<?php
function main_handler($event, $context) {
    print_r($_ENV);
    echo getenv('SCF_RUNTIME');
    return "hello world";
}
?> 

<?php
function main_handler($event, $context) {
    date_default_timezone_set(getenv('TZ'));
    echo date("Y-m-d H:i:s",time()); 
    return "hello world";
}
?> 

<?php
function main_handler($event, $context) {
    $url = 'https://cloud.tencent.com';
    echo file_get_contents($url);
    return "hello world";
}
?>