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php - !== 和 === 在 PHP 中是什么意思?

转载 作者:可可西里 更新时间:2023-11-01 13:35:05 24 4
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Possible Duplicates:
How do the equality (== double equals) and identity (=== triple equals) comparison operators differ?
Reference - What does this symbol mean in PHP?
php not equal to != and !==

此代码段中的 !===== 运算符是什么?

if ( $a !== null ) // do something
if ( $b === $a ) // do something

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