如何在Visual Studio代码段创建中对$进行转义

似乎在使用$ _SERVER之类的PHP变量时，代码片段会忽略$。例如

{
// Example:
"IP Address Test": {
    "scope": "php",
    "prefix": "iptest",
    "body": [
                "// Debugging",
                "if($_SERVER[\"REMOTE_ADDR\"]=='${1:ipaddress}'){",
                "\t//run only my ip",
                "\t$0",
                "}"
    ],
    "description": "Test only from IP address"
}

}

输出：

// Debugging
if(_SERVER["REMOTE_ADDR"]=='xxx.xxx.xxx.xxx'){
//run only my ip

}