I am trying composer autoload but error above

[mymac1]

Fatal error : Class ‘Fontana\PolisCarHire\PDO’ not found in F:\htdocs_xampp\PDO_www.poliscarhire.com\src\MyPDO.php on line 4

I am trying composer autoload but error above, how to include PDO in the composer autoload

index.php

<?php
require_once('vendor/autoload.php');

try{
  $db = new Fontana\PolisCarHire\MyPDO();
  
  $mysecuredata = 150;

  $sql = 'SELECT name, color, calories FROM fruit ORDER BY name';

  foreach ($db->query($sql) as $row) {
      print $row['name'] . "\t";
      print $row['color'] . "\t";
      print $row['calories'] . "\n<br>";

composer.json

{
    "license": "MIT",
    "require": {
        "php": "^7.2"
    },
    "require-dev": {
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true
    },
    "autoload": {
        "psr-4": {
            "Fontana\\PolisCarHire\\": "src/"
        }
    }
}

src/MyPDO.php

<?php
namespace Fontana\PolisCarHire;

class MyPDO extends PDO  // line 4
{
    public function __construct

[m_hutley]

(Preface: I don’t know composer. My knowledge for this post derives from the following link:)

PHP composer autoload | PHPenthusiast

According to the above page, you’ve forgotten to tell your index page to Import the namespace. (Step “e” under using PSR-4 in the above link.)

[mymac1]

how import with “use …” a build-in library like PDO…?

[m_hutley]

Well you’re not using a built in library; you wrote your own class. So now you have to import the namespace of the class you created.

[rpkamp]

Did you run composer install after modifying composer.json? You need to do that in order to update the autoloader with your custom configuration.

[mymac1]

class MyPDO extends PDO  
{
    public function __construct

PDO is a SPL class i think included in 5.6, 7.x PHP
The code works using PDO extends my class WITHOUT composer and namespaces

How use PDO with composer and namespaces?

[rpkamp]

<?php
namespace Fontana\PolisCarHire;

use PDO;

class MyPDO extends PDO  // line 4
{
    public function __construct

[rpkamp]

I would however like to add that instead of extending PDO, you can create a lot more flexible design if you instead create class that accepts a PDO instance as constructor argument.

[mymac1]

yes thank you worked

I used the

<?php use PDO;