注意：未定义的偏移量：0 - 我的数组包含值

I have a little problem, I don't understand.

I have this code :

public function formAlreadySent($demande){
        $data = odbc_exec($this->dbConnection,"SELECT COUNT(*) FROM [@JDC_QSTR] WHERE U_Demande = ".$demande);
        $nombre = odbc_fetch_array($data);
        print_r($nombre);
        if($nombre[0] > 0)
            return true;
        else
            return false;
    }

The result of my print_r is :

Array ( [0] => 0 )

But I got this error :

Notice: Undefined offset: 0 in C:\wamp\www\enquetesatisfaction\libs\model\QuestionsManager.class.php on line 89

Line 89 is :

if($nombre[0] > 0)

If someone know why this problem happen ?

Thanks in advance !

According to the PHP documentation, odbc_fetch_array fetches a result row and returns it as an associative array, or returns false if there are no more rows.

Being an associative array, the index of the first item (COUNT(*)) should not be [0]. To be honest, I don't know why it apparently is.

I would suggest this: first alias the count in your SQL, like

SELECT COUNT(*) AS rowcount ...

Then reference that alias after you fetch the result.

if($nombre['rowcount'] > 0) ...

as per the var_dump output:

array (size=1) '0' => string '0' (length=1)

The reason for error

Notice: Undefined offset: 0 in

is that it is a string and you are accessing as an integer

It can be stooped using if with key but I would suggest to check using PHP funciton array_key_exists