apostrophe causing disappearing text

[mrnoisy]

I have a simple form that actions to itself with php_self and displays the submitted data in the input boxes.

Whenever the data contains an apostrophe, whatever is after the apostrophe disappears.

I've played around with addslashes() and stripslashes() but no luck.

input: Bob O'reilly

if(isset($_POST['form1']))
{
$lastname=($_POST['lastname']);
}

print "<form action='$php_self'>";
print "<input type='text' name='lastname' value='$lastname' />";
print "<input type='submit' name='form1' />";
print "</form>";

output: Bob O\

if(isset($_POST['form1']))
{
$lastname=($_POST['lastname']);
}

print "<form action='$php_self'>";
print "<input type='text' name='lastname' value='".stripslashes($lastname)."' />";
print "<input type='submit' name='form1' />";
print "</form>";

output: Bob O

[j4mes]

htmlspecialchars()

[mrnoisy]

Thanks for the heads up j4mes.

I'm not sure why, but I still have to stripslashes() on display to make it work.

input: Bob O'reilly

if(isset($_POST['form1']))
{
$lastname=htmlentities($_POST['lastname'], ENT_QUOTES);
}

print "<form action='$php_self'>";
print "<input type='text' name='lastname' value='".stripslashes($lastname)."' />";
print "<input type='submit' name='form1' />";
print "</form>";

output: Bob O'reilly

Now I'm trying to validate the input to characters found in a name besides letters, such as ' and - but the apostrophe is not validating.

((eregi('^[a-zA-Z \'-]{1,50}$', $lastname))

[mrnoisy]

OK I got it:

(ereg("^[\w]+([- ]{1}¦(\\\'))?[\w]+$", $lastname))