Puoi fare cosi. E' anche possibile farlo con il DOM.
codice:
<?php
if (isset($_POST)) {
//print_r($_POST);
//------- Valori delle variabili pippo
if (isset($_POST['pippo'])) {
$arrPippo = $_POST['pippo'];
foreach($arrPippo as $key => $value) {
print "indice $key - valore immesso $value
";
} // foreach($arrPippo as $value)
} // if (isset($_POST['pippo']) )
} // if (isset($_POST))
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled</title>
<script language="JavaScript" type="text/javascript">
<!--
indexVar = 0;
function addField(){
//--------- Salvo i valori già immessi
var savPip = new Array();
var i = 0;
for (i=0;i<indexVar-1;i++) {
varName = 'pippo['+i+']';
savPip[i] = document.getElementById(varName).value;
} // for (i=0;i<indexVar-1;i++)
//--------- Assegno un nuovo campo
newVar = '<input type="text" id="pippo['+indexVar+']" name="pippo['+indexVar+']" size="20" maxlength="50" />
';
document.getElementById('divForm').innerHTML += newVar;
//--------- Ripristino i valori
for (i=0;i<indexVar-1;i++) {
varName = 'pippo['+i+']';
document.getElementById(varName).value = savPip[i]
} // for (i=0;i<indexVar-1;i++)
indexVar++;
}
//-->
</script>
</head>
<body>
<form action="test2207.php" method="post">
<div id="divForm">
</div>
<input type="submit" name="invia" value="Invia"/>
</form>
<input type="button" value="AddField" onclick="addField()" />
</body>
</html>