if语句中的布尔条件

Question

I want to double check something about multiple conditions in a boolean if statement in PHP. Given that I write:

if(!empty($_POST) && !isset($_POST['report_btn'])) {...}

can this be re-written as

if(! ( empty($_POST) && isset($_POST['report_btn']) ) ) {...}

I'm wanting to remove one of the exclamation marks to see if I can make the code a bit tidier. The logic is to see if I can execute the code if POST data has been sent to a page but the 'report_btn' value is not set.

Answer 1

No, You can not write the above condition as below condition:

Reason:

for:

if(! ( empty($_POST) && isset($_POST['report_btn']) ) ) {...}

the result matrix will:

first_statement second_statement result
   true            true          false
   true            false         true
   false           true          true
   false           false         true

And for the below

if(!empty($_POST) && !isset($_POST['report_btn'])) {...}

The result matrix will be:

first_statement second_statement result
   true            true          false
   true            false         false
   false           true          false
   false           false         true

It means both code are not similar.