#49588 [NEW]: Json_encode returns null for certain strings

From:             fernando at consultorpc dot com
Operating system: Linux/Mac OSX Leopard
PHP version:      5.3.0
PHP Bug Type:     JSON related
Bug description:  Json_encode returns null for certain strings

Description:
------------
At my specific case, if a string contains an Euro symbol ( € ),
json_encode will return null for that string.

It might also happens with other special characters.

Reproduce code:
---------------
<?php

$array = array(
        'name' => htmlentities( 'My euro symbol €.' )
);

var_dump( $array );
var_dump( json_encode( $array ) );

Expected result:
----------------
array(1) {
  ["name"]=>
  string(29) "My euro symbol &euro;."
}
string(13) "{"name":"My euro symbol &euro;."}"

Actual result:
--------------
array(1) {
  ["name"]=>
  string(29) "My euro symbol &acirc;?&not;."
}
string(13) "{"name":null}"

-- 
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