Doc: https://www.php.net/manual/en/ref.pdo-firebird.php

sudo apt install php-interbase

Ceci installe également les librairies clientes pour l'accès à Firebird.

sudo vi /etc/php/7.4/apache2/php.ini

extension=pdo_firebird

sudo systemctl reload apache2.service

<?php
 
$dbname = 'firebird:dbname=servername:/path/to/database.fdb';
$dbuser = 'sysdba';
$dbpass = '******';
 
try {
 
    // Connexion
    $db = new \PDO($dbname, $dbuser, $dbpass, [
        \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION
    ]);
 
    ...
 
    // Déconnexion
    $db = null;
}
catch(\PDOException $e) {
    echo $e->getMessage();
}

$res = $db->query("SELECT nom, prenom FROM personnel;");
 
if($res !== false) {
    foreach($res as $row) {
        echo $row['NOM'];
        echo $row['PRENOM'];
    }
}