Need a formatted a output from the following code

I need to get an array output as this [[1, 26], [3, 16], [3, 17], [4, 27], [4, 26]] from the following php mysql code

    include("db.php");

$villa = $_GET['villa'];

$sql = mysql_query("SELECT unavailable_date_from, unavailable_date_to FROM villa WHERE name = '".$villa."'");
$json = "[";
    while($results = mysql_fetch_object($sql)){

        foreach ($results a开发者_Go百科s $field => $value) {
            $a = explode("-", $value);

            $json = $json . '[' . $a[1] .','. $a[2] .'],';
        }

        $json = substr($json, 0, strlen($json)-1);

    }

$json = $json . ']';

echo $json;

The current code give the following result: [[03,08],[03,10][03,15],[03,20]]

Can somebody tell me how can I add that one comma between the second and third array element

Thanks

---

Move $json = substr($json, 0, strlen($json)-1); to be on the line before $json = $json . ']';.

It will look like:

if ($json != '[') $json = substr($json, 0, strlen($json)-1);
$json = $json . ']';

Kind of messy, but it will work. Edit: Using rtrim would be nicer:

$json = rtrim($json, ',');
$json = $json . ']';

Here's the full code:

$json = '';
while($results = mysql_fetch_object($sql)) {
    foreach ($results as $field => $value) {
        $a = explode("-", $value);
        $json .= '[' . $a[1] .','. $a[2] .'],';
    }
}

$json = '[' . rtrim($json,','). ']';

---

for example add this:

$json = str_replace('][', '],[', $json);

before last echo line.

---

The $json = substr($json, 0, strlen($json)-1); should be after the loop finishes and before the ']' addition.

    include("db.php");

$villa = $_GET['villa'];

$sql = mysql_query("SELECT unavailable_date_from, unavailable_date_to FROM villa WHERE name = '".$villa."'");
$json = "[";
    while($results = mysql_fetch_object($sql)){
         foreach ($results as $field => $value) {
            $a = explode("-", $value);
             $json = $json . '[' . $a[1] .','. $a[2] .'],';
        }
     }
if (len($json) > 1) $json = substr($json, 0, strlen($json)-1);
$json = $json . ']';
echo $json;