checking keys in array

[aconway]

I have two problems.

1. I want to input an id and name from a form and check if both items exist as keys within an array. So far all I get is my warning echoed back.

2. My warning gets echoed back four times, I don't know why.

here is my code:

<?php
//value specifies which text file to open
$class = $HTTP_POST_VARS['class'];

//name of student
$name = $HTTP_POST_VARS['name'];

//student's id
$id = $HTTP_POST_VARS['id'];

//open file into an array by lines
$file = file ("$class");

//file into array by lines
foreach( $file as $line ) {

//split by tabs
$data = explode("\t", $line);

//the [1] will be your id
if ( $id == $data[1] && array_key_exists($name, $data[0]) ) {
print "<table>\n
		<tr><th>Name</th>
		  <th>ID Number</th>
		  <th>Your Points</th>
		  <th>Possible Points</th>
		  <th>Percentage</th>
		  <th>Grade</th>
		</tr>\n
		<tr><td>{$data[0]}</td>
		  <td align='center'>{$data[1]}</td>
		  <td align='center'>{$data[2]}</td>
		  <td align='center'>{$data[3]}</td>
		  <td align='center'>{$data[4]}</td>
		  <td align='center'>{$data[5]}</td>
		</tr>\n
	  </table>";
} else { print "Wrong"; }
}
?>

[ramas]

instead of using directly the variables
like $data[0] in the table row put echo $data[0]

[ramas]

instead of using directly the variables
like $data[0] in the table row put echo $data[0]