如何使用 php 将日期从 html 表单插入数据库？

Question

I have an HTML form which takes in details of a project and details like start date and deadline, When I tried to push the data from the form to the database, I am getting an error which says that my date field is empty, I am using PHP to push the data. I will give the code for HTML and PHP below. I recently started learning to code using PHP and SQL so any tips and advice are welcome. I have checked other forums but none of them explains how to insert date.

<form action="includes/sale.inc.php" method="POST">
    <input type="text" name="orderno" placeholder="Order No" required="required" />
    <input type="date" name="date" placeholder="Order Placed on" required="required" />
    <input type="text" name="item" placeholder="Description of goods" required="required" />
    <input type="text" name="qty" placeholder="Quantity" required="required" />
    <input type="date" name="ddate" placeholder="Due date" required="required" />
    <input type="text" name="rate" placeholder="Price" required="required" />
    <button type="submit" name="sale_submit" class="btn btn-primary btn-block btn-large">Submit</button>
</form>

<?php

if (isset ($_POST['sale_submit'])) {
    require 'saledbh.inc.php' ;
    $orderno = $_POST['orderno'];
    $dateplaced = date("Y-m-d H:i:s", $_POST['date']);
    $item = $_POST['item'];
    $qty = $_POST['qty'];
    $datedue = date("Y-m-d H:i:s", $_POST['ddate']);
    $price = $_POST ['rate'];

    if (empty($orderno)){
        header("Location: ../soentry.php?error=emptyorder");
        exit();
    }
    elseif (empty($item)){
        header("Location: ../soentry.php?error=emptyitem");
        exit();
    }
    elseif (empty($qty)){
        header("Location: ../soentry.php?error=emptyqty");
        exit();
    }
    elseif (empty($duedate)){
        header("Location: ../soentry.php?error=emptyddate");
        exit();
    }
    elseif (empty($price)){
        header("Location: ../soentry.php?error=emptyprice");
        exit();
    }
    elseif (empty($dateplaced)){
        header("Location: ../soentry.php?error=emptydate");
        exit();
    }
    else {
        $sql = "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'salesrecords' AND table_name = ?;";
        $sql1 = "INSERT INTO $orderno (orderno=? ,dplaced=?,item=?,qty=?,ddue=?,price=?);";
        $stmt = mysqli_stmt_init($conn);
        if (!mysqli_stmt_prepare($stmt, $sql)) {
            header("Location: ../soentry.php?error=sqlerror");
            exit();
        }
        else {
            mysqli_stmt_bind_param($stmt, "s",$orderno);
            mysqli_stmt_execute($stmt);
            $result = mysqli_stmt_get_result($stmt);
            if($result1 = mysqli_fetch_assoc($result)){
                if ($result == 0){
                    $sqlcreate= "CREATE TABLE $orderno (
                        ID int(11) AUTO_INCREMENT,
                        orderno varchar(255) NOT NULL,
                        dplaced date NOT NULL,
                        item varchar(255) NOT NULL,
                        qty int(11) NOT NULL,
                        ddue date NOT NULL,
                        price int(255) NOT NULL,
                        PRIMARY KEY (ID)
                        );";
                    }
                else {
                    header("location: ../soentry.php?error=notablecreate");
                }
                }
            else{
                header("location: ../soentry.php?=nofetchassoc");
            }
            }
        }
    }
else{
    header("location: ../soentry.php?error=noice");
    exit();
}
?>

Answer 1

First of all use the isset to check if a post variable is set before assigning it to a variable. This can be done like so:

PHP 7 +

$var = $var ?? "default value";

Before PHP 7

$var = isset($var) ? $var : "default value";

This will make sure you have no empty fields, however it will set a default value so in case your post value is indeed empty, the value will be different from the post.

I used your code in my test environment and copied the exact same code like you have to see if my post date gets through. For myself it did work and the check if a post is set would prevent you from getting an error.

If you want to troubleshoot more for yourself to see if your date is included in your post or something else might be the issue I suggest putting the next line of code before executing the command:

exit('<pre>' . print_r($_POST,1));

This will give you a clear overview on your posted variables.