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Bug #43043 NULL == '' for ntext and nvarchar(max)
Submitted: 2007-10-19 18:51 UTC Modified: 2007-10-21 15:30 UTC
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: alan dot trick at twu dot ca Assigned:
Status: Not a bug Package: MSSQL related
PHP Version: 5.2.4 OS: Linux
Private report: No CVE-ID: None
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From: alan dot trick at twu dot ca
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 [2007-10-19 18:51 UTC] alan dot trick at twu dot ca
This bug is somewhat related to #39213 except it only occurs (as far as I can tell) on fields that are ntext and nvarchar(max). The Moodle bug report MDL-11810 ( has more info. This is with freeTDS.

Reproduce code:
$tables = array(
    'nulltest' => 'varchar(5)',
    'nulltestnvar' => 'nvarchar(5)',
    'nulltestntext' => 'ntext',
    'nulltestnvarmax' => 'nvarchar(max)'
foreach($tables as $table=>$domain) {
    print "==$table==\n";
    mssql_query("create table $table (test $domain);");
    mssql_query("insert into $table values('');");
    $r = mssql_query("select * from $table;");
    while ($a = mssql_fetch_assoc($r)) var_dump($a['test']);
    mssql_query("drop table $table;");

Expected result:
string(0) ""
string(0) ""
string(0) ""
string(0) ""

Actual result:
string(0) ""
string(0) ""


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 [2007-10-19 21:47 UTC] felipensp at gmail dot com
This isn't a bug.
Check the configuration options mssql.textlimit and mssql.textsize.
 [2007-10-19 21:59 UTC] alan dot trick at twu dot ca
Why would that have anything do do with anything? Aren't those just limits on the maximum amount of text that can come through?

My values in php.ini are:

mssql.textlimit = 20971520
mssql.textsize = 20971520

I had to set it because mssql was cropping some of my long text fields.
 [2007-10-21 15:30 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

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