更改变量名称（编号）或以asc顺序将变量添加到变量以分配值

How to change the variable name numbering in ascending order to assign values to them. eg: car_1, car_2, car_3, car_4........ so on.. my coding is something like;

for (i=1; i<20;i++){
$var[i] = $_POST["car_"i];
}

foreach ......so on........

echo $var[12]."<br/>";

I need a way to increase the number of 'car_' to assign each car value to the '$var' array. I have tried to add it like this:

$var[i] = $_POST["car_"&i];

AND

$var[i] = $_POST["car_"i""];

and none of these work. I would very much appreciate your help to solve this.

If you mean to append strings then do this:

for ($i=1; $i<20;$i++) {
   $var[$i] = $_POST["car_".$i];
}