json_encode（）从输出中排除UTF-8编码的字符串

Question

I'm using CakePHP to output an array that contains several UTF-8 encoded strings. I have a layout set up for the output (it's a REST API method):

<?php.
  header("Pragma: no-cache");.
  header("Cache-Control: no-store, no-cache, max-age=0, must-revalidate");.
  header('Content-Type: application/json; charset=UTF-8');.
  header("X-JSON: ".$content_for_layout);.
  echo $content_for_layout;.
?>

This is my view:

<?php echo json_encode($items); ?> 

My database table where I get the data is encoded in utf-8. But when I output the data if one of its elements has special characters like à, á, etc, the string will be set to null in the JSON array. How can I properly output my data?

Answer 1

It looks like your database connection is not set to utf-8, which is the most important part. So add 'encoding' => 'utf8' to the database configuration in your app/config/database.php , for example:

    'default' => array(
        'driver'   => 'mysql',
        'host'     => 'YOURHOST',
        'login'    => 'YOURLOGIN',
        'password' => 'YOURPASS',
        'database' => 'YOURDB',
        'encoding' => 'utf8'
    ),

If you don't set the encoding in the connection, a "default" encoding will be used. The default is likely not utf8.

Answer 2

That most likely means your data is not encoded in UTF-8, most likely because the database connection is not set to UTF-8 and you're actually receiving the data in latin1 on the PHP side. See Handling Unicode Front To Back In A Web App for a rundown of all gotchas.

Answer 3

$items = json_encode( array_map( function($text){ return is_string($text) ? utf8_encode($text) : $text; }, $items) )
echo $items;