douyun3887 2017-09-06 12:38
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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 !

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  • duangaixing1509 2017-09-06 12:58
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    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) ...
    
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