PHP Array Index using variable

Question

I'm having a trouble getting my array content when using a declared variable as my array indexes shown below.

$indexes = "[0][1][0][1]";
$code = $params["smv_code"].$indexes;

this returns an "Array to string conversion error";

Note that the $indexes is dynamic depends on the "parent_0_1_0_1" params content of the array index.

Answer 1

the . operator just does a string concatenation - it's not going to work for code like that. I don't think PHP has the ability to interpret raw code like that - at least not safely. (You can always use eval, but there are serious security concerns for using something like that - injection, etc.).

I would suggest just traversing the array "manually" through interpreting the indexes yourself. Change the $indexes to "0,1,0,1" and do the following:

$index_array = explode(',',$indexes)
$code = $params["smv_code"];
foreach($index_array as $i) {
  $code=$code[$i];
}

$code at the end should be the value you're looking for.