echo back array variables to html form when submitting

echo back array variables to html form when submitting

After alot of digging around some very informative posts and info to try
and find out how to solve this issue I thought I would ask around to see
if anyone has any pointers. I have an html form with various inputs
(checkboxes, text boxes etc...). Each input section has its own submit or
'Upload' button. On Upload a php script is called and various bits of
processing is done before data is sent over a pipe to a Python script for
further stuff. I am currently echoing back input variables to the form on
submission so that the html page does not refresh (or should I say the
inputted data is not lost to the users view) on an Upload event, however,
I now have to do the same for a bunch of checkboxes and text boxes the
values of which are stored in an array. The code I have written so far is
as follows (I am new to both php and html so please excuse the
inefficiency that I'm sure is obvious)
html/php
<margin>CH1</margin><input type="checkbox"name="ANout[]"value="AN1_OUT"
<?php if(in_array('AN1_OUT',$_POST['ANout']))echo'checked';?>>
Voltage<input type="text"size="5"name="ANout[]"
value="<?php $ANout[$i]=$_POST['ANout'];
if(!empty($ANout[$i]))echo"$ANout[$i]";?>">
<br>
The code above works fine for the checkboxes which happily remain after an
Upload button is pressed but not for the array. When the Upload event
occurs I simply get 'Array' written in the text box. I have tried existing
code I have written to echo back other text input in the form (see below)
and which works but these are for sole entries, not arrays. I have tried
various configurations of syntax but I always seem to get the same result.
Working Code:
<margin>Duty Cyle</margin><input type="text"name="PWM1DC"size="3"
value="<?php $PWM1DC = $_POST['PWM1DC'];
if(!empty($PWM1DC))echo "PWM1DC";?>">
<br>
Any clues would be appreciated.