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php 0 "" null empty的最大区别

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Release: 2016-06-06 20:39:02
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php 0 "" null empty的最大区别

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php 0 "" null empty的最大区别

參見:http://stackoverflow.com/questions/137487/null-vs-false-vs-0-in-php

主要區別一是類型,二是在進行比較時,上面答案中都有,我就不複製了。

而 empty,應該是 empty() 吧

除了前面列出的,還包括 0.0、"0"、empty array、variable without value

php 的 == 被很多人吐槽,所以建議樓主用 ===,這樣就不會困惑 0 "" null 等值的區別了。

0,'', null empty()都是 true
0,'' isset()是true,null isset()是false

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