DaniWeb IT Discussion Community - ugh! One Page, 2 re-loads (page request i guess)

i guess i didn't really have to make this page load repeatedly like this (but, why should it matter, right? i mean.. technically, couldn't i get it to reload indefinietly?) but, i didn't want the user to be sent all over to different pages just to fill out this little scheduing form thing.

i see already from the PHP code coloring that i've got something seriously wrong right around my midsection

i've spent so much time on this alone already, i could really use a fresh pair of eyes. i realize i probably should have tried to debug that section... but... what can ya do.. thanks for reading!
[php]<?php
ob_start();
session_start();
// START. IF FLOW IS EMPTY SCRIPT HALTS. schedule.php IS DISPLAYED
if (empty($_POST['flow'])) {

if (isset($_SESSION['flow'] && $_SESSION['flow'] = "go")) {

if (isset($_POST['op']) && ($_POST['op'] == "makedate")) {
// make the timestamp
$day = $_POST['day'];
$month = $_POST['month'] + 1;
$m = $month;
$year = $_POST['year'];
$year = $year + 2005;
$mkhour = $_POST['hour'];
$mkmin = $_POST['min'];

$check = checkdate($m, $day, $year);
if ($check == 1) {

$newtime = date("M-d-Y \a\\t h:i a", mktime($mkhour, $mkmin, 0, $month, $day, $year));
$tstime = mktime($mkhour, $mkmin, 0, $month, $day, $year);
$dynadate = "<p>READY TO MAKE THE DATABASE QUERY and move on!!!</p>";
$ready = 1;

} elseif ($check == 0) {
$ready = 0;
$dynadate = "<p>You entered an invalid date! Please <a href=\"schedule.php\">try again</a>:</p>";

}

}

header("Location: url("schedule.php"));
exit;
}
else { // CHECK FOR ['OP'] WHICH IS SET AFTER TIME IS SELECTED
}

} else if (isset($_POST['flow']) && ($_POST['flow'] == "go")) {

$dynadate = "";
$_SESSION['flow'] = $_POST['flow'];

if (isset($newtime, $_POST['op'], $day, $m, $month, $year, $_POST['day'])) {
} else { // THE IF ISSET W/ OUT FLOW SWITCHING IS USED TO SET THE VARIABLES FOR DYNADATE PULL-DOWNS ? can see no other purpose
}

// BEGIN MAKING HTML FORM
$dynadate .= "<h3>Select the Date for your Big Day!</h3>
<p class=\"specialmsg\"><strong>STOP!</strong> Before entering this date... Thanks for your cooperation!</p>
<form method=\"post\" action=\"$_SERVER[PHP_SELF]\">";

// MAKE MONTHS ARRAY
global $m;
$monthArray = array('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August',
'September', 'October', 'November', 'December');
$dynadate .= "<select name=\"month\">";
for ($m = 0; $m < count($monthArray)+1; $m++){
$dynadate .= "<option value=\"$m\">$monthArray[$m]</option>";
if ($m == 11) {
break;
} else {

}
}
$dynadate .= "</select>";

// MAKE DAYS ARRAY
$dynadate .= "<select name=\"day\">";
for ($x = 0; $days = $x+1; $x++){

$dynadate .= "<option value=\"$days\">$days</option>";
if ($x==30) {
break;
}
}
$dynadate .= "</select>";

// MAKE YEARS ARRAY
$yearArray = array('2005', '2006', '2007', '2008', '2009', '2010');
$dynadate .= "<select name=\"year\">";
for ($y = 0; $y < count($yearArray)+1; $y++){
$dynadate .= "<option value=\"$y\">".$yearArray[$y]."</option>";
if ($y == 5) {
break;
} else {
$yearnum = $y;
}
}

$dynadate .= "</select>";

// BEGIN TIME SECTION
$dynadate .= "<p class=\"specialmsg\">What time ... that day.</p>";
$hours = 24;
$min_sec = 60;

$hour = '<select name="hour">';
for($i=0; $i<=$hours; $i++){
$hour .= '<option value="'.$i.'">'.date('h (a)', mktime($i,0,0,1,1,2000)).'</option>';
}
$hour .= '</select>';

$min = '<select name="min">';
for($i=0; $i<=$min_sec; $i++){
$min .= '<option value="'.$i.'">'.date('i', mktime(0,$i,0,1,1,2000)).'</option>';
}
$min .= '</select>';

$dynadate .= "$hour.$min";

// $_POST['op'] = makedate
$dynadate .= "<input type=\"hidden\" name=\"op\" value=\"makedate\"/>
<br /><input type=\"submit\" name=\"submit\" value=\"Enter Date\" /></form>";

} // END THE QUITE LENGTHY DATE-DROP-DOWN FORM THING
else {
header("Location: url("schedule.php"));
exit;
} echo $dynadate; {
}

?>
<html>stuff</html>
<?php

if empty($ready) {

echo $dynadate;
}

?>[/php]
by the way-- sorry to be that guy who comes in and posts a crack-load of code, lookin for answers the cheap and easy way. i welcome anyone w/ beginner to moderately complex inquiries to PM me if you need to get un-stuck from somwhere. as you can see from this code, i ain't that good, but i do know what a lot of it is supposed to do. heehee

EDIT: if this seems a little schizophrenic, it's because i chopped the date dropdown stuff right out of something i did about a year ago... there's one part in there, i was like... 'huh?'-- where the if isset(...) doesn't really do anything... i left it there cause i was being lazy-- thinking it was some BandAid i put over some other part which was poorly structured. the whole date thing is heavily influenced by helpers in another great forum.