How to determine whether there are parameters in php

How to determine whether there are parameters in php: first obtain the link through the "$_SERVER["REQUEST_URI"];" method; then determine whether there are parameters in the link through the if statement; and finally output the judgment result through echo.

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Example: php determines whether the URL has parameters

$old_url = $_SERVER["REQUEST_URI"]; 
//检查链接中是否存在 ? 
$check = strpos($old_url, '?'); 
//如果存在 ? 
if($check !== false) 
{ 
    //如果 ? 后面没有参数，如 http://www.yitu.org/index.php? 
    if(substr($old_url, $check+1) == '') 
    { 
    //可以直接加上附加参数 
    $new_url = $old_url; 
    } 
    //如果有参数，如：http://www.yitu.org/index.php?ID=12 
    else 
    { 
    $new_url = $old_url.'&'; 
    } 
}
//如果不存在 ?  
else 
{ 
    $new_url = $old_url.'?'; 
} 
    echo $new_url;

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