如何创建管理端,将产品添加到我的数据库? [重复]

This question already has an answer here:

I am trying to add products to my database. I am creating a PHP page to allow me to select the artist by name or enter a new one, upload an image, and enter the details of the product.

When I run my code, I am not getting no where forward.
I get an error on this line of my code:

<p>
  <b>Print Name: </b> 
  <input type="text" name="print_name" size="30" maxlength="60"
      value="<?php if (isset($_POST['print_name']))
                       echo htmlspecialchars($_POST['print_name']);?>" />
</p>

The error is:

Parse error: syntax error, unexpected '' (T_ENCAPSED_AND_WHITESPACE), expecting identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING

</div>

Your code should be like below :

<p>
  <b>Print Name: </b> 
  <input type="text" name="print_name" size="30" maxlength="60" value="<?php echo (isset($_POST['print_name'])) ? htmlspecialchars($_POST['print_name']) : '' ;?>"
/>
</p>

You are using Unary operator in wrong way :

The structure of unary is :

<?php echo (condition) ? true : false ; ?>

You can try this you have to start and over curly brackets

<input type="text" name="print_name" size="30" maxlength="60"  value="<?php if (isset($_POST['print_name'])){
echo htmlspecialchars($_POST['print_name']);}?>">