return to new post page with post content ?

Hello i am working about a articles script

i have a small problem in new post page ( new_post.php )

my form page

<form>
input name = "post_title"
textarea = "post_content"
</form>

in my proccess page i have ( php if statment )

example

if(empty($_POST['post_title]){
$_SESSION['error'] = 'Titl开发者_如何学Pythone field is empty !';
header("location: newpost.php");
}

it's working fine

but the problem is

i lost the post data if the system redirected me !

sorry for my language but i mean

the data i have writed in the text area of the post content is lost if the system redirected me to the new post page !

so , how i can keep this data without lost after redirecting ?

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Save the post data to a $_SESSION variable (or array) before redirecting. That way, you can recall it later.

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You could avoid redirecting by using a php function to display your form. That way you could simply pass the values as arguments to the function.
function showForm($title="", $content=""){
{display form using the arguments as values for each form field}
}