PHP和数据库连接与串联

Question

嗨，我在插入数据库（postgres）时遇到问题：

这是我的input.php（我将其用于连接并插入到DB中）：

<?php
$conn = @pg_connect("dbname=postgres user=postgres password=123456789");
if(!$conn) {
    die('Connessione fallita !<br />');
} else {
    echo 'Connessione riuscita !<br />';
}
// Richiedente
$name = $_POST['name'];
$surname = $_POST['surname'];
$email = $_POST['email'];
$testo = $_POST['testo'];
// Interni
if($_POST['iname']) foreach($_POST['iname'] as $iname) 
if($_POST['isurname']) foreach($_POST['isurname'] as $isurname)
if($_POST['iemail']) foreach($_POST['iemail'] as $iemail)
// Esterni
if($_POST['ename']) foreach($_POST['ename'] as $ename) 
if($_POST['esurname']) foreach($_POST['esurname'] as $esurname)    
if($_POST['eemail']) foreach($_POST['eemail'] as $eemail)
//inserting data order
"INSERT INTO prenotazioni  (nome_rich, cognome_rich, email_rich,oggetto_rich)
            VALUES ('$name','$surname', '$email','$testo')";

"INSERT INTO interni (nome_int, cognome_int, email_int)
            VALUES ('$iname','$isurname','$iemail')";

"INSERT INTO esterni  (nome_est, cognome_est, email_est)
            VALUES  ('$ename','$esurname','$eemail')";
?>

我收到此错误：

  

致命错误：未捕获错误：调用C：\ xampp \ htdocs \ Project \ input.php：6中未定义的函数pg_connect（）堆栈跟踪：＃0 {main}抛出C：\ xampp \ htdocs \ Project \第6行的input.php