On Thu, 2003-08-14 at 08:45, Ilia Alshanetsky wrote: > Do we really need this function? I see 2 ways of 'implementing' this > functionality in PHP without having to add another function. For example: > (isset($var) || is_null($var)) or gettype($var). > > Ilia
Those ideas don't do the same thing, though. Try it with arrays: -SNIP------------------------------------------------------------ >>>> Array testing with variable_exists() $arr = array(1 => null, 2 => array(1 => 3, 2 => null)); variable_exists($arr[1]): yes (should be yes) variable_exists($arr[2]): yes (should be yes) variable_exists($arr[3]): no (should be no) variable_exists($arr[1][2]): no (should be no) variable_exists($arr[2][1]): yes (should be yes) variable_exists($arr[2][2]): yes (should be yes) variable_exists($arr[2][3]): no (should be no) >>>> Array testing with gettype() $arr = array(1 => null, 2 => array(1 => 3, 2 => null)); gettype($arr[1]): yes (should be yes) gettype($arr[2]): yes (should be yes) Notice: Undefined offset: 3 in /home/torben/public_html/phptest/variable_exists.html on line 40 gettype($arr[3]): yes (should be no) gettype($arr[1][2]): yes (should be no) gettype($arr[2][1]): yes (should be yes) gettype($arr[2][2]): yes (should be yes) Notice: Undefined offset: 3 in /home/torben/public_html/phptest/variable_exists.html on line 44 gettype($arr[2][3]): yes (should be no) >>>> Array testing with (isset() || is_null()) $arr = array(1 => null, 2 => array(1 => 3, 2 => null)); (isset($arr[1]) || is_null($arr[1])): yes (should be yes) (isset($arr[2]) || is_null($arr[2])): yes (should be yes) Notice: Undefined offset: 3 in /home/torben/public_html/phptest/variable_exists.html on line 51 (isset($arr[3]) || is_null($arr[3])): yes (should be no) (isset($arr[1][2]) || is_null($arr[1][2])): yes (should be no) (isset($arr[2][1]) || is_null($arr[2][1])): yes (should be yes) (isset($arr[2][2]) || is_null($arr[2][2])): yes (should be yes) Notice: Undefined offset: 3 in /home/torben/public_html/phptest/variable_exists.html on line 55 (isset($arr[2][3]) || is_null($arr[2][3])): yes (should be no) -SNIP------------------------------------------------------------ -- Torben Wilson <[EMAIL PROTECTED]> +1.604.709.0506 http://www.thebuttlesschaps.com http://www.inflatableeye.com http://www.hybrid17.com http://www.themainonmain.com -----==== Boycott Starbucks! http://www.haidabuckscafe.com ====----- -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
