RE: [PHP] variable functions: empty/isset/unset invalid?

Though I didn't know about 'variable functions' when answered, this is exactly what I said.. Interesting :) >>$foo is a string not a PHP function which makes 'empty' a string and not a >>function/command. >> >>Am I missing something? >> >>oktay -----Original Message----- From: Philip Olson [mailto:philip@cornado.com] Sent: Monday, May 07, 2001 2:43 PM To: php-general@lists.php.net Subject: RE: [PHP] variable functions: empty/isset/unset invalid? Solved. empty, isset and unset are not functions, they are language contructs, which results in the error. This makes sense, a workaround is creating functions like isEmpty (or something similar) and using them. I'll be submitting a future request soon ;) Thanks everyone, especially OpenSrc in #php regards, Philip <snip> > > <?php > > > > // works > > if (empty($var)) print '$var is empty<br>'; > > > > // works > > $foo = 'is_string'; > > $var = 'abcdef'; > > if ($foo($var)) print '$var is a string<br>'; > > > > // works > > $foo = 'strlen'; > > $var = 'abcdef'; > > if ($foo($var) > 5) print '$var is over 5 chars<br>'; > > > > // doesn't work : Fatal Error : Call to undefined function: empty() > > // same with isset() and unset() > > $foo = 'empty'; > > if ($foo($var)) print '$var is empty'; > > > > ?> > > > > In otherwords, only these few functions aren't working as "variable > > functions" but result in a "Fatal Error" instead. Why? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net For additional commands, e-mail: php-general-help@lists.php.net To contact the list administrators, e-mail: php-list-admin@lists.php.net