Question

i have a while loop, it goes like so….

        while ($fruit_name = current($data)) {
            $string1 .= "'".key($data)."',";
            next($data);
        }

this works perfectly, and echos:

'derp','test'

when the array data =

Array ( [derp] => 68 [test] => 1 )

but, if the array data =

Array ( [derp] => 0 [test] => 0 )

it echos

  nothing,

what do?

Answer 1

If you want to traverse an array manually, you must use each since there is – as you found out – no way to differentiate the negative result from current and a false-valued value. Even if you were to check with === false, you’d still fail if the array contained a false entry.

However, you should really just use foreach instead:

foreach ($data as $k=>$fruit_name) {
    $string1 .= "'". $k . "',";
}