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Home > Backend Development > PHP Tutorial > This article mainly shares with you several methods of determining whether a variable is empty in PHP. I hope it can help you. Whether it is empty method

This article mainly shares with you several methods of determining whether a variable is empty in PHP. I hope it can help you. Whether it is empty method

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Release： 2023-03-21 16:00:02

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This article mainly shares with you several PHP methods to determine whether a variable is empty. I hope it can help you.

Use if()

$a=1;if($a)     值为true$a=&#39;a&#39;;
if($a)     值为true$a=&#39;&#39;;
if($a)     值为false$a=0;
if($a)     值为false$a=null;
if($a)     值为false

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empty

$a=1;if(!empty($a))     值为true$a=&#39;a&#39;;
if(!empty($a))     值为true$a=&#39;&#39;;
if(!empty($a))     值为false$a=0;
if(!empty($a))     值为false$a=null;
if(!empty($a))     值为false

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Comparison of several other functions

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