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undefined variable

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Having issues with an in book problem. I keep getting and "Undefined variable" Notice on the line that starts with "while ($currField != NULL) {" I am assuming it has something to do with the not NULL but I have no clue on this one folks.

ini_set('display_errors', 'on');

$record = "jdoe:8W4dS03a39Yk2:1463:24:John Doe:/home/jdoe:/bin/bash";
$passwordFields = array(
	"login name",
	"optional encrypted password",
	"numerical user ID",
	"numerical group ID",
	"user name or comment field",
	"user home directory",
	"optional user command interpreter");

$fieldIndex = 0;
$extraFields = strtok($record, ":");
while ($currField != NULL) {
	if ($fieldIndex < count($passwordFields))
		echo "<p>The {$passwordFields[$fieldIndex]} is <em>$currField</em></p>\n";
	else {
		echo "<p>Extra Field # $extraFields is <em>$currField</em></p>\n";
	$currField = strtok(":");
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