理解第 32 行中的 ssssii

Question

我正在查看从 YouTube 获得的这段代码，以帮助我理解将 PHP 连接到 MySQL

<?php
$username = $_POST['username'];
$password = $_POST['password'];
$gender = $_POST['gender'];
$email = $_POST['email'];
$phoneCode = $_POST['phoneCode'];
$phone = $_POST['phone'];
if (!empty($username) || !empty($password) || !empty($gender) || !empty($email) || !empty($phoneCode) || !empty($phone)) {
 $host = "localhost";
    $dbUsername = "root";
    $dbPassword = "";
    $dbname = "youtube";
    //create connection
    $conn = new mysqli($host, $dbUsername, $dbPassword, $dbname);
    if (mysqli_connect_error()) {
     die('Connect Error('. mysqli_connect_errno().')'. mysqli_connect_error());
    } else {
     $SELECT = "SELECT email From register Where email = ? Limit 1";
     $INSERT = "INSERT Into register (username, password, gender, email, phoneCode, phone) values(?, ?, ?, ?, ?, ?)";
     //Prepare statement
     $stmt = $conn->prepare($SELECT);
     $stmt->bind_param("s", $email);
     $stmt->execute();
     $stmt->bind_result($email);
     $stmt->store_result();
     $stmt->store_result();
     $stmt->fetch();
     $rnum = $stmt->num_rows;
     if ($rnum==0) {
      $stmt->close();
      $stmt = $conn->prepare($INSERT);
      $stmt->bind_param("ssssii", $username, $password, $gender, $email, $phoneCode, $phone); //line 32
      $stmt->execute();
      echo "New record inserted sucessfully";
     } else {
      echo "Someone already register using this email";
     }
     $stmt->close();
     $conn->close();
    }
} else {
 echo "All field are required";
 die();
}
?>

我的问题是第 32 行的“ssssii”是做什么的？

还有什么值 (?,?,?,?,?,?) 在 $insert for?

来源：Code and Coins YouTube。

Answer 1

这是准备好的声明。 S 是字符串 i 是整数。 (?,?,?,?) 是为了让脚本知道在哪里将参数绑定到

理解第 32 行中的 ssssii

Understanding ssssii in line 32

php

mysqli