Question

我现在尝试使我的代码更具用户功能，并从函数中删除我的全局变量，也使用mysqli而不是mysql。当用户已经在数据库中时，我无法纠正错误。

当我将用户添加到数据库（谁不在我的数据库中）时。我的数据库已更新，我的回声输出符合预期：

There are no empty Form Input Fields
christest@allcoles.com WAS NOT found in the table: emailUser field: username 
DOB is: 2009-02-12
christest@allcoles.com has been added to the Webmail Database
Database is Closed.
End of Registration.

当我开始一个新会话并尝试添加相同的用户名时，我得到：

There are no empty Form Input Fields
Warning: mysqli_error() expects exactly 1 parameter, 0 given in /hermes/bosoraweb033/b1714/ipg.allcolescom/_webmail/mailDB.php on line 75

我期望得到的是：

There are no empty Form Input Fields
There is already a user registered with this username.  Please try a different one.
Database is Closed.
End of Registration.

第75行（这是我的checkInField函数）：

if (!$row = mysqli_fetch_array($result) or die(mysqli_error()))

完整的代码在这里：

//Main Code Sequence
error_reporting(-1);
ini_set('display_errors',1);

//Database Setup    
$db_host = "***";
$db_name = "***";
$db_table = "emailUser";
$db_username = "***";
$db_password = "***";
$mysqli_db = new mysqli($db_host,$db_username,$db_password,$db_name);


function webmailForgottenPassword() //The function for the website FORGOTTEN PASSWORD FORM
{
    // Code to be added
}

function webmailSignUp($db_connection,$db_con_table) //The function for the website REGISTER FORM
{
    $webmailFullName = $_POST['webmailFullName'];
    $webmailUserName = $_POST['webmailUserName'];
    $webmailExEmail = $_POST['webmailExEmail'];
    $webmailPhone = $_POST['webmailPhone'];
    $webmailDOB = $_POST['webmailDOB'];

    //Check that the fields are not empty
    if (checkBlankFieldsError($webmailFullName,$webmailUserName,$webmailExEmail,$webmailPhone,$webmailDOB) == false)
    {   
        echo "There are no empty Form Input Fields<br>";

        //Check that there is no existing name in the table
        if (checkInField($webmailUserName,$db_connection,$db_con_table,"userName") == false)
        {

            //Check DOB Field
            $dob = convertDate($webmailDOB);
            echo "DOB is: $dob<br>";

            //Binding and Query to prevent SQL injection
            $query = "INSERT INTO $db_con_table(userFullName,userName,userExEmail,userPhone,userDOB) VALUES(?,?,?,?,?)";                    
            $requery = $db_connection->prepare($query);
            $requery->bind_param("sssss",$webmailFullName,$webmailUserName,$webmailExEmail,$webmailPhone,$dob);


            if ($requery->execute())
            {
                echo "$webmailUserName has been added to the Webmail Database<br>";
            }
            else
            {
                echo "bind failed on $webmailUserName <br>";
            }   
        }
        else
        {
            echo "There is already a user registered with this username.  Please try a different one.<br>";
        }
    }
    else
    {
        echo "There is 1 or more empty input fields. Please try again.<br>";
    }
    $db_connection->close();
    echo "Database is Closed.<br>";
}

function checkInField($value,$db_connection,$db_con_table, $db_field)  // Checks a value is not within a database field
{
    $query = "SELECT $db_field FROM $db_con_table WHERE $db_field='$value' LIMIT 1"; 
    $result = mysqli_query($db_connection, $query) or die(mysqli_error());

    if (!$row = mysqli_fetch_array($result) or die(mysqli_error()))
    {
        echo "$value WAS NOT found in the table: $db_con_table field: $db_field<br>";
        return false;
    }
    else
    {
        echo "$value WAS found in the table: $db_con_table field: $db_field<br>";
        return true;
    }
}

function checkBlankFieldsError($field1,$field2,$field3,$field4,$field5) //Checks if form fields are blank
{
    $fields = array($field1,$field2,$field3,$field4,$field5);       
    $error = false;

    foreach($fields AS $fieldname)   //Loop trough each fieldname in the fields array
    {
        if(empty($fieldname)) 
        {
            $error = true;
        }
        else 
        {
        }
    }
    return $error;
}

function convertDate($aString) //Converts a String to a Date in Y-M-D format
{
    $date2 = DateTime::createFromFormat('m/d/Y', $aString);
    return $date2->format('Y-m-d');
}

//Main Code Sequence on form buttons
if(isset($_POST['webmailRegisterSubmit']))
{
    webmailSignUp($mysqli_db,$db_table);
    echo "End of Registration.<br>";
}
if(isset($_POST['webamilForgottenPWSubmit']))
{
    webmailForgottenPassword();
    echo "End of Password Reset Request.<br>";
}
?>

对于答案，请注意我处于初级阶段，因此很可能需要帮助才能理解原因。感谢您的时间。克里斯

Answer 1

使用 connection.php

<?php
$host = "localhost";
    $username = "";
    $password = "";
    $database = "";
$conn = mysql_connect($host, $username, $password) or die ("Could not connect");
$db = mysql_select_db($database, $conn) or die ("Could not select DB");
 ?>

和

if (!$row = mysqli_fetch_assoc($result) or die(mysqli_error())) or if (!$row = mysql_fetch_assoc (or) array($result) or die(mysqli_error()))

Answer 2

您好我找到了一种替代方法，可以使用while循环来保持mySQLi。

干杯克里斯

$mysqli_db = new mysqli($db_host,$db_username,$db_password,$db_name);

//The Call
if (checkInField($webmailUserName,$db_connection,$db_con_table,"userName") == false)
{
    echo "next part";
}   

//The Query to find a username from a column within a table within a database
//using mySQLi
function checkInField($value,$db_connection,$db_con_table, $db_field)  // Checks a value is not within a database field
{   
    $query = "SELECT $db_field FROM $db_con_table WHERE $db_field='$value'";
    $result = $db_connection->query($query) or die($mysqli->error());

    // GOING THROUGH THE DATA
    if($result->num_rows > 0) 
    {
        while($row = $result->fetch_assoc()) 
        {
            echo "User $value found: '$row[$db_field]' in the table $db_con_table column $db_field<br>";
            mysqli_close($db_connection);
            return true;
        }
    }
    else
    {
        echo "User $value has not been found in the table $db_con_table column $db_field<br>";
        mysqli_close($db_connection);   
        return false;
    }
}

返回错误mysqli_error（）正好需要1个参数，0

2 个答案: