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Comparison of several functions in PHP to determine whether it is empty_PHP tutorial

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Release： 2016-07-13 09:56:32
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Comparison of several functions in PHP to determine whether it is empty

This article mainly introduces the comparison of several functions in PHP to determine whether it is empty. This article explains gettype(), empty (), is_null(), isset() and other functions return values ​​​​under different variables. Friends in need can refer to it

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www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/987721.htmlTechArticleComparison of several functions in PHP to determine whether it is empty. This article mainly introduces several functions in PHP to determine whether it is empty. Function comparison, this article explains several functions such as gettype(), empty(), is_null(), isset()...
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