php中的系统设置有哪些？php中常用系统设置的小结（附代码）

set_time_limit(0);

ini_set('memory_limit','1024M');

ignore_user_abort(true);

date_default_timezone_set("Asia/Shanghai");
echo date_default_timezone_get();

header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
header("Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS");

<?xml version="1.0"?>   
<!DOCTYPE cross-domain-policy SYSTEM "http://www.adobe.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
    <site-control permitted-cross-domain-policies="master-only"/>
    <allow-access-from domain="*"/>
    <allow-http-request-headers-from domain="*" headers="*"/>
</cross-domain-policy>

//开启报错，开发环境
error_reporting(-1);
ini_set('display_errors', 1);
//关闭报错，生产环境
ini_set('display_errors', 0);
if (version_compare(PHP_VERSION, '5.3', '>=')) {
    error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED & ~E_STRICT & ~E_USER_NOTICE & ~E_USER_DEPRECATED);
} else {
    error_reporting(E_ALL & ~E_NOTICE & ~E_STRICT & ~E_USER_NOTICE);
}