尝试通过表单输入在PHP中写入.txt时出现空白文件

Question

I cannot seem to figure out why my order.txt file is blank despite seemingly having my logic correct. I'm new to PHP, so I apologize if I have obvious syntax errors.

I'm attempting to log the user input values of a form to a .txt file once the submit button is clicked. Here is my code: NOTE: both my form and php script are in the same file, so the action is referring to itself.

HTML:

<form action="p1_checkout.php" method = "POST">
      First name:<br>
      <input type="text" name="firstname"><br>
      Last name:<br>
      <input type="text" name="lastname"><br>
      Street Address:<br>
      <input type="text" name="streetaddress"><br>
      City:<br>
      <input type="text" name="city"><br>
      State:<br>
      <input type="text" name="state"><br>
      Zip Code:<br>
      <input type="text" name="zipcode"><br>
      Phone Number:<br>
      <input type="text" name="phonenumber"><br>
      Order Quantity:<br>
      <input type="text" name="orderquantity"><br>
      <input type="submit" value="Checkout">
</form>

PHP:

       <?php
            $newfile = fopen("order.txt", "w+");
            $fproduct = "Product: Mount Diablo, California Print";
            $fqty = "Quantity Ordered: ".$_POST['quantityordered'];
            $fname = "Person Billed: ".$_POST['firstname'];
            $faddress = "Address: ".$_POST['streetaddress'] + "," + $_POST['city'] + "," + $_POST['state'] + "," + $_POST['zipcode'];
            $fcontent = $fproduct + $fqty + $fname + $faddress;
            fwrite($newfile, $content);
            fclose($newfile);
        ?>

Answer 1

You try to use arithmetic operators

You need to concatenate vars, not add them.

this :

 $fcontent = $fproduct + $fqty + $fname + $faddress;

should be:

 $fcontent = "$fproduct $fqty $fname $faddress";

then write content to file:

fwrite($newfile, $fcontent); // you have typo, missing `f`

Make sure all $_POST values are ok though

EDIT: make sure $_POST values are correctly spelled : you use different name in form and in post result ->

$_POST['quantityordered'] != name="orderquantity" (in form)

and get rid of all arithmetic operators !

$faddress = "Address: ".$_POST['streetaddress'].", ".$_POST['city'].",". $_POST['state'] ."," .$_POST['zipcode'];