PHP Interview Questions and answers» variables archives – interview questions and answers http://www.phpinterviewquestions.com Prepare for your next php based interview with high confidence Mon, 26 Sep 2011 08:37:10 +0000 http://wordpress.org/?v=2.9.2 en hourly 1 Variable variables http://www.phpinterviewquestions.com/php-interview-questions/regular-level-php-interview-questions/variable-variables/ http://www.phpinterviewquestions.com/php-interview-questions/regular-level-php-interview-questions/variable-variables/#comments Tue, 23 Feb 2010 05:19:03 +0000 Bart http://www.phpinterviewquestions.com/wordpress/?p=21 What is the difference between $message and $$message?

$message is a variable and it’s name is “$message”. But $$message is a variable of a variable, in which it is referred by the value of the $message variable itself.

]]> http://www.phpinterviewquestions.com/php-interview-questions/regular-level-php-interview-questions/variable-variables/feed/ 0 Determine variable existence http://www.phpinterviewquestions.com/php-interview-questions/regular-level-php-interview-questions/determine-variable-existence/ http://www.phpinterviewquestions.com/php-interview-questions/regular-level-php-interview-questions/determine-variable-existence/#comments Tue, 23 Feb 2010 05:19:03 +0000 Bart http://www.phpinterviewquestions.com/wordpress/?p=6 What is the best way to determine if a variable is exiting or not?

isset($x) can be used. But if it’s defined like this
$x=NULL
The answer will be false even if the variable is completely valid.

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