Question

Recently I’ve come across a situation to where using a dynamic variable in a _POST setting is valuable, but it doesn’t seem to work. For example:

for($i = 0; $i<$limit; $i++){
    if (isset($_POST['value_{$i}'])){
    // do something
    }
}

The values from _POST work fine; if I hard code a ‘1’ or a ‘2’ in there, I get my data. It just doesn’t seem to agree with the {$i} inside the _POST. Does anybody know why?

Answer 1

You need to use double quotes to parse variables in strings, eg

for($i = 0; $i<$limit; $i++){
    if (isset($_POST["value_{$i}"])){
    // do something
    }
}

http://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.double