Use sessions
<?php
session_start();
// your fomrfields
$post_fields = array( 'key_one', 'key_two', 'key_three' );
$form_data = array();
// copy needed form data from $_POST array
foreach ( $post_fields as $key )
if ( isset( $_POST[$key] )
$form_data[$key] = $_POST[$key];
// save your form data in a session if no form data was saved before
if (
! empty( $form_data )
&&
! isset( $_SESSION['form_data'] )
)
$_SESSION['form_data'] = serialize( $form_data );
// read saved form data from session
if (
isset( $_SESSION['form_data'] )
&&
! empty( $_SESSION['form_data'] )
&&
empty( $form_data )
)
$form_data = unserialize( $_SESSION['form_data'] );
From now on use $form_data[key]
instead of $_POST[key]
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