如何在PHP中将mysql库代码转换为mysqli？

Help me to modify my code according to new standards and API.

I have create a file like.php: I have created a function for getting result in return with ternary operator

function article_exists($article_id)
    {
        $article_id =(int)$article_id;
        return (mysql_result("SELECT COUNT(article_id) from articles where article_id= $article_id", 0)==0)?false:true;
    }

I want to use the code with mysqli_result and i m calling it from another page I need to get print exist when my page index.php runs

index.php

if(article_exists(1)===true)
    {
    echo "exist";
    }

you have to change the script like this

function article_exists($article_id){
    $article_id =(int)$article_id;
    return (mysqli_query($connect,"SELECT COUNT(article_id) from articles where article_id= $article_id", 0)==0)?false:true;
}

## Connection File ##
$connect= mysqli_connect("localhost","my_user","my_password","my_db");

// Check connection
 if (mysqli_connect_errno()) {
   echo "Failed to connect to MySQL: " . mysqli_connect_error();
 }