Pass variables between two PHP pages

Page1.php {FORM NAME ="form1" METHOD ="POST" ACTION ="page2.php"} <?php $file1 = 424241; ?> <?php $file2 = 424242; ?> <?php $file3 = 424243; ?> <?php $file4 = 424244; ?> <?php $file5 = 424245; ?> <?php $file6 = 424246; ?> <?php $file7 = 424247; ?> <?php $file8 = 424248; ?> <?php $file9 = 424249; ?> <?php $file10 = 4242410; ?>

<?php $i=1; ?>

<?php for ($i=1; $i <= 10; $i++) { ?>

{Input type = 'Checkbox' Name ='checkbox<?php echo $i; ?>' value = '<?php echo ${'file'.$i}; ?>' uncheked } UserID

{INPUT TYPE = "Submit" Name = "Submit1" VALUE = "What ID"} {/FORM}

<?php for ($i=1; $i <= 10; $i++) { ?> <?php if (isset($_POST['Submit1'])) { if (isset($_POST['checkbox'.$i])) { echo ${'chi'.$i} = $_POST['checkbox'.$i] ; } } ?>

Page2.php <?php

    echo $_POST['checkbox1'] ;
            echo "<br/>";
            echo $_POST['checkbox2'] ;
            echo "<br/>";
            echo  $_POST['checkbox3'] ;
            echo "<br/>";

?> I have replace the <> with {} as when i put < for HTML code > it will not display correctly.

Here the question: Right now page1.php is looping 10 times. Let said page1.php looping times is a variable, it might be change to 15 times or even more. therefore I do not want to type manually on page2.php to echo out the value of checkbox.

if page1.php suddenly looping 15 times then page2.php also looping 15 times how can i make sure the two pages of php is looping same times? appreciate if you can give me some idea

Best Regard