
        Varien_Profiler::enable();
        Mage::setIsDeveloperMode(true);
        ini_set('display_errors', 1);
        break;
    }
}

This code should be added after #Varien_Profiler::enable(); in index.php

Code now enables Varien_Profiler::enable(); which needs to be enabled in system configuration.