Sticky form undefined offset - php

Question

I have a 5x2 HTML table: http://jsfiddle.net/duxTU/
The table is enclosed in a form.
When the form is submitted it redirects to same page
The input field values are stored in an associative array
The values are displayed in respective fields where they were initially entered.
Code:
<?php
if(isset($_POST['submit'])) {
$contacts_array array(
$_POST["name1"] => $_POST['name2'],
$_POST["name3"] => $_POST['name4'],
$_POST["name5"] => $_POST['name6'],
$_POST["name7"] => $_POST['name8'],
$_POST["name9"] => $_POST['name10']);
$array_filtered=array_filter($contacts_array);
$arrayKeys = array_keys($array_filtered);
$arrayValues = array_values($array_filtered);
}
?>
The array has been filtered to omit null values that may creep in.
Now, how do I make the the HTML form display values? I know about sticky forms but since i must keep the form size constant(5x2), I am trying to use code similar to following
<input type="text" value="<?php echo $arrayKeys[0]; ?> ">
<input type="text" value="<?php echo $arrayValues[0]; ?> ">
... till $arrayKeys[4] and $arrayValues[4], respectively.
This gives me undefined offsets, for example $arrayKeys[5] was not set as no value was entered in the respective form column before submission.
Any solution to this issue??

Answer 1

Maybe this would work for you:
<?php
function getPost($param){
return isset($_POST[$param])?$_POST[$param]:"";
}
?>
<form action="#" method="post">
<table>
<tr>
<td>Name</td><td>Age</td>
</tr>
<tr>
<td><input type="text" name="name1" value="<?= getPost("name1") ?>"></td>
<td><input type="text" name="name2" value="<?= getPost("name2") ?>"></td>
</tr>
<tr>
<td><input type="text" name="name3" value="<?= getPost("name3") ?>"></td>
<td><input type="text" name="name4" value="<?= getPost("name4") ?>"></td>
</tr>
<tr>
<td><input type="text" name="name5" value="<?= getPost("name5") ?>"></td>
<td><input type="text" name="name6" value="<?= getPost("name6") ?>"></td>
</tr>
<tr>
<td><input type="text" name="name7" value="<?= getPost("name7") ?>"></td>
<td><input type="text" name="name8" value="<?= getPost("name8") ?>"></td>
</tr><tr>
<td><input type="text" name="name9" value="<?= getPost("name9") ?>"></td>
<td><input type="text" name="name10" value="<?= getPost("name10") ?>"></td>
</tr>
<tr>
<td><input type="submit" value="submit" name="submit"></td>
</tr>
</table>
</form>
The getPost helper was created because I didn't want to have to type the conditional every time.
You can filter out the nulls for whatever other form processing you are doing.

Answer 2

If you just want to display values, a foreach would work great:
foreach ($array_filtered as $k=>$v) {
echo "<input type='text' value='".$k."'>";
echo "<input type='text' value='".$v."'>";
}
foreach loops through an array. $k is the current key. $v is the current value.
Of course, this should be inside of your form HTML.