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php json_encode returns blank for array

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I am trying to return the result of a mysql query as json, but the json_encode function always returns a blank although the array contains elements.

Here is the relevant code

Retrieve the query and convert to php array:

$sql = "blablabla"; $clients = mysql_query($sql, $con);  $result = array(); while($row = mysql_fetch_assoc($clients)) {     //echo "rij: " . $row['name'];     $result[] = $row; } 

Then I return the result:

echo json_encode($result); 

This returns nothing, while I do get results when echoing the following statements:

echo count($return); 

returns 1

echo $return[0]; 

returns "Array"

echo $return[0]['name']; 

returns "Robert"

Any idea what I am doing wrong?

Tags:php, mysql, arrays, json

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