#28711 [Opn]: $QUERY_STRING is define with null instead of stay undefine when no query string

ID: 28711 User updated by: sikachu at beezone dot net Reported By: sikachu at beezone dot net Status: Open Bug Type: Unknown/Other Function Operating System: Windows 2000 PHP Version: 5.0.0RC3 New Comment: Well ... I used isset() with $QUERY_STRING to check the query all the time. Also, my server still PHP 4.3.7 and it's at http://ragnarok.beezone.net . On there, If you type in 'http://ragnarok.beezone.net', it will load itself because the isset($QUERY_STRING) is false! And if I type something like 'http://ragnarok.beezone.net/?board' That will trigger the code and redirect to the page we provide ! Can somebody test and confirm that just because my server use cgi (php.exe) instead of isapi module (php5isapi.dll)? Thanks anyway, imprestavel. I think if I change the script whole site to use empty(), it may works. But I sill confuse with this behavior. Previous Comments: ------------------------------------------------------------------------ [2004-06-10 09:18:43] imprestavel at gameguru dot com dot br I think php4 does that too (just tested, but register_globals is off) Maybe you are confusing isset with empty "isset -- Determine whether a variable is set ... Returns TRUE if var exists; FALSE otherwise." "empty -- Determine whether a variable is empty ... empty() returns FALSE if var has a non-empty and non-zero value. In otherwords, "", 0, "0", NULL, FALSE, array(), var $var;, and objects with empty properties, are all considered empty. TRUE is returned if var is empty." You may find that information here: http://www.php.net/isset http://www.php.net/empty Hope it helps ------------------------------------------------------------------------ [2004-06-09 16:46:18] sikachu at beezone dot net Clearify the bug summary ... ------------------------------------------------------------------------ [2004-06-09 16:44:18] sikachu at beezone dot net Change the version number in topic from RC2 to RC3 ... ------------------------------------------------------------------------ [2004-06-09 16:42:41] sikachu at beezone dot net Description: ------------ I upgraded from PHP 4.3.4 to PHP 5.0 RC3 yesterday. When I tried to run the script that check for the query string and then refresh to the page, the query string return the invalid value. This behavior I found only in PHP 5.0 RC3 I'll show you the result with these thing: echo $QUERY_STRING; isset($QUERY_STRING); $QUERY_STRING == ""; For example, assume that the script URL is http://somewhere.com/index.php If I call it like this: http://somewhere.com/index.php?foo echo $QUERY_STRING; // show foo isset($QUERY_STRING); // return true $QUERY_STRING == ""; // return false But, here is the problem. If I call it like this: http://somewhere.com/index.php echo $QUERY_STRING; // show ""(nothing) isset($QUERY_STRING); // return true << unexpected $QUERY_STRING == ""; // return true The code that I use for test will be in the next section. My PHP configuration based on php.ini-dist. I changed register_global to be On, and then add php_mysql & php_mysqli extension to it. Reproduce code: --------------- if(isset($QUERY_STRING)) { echo "Your query string is defined\n"; } if($QUERY_STRING == "") { echo "Your query string is null\n"; } if($QUERY_STRING == " ") { echo "Your query string contain just a space\n"; } echo "Here is your query string: '".$QUERY_STRING."'"; Expected result: ---------------- Your query string is null Here is your query string: '' Actual result: -------------- Your query string is defined Your query string is null Here is your query string: '' ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=28711&edit=1