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Bug #70384 mysqli_real_query(): Unknown type 245 sent by the server
Submitted: 2015-08-28 18:13 UTC Modified: 2015-12-10 09:49 UTC
Avg. Score:4.8 ± 0.4
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:0 (0.0%)
From: marc at infomarc dot info Assigned: mysql (profile)
Status: Closed Package: MySQLi related
PHP Version: 7.0.0RC1 OS: Linux
Private report: No CVE-ID: None
 [2015-08-28 18:13 UTC] marc at infomarc dot info
I report this for 7.0.0RC1 but am able to reproduce also on PHP 5.6.7. MySQL Server is 5.7.8-rc. Test table created with 

CREATE TABLE `marctable` (
 `jsoncol` json DEFAULT NULL,

Test script:

$link = mysqli_init();

$connect_result = mysqli_real_connect($link, '', 'userxxx', 'passxxx', 'marcdb');

echo "connect_result: " . $connect_result . "\n";

$query_result = mysqli_real_query($link, "select * from marctable");

echo "query result: " . $query_result . "\n";

echo "mysqli_error: " . mysqli_error($link) . "\n";

Expected result:
connect_result: 1
query result: 1

Actual result:
connect_result: 1
PHP Warning:  mysqli_real_query(): Unknown type 245 sent by the server. Please send a report to the developers in bugjson.php on line 9

Warning: mysqli_real_query(): Unknown type 245 sent by the server. Please send a report to the developers in bugjson.php on line 9
zend_mm_heap corrupted


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 [2015-08-28 19:22 UTC] morgan dot tocker at oracle dot com
There is a temporary workaround available here.  The test case can be modified to cast the JSON type to a CHAR, which is fine from PHP's perspective:

select id, CAST(jsoncol as CHAR)  from marctable
 [2015-08-28 19:43 UTC]
-Status: Open +Status: Assigned -Assigned To: +Assigned To: mysql
 [2015-09-29 14:02 UTC]
-Status: Assigned +Status: Closed
 [2015-09-29 14:02 UTC]
The fix for this bug has been committed.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at

 For Windows:
Thank you for the report, and for helping us make PHP better.

Fixed in PHP-5.6, PHP-7.0 and master (PHP-7.1)

Thank You for your report
 [2015-09-29 21:30 UTC] marc at infomarc dot info
Hi Andrey,
I believe you also need to register MYSQLI_TYPE_JSON in ext/mysqli/mysqli.c.

Marc Delisle
 [2015-09-30 07:06 UTC]
Hi Marc,
I forgot that. A fix got just pushed to 5.6, 7.0 and 7.1

 [2015-10-05 14:24 UTC] lucian dot depold at gmail dot com
Problem does not seem to be resolved in 5.6.14 for windows. Newer snapshots are somehow not available.
 [2015-12-09 01:47 UTC] jterry at joeterry dot com
It looks like the issue is resolved when using the approach given by the OP, however, it's still reproducible in 5.6.16 with the following:

$query = mysqli_query($db, $sql); // table contains a JSON field

if (false !== $query) {
    while ($row = mysqli_fetch_array($query) {
        // do something
 [2015-12-10 09:49 UTC]
can you provide a minimal test case that fails, together with information about PHP version (I suppose 5.6.16), whether libmysql or mysqlnd is used by mysqli (phpinfo() will tell this).

 [2015-12-10 16:00 UTC] jterry at joeterry dot com
Hi Andrey - happy to:

Apache/2.4.6 (CentOS) OpenSSL/1.0.1e-fips PHP/5.6.14
mysqlnd 5.0.11-dev

For the test case, see my previous comment; when that code snippet is executed I see the 245 error. The only note I'd add is that the SQL has a valid JSON column data type in the return, and that your suggestion of CAST(jsoncol AS CHAR) does work around the issue.
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