note 47409 added to language.types.boolean

another correction to the preceding "correction": "as the documention states" is right, "any non-empty string is true" is wrong : (bool) "0" === false ! (but "00" and "0.0" etc. are true!) So watch out, you can NOT test for non-empty strings using e.g. <?php if (is_string($s)) if ($s) echo " '$s' is a non-empty string"; else echo " '$s' is an empty string"; // wrong for $s='0' ! else echo " $s is not a string "; ?> indeed, for $s='0' this would print: " '0' is an empty string" which is wrong, of course. This is particularly "dangerous" in connection with MySQL which prints FALSE by default as 0, which comes back from a FORM POST as string '0', while PHP prints FALSE as empty string (!); a similar problem is to preserve a NULL value through a FORM post.... ---- Manual Page -- http://www.php.net/manual/en/language.types.boolean.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+47409 Delete -- http://master.php.net/manage/user-notes.php?action=delete+47409&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+47409&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+47409&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+47409&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+47409&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+47409&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+47409&report=yes Search -- http://master.php.net/manage/user-notes.php