Use of undefined constant I -assumed 'I' in.. In wamp server

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PHP

MySQL

my code below working well in apache server but when in wamp server giving ERROR....
Use of Undefined constant i -assumed 'i' in chstat.php on line 16..

please help me out where I am worng..

What I have tried:

$chnos = 28;
include 'dbcon.php';

$sql = mysql_query("SELECT active FROM channel_des ;") or die("Query to show fields from table failed");

$chstatus = array();

while($row = mysql_fetch_array($sql)){
    array_push($chstatus, $row['active']);
   
}

for($i=0; $i <= $chnos; $i++){
	echo $chstatus[i];
}