how to use AND and OR together in php-CodePudding

Am trying to write a simple PHP function that uses both && and || function in php but am only able to use the && function, i get a desired result as shown with the below code

<?php
$srt = "asc";
if($srt != "" && $srt != "asc"){
    echo "close";
    } else {
    echo "open";
    }
?>

output >> open

But when i add the || function to it i get the wrong result

<?php
$srt = "asc";
if($srt != "" && $srt != "asc" || $srt != "desc"){
    echo "close";
    } else {
    echo "open";
    }
?>

output >> close

I have also try using AND in place of && and OR in place of || since php accepts both but i still get the same result am new to php so i dont know if what am trying is allowed or not so any advise will be greatly appreciated.

CodePudding user response：

Use extra parenthesis to make it an expression.

if ($srt != "" && ($srt != "asc" || $srt != "desc"))

So you compare $srt != "" AND $srt != "asc" || $srt != "desc".

Your code can be improved for readability as

if (!in_array($srt, ['', 'asc', 'desc']))