php 为空时为空? [英] php is null when empty?

查看：36 发布时间：2022/1/6 22:27:15 php null

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I have a question regarding NULL in PHP:

  $a = '';
  if($a == NULL) {
      echo 'is null';
  }

Why do I see is null when $a is an empty string? Is that a bug?

解决方案

What you're looking for is:

if($variable === NULL) {...}

Note the ===.
When use ==, as you did, PHP treats NULL, false, 0, the empty string, and empty arrays as equal.

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