looping

ok, first of all, I need to validate the contents of an array. If there are any "errors" I need to report those "errors" (the contents of the array) to a text file along with the date and time the errors were written.
I need to use a loop function to go through the array and pick out any errors.
Anyone have an idea of which loop I could use?
I tried using the for() loop but that didn't work because it didn't know when to stop.
it needs to be in 2 pages.
Here's what I've got so far:

<?php
//page3.php
if ($_GET['filename'])
	{
	
	$file = "./courses/".$_GET['filename'];
	if (file_exists($file)){
	
	$readfile = file($file);
	
		foreach ($readfile as $string)
		{
		list($num, $last, $first, $email) = explode(',', $string);
		}
		
		//insert loop here 
		(
		require_once("./page4.php");
		isStudentNumberWellFormed($num);
		//isEmailAddressWellFormed($email);
		}
	}else {
	echo "no such file, sorry";
	        }
	}
else
{

die('must specify filename');

}
?>

PHP:

<?php
//page4.php
function isStudentNumberWellFormed ($studentnumber){

if(!eregi("^a[0-9]{8}$", $studentnumber)){

$openfile = fopen("courses/errors.log", "a+");
$date_time = date("F d, Y (h:i:s a)");
$error = $date_time . $studentnumber;

fwrite($openfile, $error);
fclose($openfile);
$error "Errors have been found in ".$_GET['filename']. ".A report, errors.log has been generated";
return $error;

	}

else{
$numberokay = "Error in string format";
return $numberokay; 
}

}

?>

PHP:

Any help is appreciated
Thanks
- Derek

 

You already have a foreach() loop, which should be file. Just put the validation code inside the loop. Right under the list() statement.