PHP HTML Heredoc Parse错误：语法错误，意外'''

Question

So I'm writing HTML code for form inside my PHP block like below: Add New Record in PostgreSQL Database .error {color: #FF0000;}

$con= pg_connect("host=$host port= $port dbname=$db user=$user password=$pass") 
    or die ("Could not connect to server
");
if(empty($_POST['title']))
{
    $titleErr= "Title is required";
    displayForm();
}
else
{
    processForm();

}
}

else
{
displayForm();
}

function processForm(){
$title = $_POST['title'];
$author = $_POST['author'];
$status = $_POST['status'];
$remark = $_POST['remark'];
$story = $_POST['story'];
$art = $_POST['art'];
if($story=='')
{
$story=0;
}
if($art=='')
{
$art=0;
}

$query = "INSERT INTO rating ".
   "(title,author,story,art, status, remarks) ".
   "VALUES('$title','$author',$story, $art,'$status','$remark')";
$rs= pg_query($con, $query) or die ("Cannot execute query:$query because".pg_last_error()."
");

/************************************************
Save uploaded image in server
************************************************/
echo "Entered data successfully
";
pg_close($con);
}

function displayForm()
{
print<<<END
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" enctype="multipart/form-data">
<table width="400" border="0" cellspacing="1" cellpadding="2">
<tr>
<td width="100">Title</td>
<td><input name="title" type="text" id="title"><span class="error">* <?php echo $titleErr;?></span></td>
</tr>
<tr>
<td width="100">Author</td>
<td><input name="author" type="text" id="author"></td>
</tr>
<tr>
<td width="100">Story Rating</td>
<td><input name="story" type="text" id="story"></td>
</tr>
<tr>
<td width="100">Art Rating</td>
<td><input name="art" type="text" id="art"></td>
</tr>
<tr>
<td width="100">Remarks</td>
<td><input name="remark" type="text" id="remark"></td>
</tr>
<tr>
<td width="100">Status</td>
<td><input name="status" type="text" id="status"></td>
</tr>
<tr>
<td width="100">Image</td>
<td><input name="file" type="file" id="file"></td>
</tr>
<tr>
<td width="100"> </td>
<td> </td>
</tr>
<tr>
<td width="100"> </td>
<td>
<input name="add" type="submit" id="add" value="Add Entry">
</td>
</tr>
</table>
</form>
END;
}
?>
</body>
</html>

In the function displayForm(), I keep getting this error: Parse error: syntax error, unexpected '"', expecting identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING), specifically in this line: " enctype="multipart/form-data">

I made sure already there's no leading space at the closing of the Heredoc and the beginning of the Heredoc, and I can't find any solution on the net. What I'm trying to achieve is displaying the error message besides the required fields after the user click submit (display the form once again, now with error message). Please suggest me a solution on this as well in case the structure of my code is wrong.

Answer 1

You should encapsulate your indexed variable like this inside your quoted string or heredoc: {$_SERVER["PHP_SELF"]}

But that is not your only problem. Your next problem is that you are trying to open a <?php tag inside the heredoc. Though this should not give you an error, it will also not work. You are already inside PHP! So this will just literally output that code.

You can use variables within heredoc as I already stated. If it's an indexed variable (meaning it uses []), use curly braces {} around the variable. But you cannot call functions (such as htmlspecialchars()) from within the heredoc. Call the function before you start your heredoc. (edit: As Marcin Nabialek shows us in his answer, there is a work-around to call functions from within the heredoc. But you then have to first put the function name in another variable again.)

So what you need to do is change :

print<<<END
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" enctype="multipart/form-data">

into:

$phpself = htmlspecialchars($_SERVER["PHP_SELF"]);
print<<<END
<form method="post" action="$phpself" enctype="multipart/form-data">

And change:

<td><input name="title" type="text" id="title"><span class="error">* <?php echo $titleErr;?></span></td>

into:

<td><input name="title" type="text" id="title"><span class="error">* $titleErr</span></td>