How to make a crontrolpanel for apache sites with cronjobs, a2ensite, a2dissite and force-reload

Hi.

I have created a php script that integrates with a mysql database with all my sites in it.
The script works perfectly when i run it in console on account with access to apache with the php script.php command.
But when i add it to crontab to run every 5 minute i get an e-mail saying "command not found: a2ensite". same thing with a2dissite.

Is there anything i am doing wrong in my script?
Or do i have to learn myself cgi?

The command beeing run is in the codefield.

<?php
/**************************************\
|** Denne filen skal kjøre i crontab **|
\**************************************/
$date = date("Y-m-d H:i:s");
 
// Lage funksjoner for å forenkle kroppen på filen
function mysqlconnect(){ // Koble til MySQL
	include("config.inc.php");
	@mysql_connect($server,$username,$password) or die("DB: Access Denied");
	@mysql_select_db($database) or die("Unable to select database");
}
function mysqlrun($var){
	$result = mysql_query($var);
	return $result;
}
/* UTFÃÜR ENDRINGER */
mysqlconnect();
$db = mysqlrun("SELECT id, sitename, enabled FROM `a2_sites` WHERE cronthis = '1'");
$execforce = 0;
	while($sql = mysql_fetch_array($db)) {
	$execforce = 1;
	$sitename  = ""; //Tømme stringen
	$sitename  = $sql['sitename'];
		if($sql['enabled'] == 1) {
			mysqlrun("UPDATE `a2_sites` SET `cronthis` = '0' WHERE `id` =$sql[id] LIMIT 1;");
			exec("a2ensite $sitename");
			//echo "a2ensite $sitename\r\n";
		} else {
			mysqlrun("UPDATE `a2_sites` SET `cronthis` = '0' WHERE `id` =$sql[id] LIMIT 1;");
			exec("a2dissite $sitename");
			//echo "Croned disabled thingy<br>";
			//echo "a2dissite $sitename\r\n";
		}
	}
	if($execforce == 1) exec("/etc/init.d/apache2 force-reload");
mysql_close();
 
/* SJEKK SYSTEMET */
// Sjekke sitene som eksisterer
array(exec("ls /etc/apache2/sites-available/", $sitesavailable)); // Sider som er tilgjengelige
array(exec("ls /etc/apache2/sites-enabled/", $sitesenabled)); // Sider som er aktiverte
$num_sitesavailable = count($sitesavailable);
$num_sitesenabled = count($sitesenabled);
 
$i = 0;
while($i < $num_sitesavailable){
 
	// Sjekke om siden er aktivert
	$enabled = 0; //Resette enabled status til Ikke Aktivert
	$in = 0;
	while($in < $num_sitesenabled){
		if(!$enabled){
		if($sitesenabled[$in] == "000-default") $sitesenabled[$in] = "default"; // Fiks for lokal standard fil
			if($sitesenabled[$in] == $sitesavailable[$i])
				$enabled = 1;
		}
		$in++;
	}
 
	$sitename = $sitesavailable[$i];
 
		mysqlconnect();
		$db = mysqlrun("SELECT sitename FROM `a2_sites` WHERE sitename = '$sitename'");
		$num = mysql_num_rows($db);
			if($num == 0){ 
				$isthere = 0;
			} else { $isthere = 1; }
		if($isthere == 0){ // insert
			mysqlrun("INSERT INTO `a2_sites` ( `id` , `sitename` , `lastupdate` , `cronthis` , `enabled` , `health` ) VALUES (NULL , '$sitename', '$date', '0', '0', '0');");
			//echo "Finnes ikke i SQL, inserting: $sitename\r\n";
		} else { // update
			//echo "UPDATE `a2_sites` SET `lastupdate` = '$date', `enabled` = '$enabled', `health` = '1',  WHERE `sitename` = '$sitename' LIMIT 1;\r\n";
			mysqlrun("UPDATE `a2_sites` SET `lastupdate` = '$date', `enabled` = '$enabled', `health` = '1'  WHERE `sitename` = '$sitename' LIMIT 1;");
		}
		mysql_close();
 
	$i++;
}
 
// Check site health
mysqlconnect();
$db = mysqlrun("SELECT id, sitename FROM `a2_sites` WHERE health = '1'");
while($sql = mysql_fetch_array($db)) {
	$id			= $sql['id'];
	$sitename	= $sql['sitename'];
	$isthere = file_exists("/etc/apache2/sites-available/$sitename");
	if($isthere == 0) mysqlrun("UPDATE `a2_sites` SET `health` = '0', `enabled` = '0' WHERE `id` = '$id' LIMIT 1;");
	//echo "Isthere = $isthere | UPDATE `a2_sites` SET `health` = '0', `enabled` = '0' WHERE `id` = '$id' LIMIT 1;\r\n";
 
}
mysql_close();
 
?>

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