a simple example:
$array = array(
'0_1' => 'zero one',
'0_2' => 'zero two',
'0_3' => 'zero three',
'1_1' => 'one one',
'1_2' => 'one two',
'1_3' => 'one three',
'2_1' => 'two one',
'2_2' => 'two two',
'2_3' => 'two three'
);
foreach ($array as $key => $value)
{
$substr_key = substr($key, 0, 1);
$array2[$substr_key][] = $key . " = '" . addslashes($value) . "'";
}
foreach ($array2 as $value)
{
$sql = 'INSERT INTO table SET ' . implode(', ', $value);
echo $sql . '<br>';
}