不能在PHP中使用数组中的字符串值

Question

I have an array with two string values, but cannot use one of them. If I use

var_dump($array[0]);

it's result is

 array(2) { ["id"]=> string(2) "01" ["name"]=> string(10) "Aquamarine" }

but

var_dump($array[0]["id"]);

shows me NULL.

I've tried changing "id" to sth else, tried using ' instead of ", with the same effect, strlen($array[0]["id"]) also returns 0. The second one ("name") works just fine.

Update: The array is initalized with this code:

$handle = @fopen("stones.csv", "r");
if ($handle) {
    while (($row = fgetcsv($handle, 4096, ';')) !== false) {
        if (empty($fields)) {
            $fields = $row;
            continue;
        }
        foreach ($row as $k=>$value) {
            $array[$i][$fields[$k]] = $value;
        }
        $i++;
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail
";
    }
    fclose($handle);
}
var_dump($array[0]);
var_dump($array[0]["id"]);
var_dump(array_keys($array[0]));

So there are no modifications between dumps, last three rows return this

array(2) { ["id"]=> string(2) "01" ["name"]=> string(10) "Aquamarine" } NULL array(2) { [0]=> string(5) "id" [1]=> string(4) "name" }

Now I see that there are some invisible characters in the "id" key, so the next question is how to get rid of them?

Answer 1

trim the key using builtin "trim" function. ref: http://php.net/manual/en/function.trim.php

$handle = @fopen("stones.csv", "r");
if ($handle) {
    while (($row = fgetcsv($handle, 4096, ';')) !== false) {
        if (empty($fields)) {
            $fields = $row;
            continue;
        }
        foreach ($row as $k=>$value) {
            $array[$i][trim($fields[$k])] = $value;
        }
        $i++;
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail
";
    }
    fclose($handle);
}
var_dump($array[0]);
var_dump($array[0]["id"]);
var_dump(array_keys($array[0]));