Create php function automate code lines

By Kamikaze

guys, I currently use the following code to run a query pdo. Note that I type “SELECT * FROM PRINTERS”. But how do I create a function where I put my querys and just call them via function. It does not have to be the result, it would just be the query itself.

functions.php

<?php
        function db_connect()
        {
     $PDO = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME .     ';charset=utf8', DB_USER, DB_PASS);
   $PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
   return $PDO;
   }
    function make_hash($str)
      {
  return sha1(md5($str));
   }
    // verica se está logado
    /**
  * Verifica se o usuário está logado
  */
     function isLoggedIn()
    {
 if (!isset($_SESSION['logged_in']) || $_SESSION['logged_in'] !== true)
{
    return false;
}
return true;
  }

index.php ( where i run querys )

    <?php
     require('functions.php');
     ?>

Source: Stack Overflow

    

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