为什么从表单发送的存储textarea数据中添加了额外的换行符

Question

I have a Textarea with this in it:

Test can't talk<br />
Test

When I send it to my preview page I use this:

$Comments = htmlspecialchars("$_POST[CustComments]", ENT_QUOTES);
$Comments = str_replace("
","<br />", $Comments);

It then shows this on the preview page:

Test can't talk<br />
Test

When I go back to edit it, in the edit page code I have this.

$Comments = str_replace("<br />","
", $_POST['CustComments']);
$Comments = htmlspecialchars($Comments, ENT_QUOTES);

But it shows this:

Test can't talk

Test

Where is this extra break coming from and how do I get rid of it?

---

UPDATE: Per a suggestion on the edit page I have this.

$Comments = htmlspecialchars($_POST['CustComments'], ENT_QUOTES);

And that shows this:

Test can't talk
<br />Test

Again where is this extra <br /> coming from? If I use strreplace it will show like this

Test can't talk

Test

Using just this:

$Comments = nl2br($_POST['CustComments']);

It shows this:

Test can't talk<br />
<br />Test

Again a random <br /> is added.

Answer 1

On the view page need to use this:

$Comments = htmlspecialchars("$_POST[CustComments]", ENT_QUOTES);
$Comments = str_replace("
","<br />",$Comments);

On the edit page use this:

$Comments = str_replace("<br />","
",$_POST['CustComments'])

On the submission page:

function keepSafe($value) {
    if (get_magic_quotes_gpc()) {
        $value = stripslashes($value);
    }
    if (!is_numeric($value)) {
        $value = "'" . mysql_real_escape_string($value) . "'";
    }
    return $value;
}
$Comments = keepSafe($_POST['CustComments']);

Works like a charm.