開個玩笑大家別當真啊，PHP 真香。 之所以會有這篇比較基礎的文章，是因為去年在面試時，曾經被問到isset、empty、is_null 三者的差別，但當時因為太 ... ... <看更多>

This video explains the commonly used empty method in PHP, which will check whether the value that has been passed through is empty or not. ... <看更多>

If the echo is displaying null then it is not null. It is a string "null" which are two entirely different things. This, in fact is a common problem when ... ... <看更多>

PHP isset() and empty() black magic. Raw. isset_and_empty.md. When dealing with arrays in PHP, checking for an index like if ($a['foo']) throws a PHP ... ... <看更多>

If you don't have a sensible value to initialize your variable with, then you should not be creating that variable at that point in your ... ... <看更多>