NULL stands for a variable without value. To check if a variable is NULL you can either use is_null($var) or the comparison ( === ) with NULL. ... <看更多>

前言. 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 ... ... <看更多>

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Is there a version of PHP, or perhaps a setting within PHP whereby echo $data['example']; would simply return null or 0 in the case of a non-existent key? ... <看更多>