Try getenv in config/DataAccess.php

config/DataAccess.php

@@ -1,10 +1,10 @@
 <?php
 class DataAccess
 {
-    private $host = $_ENV["TZ_HOST"];
-    private $username = $_ENV["TZ_USER"];
-    private $password = $_ENV["TZ_PASSWORD"];
-    private $dbname = $_ENV["TZ_NAME_DATA_BASE"];
+    private $host = getenv("TZ_HOST");
+    private $username = getenv("TZ_USER");
+    private $password = getenv("TZ_PASSWORD");
+    private $dbname = getenv("TZ_NAME_DATA_BASE");
 
     private $conection;
 
@@ -26,4 +26,4 @@ class DataAccess
         $this->conection->close();
     }
 }
-?>
+?>

public/index.php

@@ -17,9 +17,6 @@
     <div class="fond"></div>
     <div class="content ani-bounce">
         <h1>TURITEZO</h1>
-        <?php echo getenv("TZ_HOST") ?>
-        <br>
-        <?php echo $_ENV["TZ_HOST"] ?>
     </div>
 </body>