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POjson_encode for mysql query returns some null columns of some rows, but the columns aren't null
 

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  1. POjson_encode for mysql query returns some null columns of some rows, but the columns aren't null
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    <p>I'm creating a little php file to get mysql rows for my android application. to retrieve each single row i use:</p> <pre><code> $q=mysql_query($sql, $this-&gt;conn) or die (mysql_error()); while($e=mysql_fetch_assoc($q)) { $output[]=$e; } print(json_encode($output)); </code></pre> <p>but sometimes it returns me an inconsistent output.</p> <p>Here's an example: The row:</p> <p>id=1 (correct) - name="name1" (correct) - price=200 (correct) - price2=null (correct) - <strong>area=null (NOT CORRECT)</strong> because area has a value of "Centro Città" .. and so on..</p> <p>How can i resolve this problem?</p> <p>EDIT: the value is</p> <p>[{"id":"84","idutente1":null,"idutente2":null,"idutente3":null,"idutente4":null,"idutente5":null,"idagente":null,"annuncio":"0","archiviato":"0","dataarchiviazione":"2012-07-05 13:31:19","tipoimmobile":"Residenziale","metodo":"Vendita","area":null,"presentazione":"1","homepage":"1","mappa":"1","nome":"Piazza Umberto I","luogo":"Crotone","descrizione":"60 mq composto da due vani oltre servizi, centralissimo buono per ufficio.","descdettagliata":" L'appartamento è diviso in due vani con cucina e bagno.&lt;/p>\r\nPosto nel pieno centro e vicinissimo al lungomare Regina Margherita.&lt;/p>\r\n Ottimo condominio. Libero e disponibile da subito. /p>","vani":"2","prezzo":"87000","prezzo1":"0","prezzo2":"0","prezzo3":"0","prezzo4":"0","prezzo5":"0","metriquadri":"58","stato":"In buono stato","riscaldamento":"Autonomo","classeenergetica":"Non dotato","piano":"Primo/secondo/terzo","indicazioni":"","mutuo":"No","banca":"","importo":"","finalita":"","tipologia":"","ammortamento":"","visite":"20","timestamp":"2012-06-25 10:48:01","nomefile":"HPIM2268.jpg"}]</p> <p>area field is not null, but is "Centro Città". The rest is correct. I tried to show only the "area" field with a mysql_fetch_assoc($query) and it returns me the correct result: "Centro Città". This problem is only with json_encode.</p> <p>The SQL Variabile is:</p> <pre><code>$sql = sprintf("SELECT i.*, f.nomefile FROM immobili i LEFT JOIN foto f on(i.id=f.idimmobile AND f.copertina=1) WHERE i.id=%s", $_GET['id']); </code></pre> <p>This is only an example, if i ask other rows, the area field returns correctly also with json_encode and other fields return null. Could it be a problem related with the strings and the text format?</p>
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    1. COAs stated in the PHP manual for the [`mysql_query()`](http://php.net/manual/en/function.mysql-query.php) function: *Use of this extension is discouraged. Instead, the [MySQLi](http://www.php.net/manual/en/book.mysqli.php) or [PDO_MySQL](http://www.php.net/manual/en/ref.pdo-mysql.php) extension should be used. See also [MySQL: choosing an API](http://www.php.net/manual/en/mysqlinfo.api.choosing.php) guide and [related FAQ](http://www.php.net/manual/en/faq.databases.php#faq.databases.mysql.deprecated) for more information.*
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    2. COPlease show the value of your `$sql` variable.
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    3. COvalue added thank you
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