Comparison of several functions for determining whether PHP is null _ PHP Tutorial-php Tutorial

Comparison of several functions for PHP to determine whether it is null. Comparison of several functions for determining whether PHP is empty this article mainly introduces the comparison of several functions for determining whether PHP is empty. This article describes gettype (), empty (), is_null () comparison of several functions such as isset () and PHP that determine whether it is null

This article mainly introduces the comparison of several functions for PHP to determine whether it is null. This article describes gettype (), empty (), is_null (), isset () when several functions return values in different variables, you can refer

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This article mainly introduces the comparison of several functions in PHP to determine whether it is null. This article describes several functions such as gettype (), empty (), is_null (), and isset...