how to use variable php as array index within pg_Query

Question

Hi I got a problem to insert form data using PHP into database. I got too many data that has to be input into database. so i use pg_query inside for loop. But the error shown up

"syntax error, unexpected '(', expecting identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING) in C:\xampp\htdocs\SchedulingApplication\Code\dosavecapacity.php on line 56"

Here's my code

for ($i = 0; $i < 32; $i++) 
 {   
    $eva = pg_query("INSERT INTO FC VALUES('$input','$tipe','$chan','$blnthn','$days[($i)]','$time[1]','$tipe31[($i+1100)]');");    
 }

is there any wrong syntax that i've made? How am i supposed to do for using php variable as an array index?

Thankyou in advanced. :D