January 23, 2024 5:01 am

How to use MySQLi_connect in PHP

As you all knows that MySQLi is improved PHP extension of MySQL which is introduced in PHP 5. MySQL is deprecated in PHP 5.5 will be removed in future. We have millions of applications using PHP MySQL and needs to be updated on MySQLi or PDO (PHP Data Objects is also a new extension you can use to use in your applications). So today i am going to give you a very simple integration guide of MySQLi how to connect to a database, how to  run a query and insert records etc hope you love this article.


Example of mysqli connection with the object method:

$sql = new mysqli('localhost','root','password','dbname');

Example of mysqli connection with the procedural method:

$con = mysqli_connect('localhost','root','password','dbname');

Connection error checking with object method:

$sql = new mysqli('localhost', 'root', 'password', 'dbname');

if($db->connect_errno > 0){
    die('Unable to connect to database [' . $db->connect_error . ']');

Connection error checking with procedural method:

$con = mysqli_connect("HostName","UserName","password","DBName") or die("Some error occurred during connection " . mysqli_error($con));

Escaping characters with mysqli real escape:

$db->real_escape_string('This is an un-escaped "string"');

//there is an alias function less typed

$db->escape_string('This is an un-escape "string"');


Simple procedure with complete code with procedural method:

//Create the connection  

$con = mysqli_connect("HostName","UserName","password","DBName") or die("Some error occurred during connection " . mysqli_error($con));  

// Write query

$strSQL = "SELECT username FROM MyTable";

// Execute the query.

$query = mysqli_query($con, $strSQL);
while($result = mysqli_fetch_array($query))
  echo $result["username"]."

// Close the connection


Hope you like this tutorial love to reply on your comments.

Author Huzoor Bux

I am Huzoor Bux from Karachi (Pakistan). I have been working as a PHP Developer from last 5+ years, and its my passion to learn new things and implement them as a practice. Basically I am a PHP developer but now days exploring more in HTML5, CSS and jQuery libraries.

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10 responses to “How to use MySQLi_connect in PHP”

  1. Husni's Elemento says:

    PDO is secure and faster

  2. Kieran says:

    I’d just like to point out the typo in mysqli_fecth_array, should be mysqli_fetch_array

  3. Giang Nguyễn Ngọc Trường says:

    mysqli_fetch_array have other parameter

    $result=mysqli_fetch_array($querry, RESULT_TYPE);

    result we have look like:
    id ======= name ==== class
    1 ======= giang ==== 19

    +MYSQLI_NUM: access result array =>> $result[0]=1 , $result[2]=19

    +MYSQLI_ASSOC: access result array =>>> $result[‘id’]=1, $result[‘name’]=giang

    +MYSQLI_BOTH: will create a single array with 2 attribute you can use $result[0]=1 or $result[‘id’]=1

    Just a few notes for who read this 🙂

  4. what does “or die” do during assignment and how come I can’t do “or thrown new Exception”?

  5. corona_mparker says:

    under “Connection error checking with object method:” you need to change “$db->” to “$sql->” in 2 places

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