Outputing php to index page where it was called from

[9999]

On my index page I display the date and some "tips of the day" (tip.php-displayed in an iframe) derived from a delimited text file.

[code] <div align="center" 
<?php 
  echo date("<b>F j</b>"); 
?> 
</div> [/code] 

[code]<?php //tip.php This displays on the index page in an iframe 

$file = file('data.txt'); 
$today = getdate(); 

echo'<table style="width:400px; height:200px; padding:0px; border:0px"><tr><td>'; 
foreach ($file as $line => $data) 
{ 
    list($month, $day, $year, $tip) = explode('|', trim($data) ); 
 
    if ($today['month'] == $month AND $today['mday'] == $day)   
{ 
   
        echo '<font face="Times New Roman" size="2px">'. $tip .'</font>'; 
        echo "<p>"; 
   
  } 
} 
echo'</td></tr></table>'; 
?> [/code]


The iframe

html[code]<iframe name="iFrame1" width=425 height=225 src="tip.php" scrolling="auto" frameborder="0"></iframe>[/code]

After viewing that, the view would then be able to select another day of the year and go to that result:


html[code]<form action="select.php" method="POST">

<select name="month">
  <option value="January">January
            ***  thru ****
  <option value="December">December
</select>

<select name="day">
  <option value="1">1
        ***  thru ***
  <option value="31">31
</select>

  <input type="submit" name="Get Tip" value="Get Tip"/>
</form>[/code]

That form submission then posts to select.php which is here:

[code]<?php  // from select.php 

$monthselect = $_POST['month']; 
$dayselect = $_POST['day']; 

$file = file('data.txt'); 

echo'<table style="width:400px; height:200px; padding:0px; border:0px"><tr><td>'; 
foreach ($file as $line => $data) 
{ 
    list($month, $day, $year, $tip) = explode('|', trim($data) ); 
 
    if ($monthselect == $month AND $dayselect == $day)   
{ 
   
        echo '<font face="Times New Roman" size="2px">'. $tip .'</font>'; 
        echo "<p>"; 
   
  } 
} 
echo'</td></tr></table>'; 
?> [/code]

My problem is that this output is printed on a blank page. I want to display it as I do the original tip.php file that was displayed on my index page. I would prefer if this output was displayed on a regenerated index page. Any suggestions as to what code I would use? Using sessions was suggested but I don't know how I would implement that in my case. Is there another solution?

I am a newbir to both php and web developing.  I use two files instead of one and I use iframes because that is what I am comfortable with at this juncture.

Thanks in advance!