if (!'0') what does it do?

[Gayner]

This is my simple code.

 

FIrst of all Hi everyone

 

I am a little lost of some php if function here:

 

if (!$ibforums->member['view_img'])
            {
                echo "OH HELLO!";
            }

 

So My Variable $ibforums->member['view_img'] in my database means = 1

 

So If I replace $ibforums->member['view_img'] to 1 it would be:

 

if (!1)

{

echo "HELLO!";

}

 

I dont get it?

 

What is the ! for ?

 

Thanks in advance.

 

so if it's !0 it means dont show?

[Zyx]

It's one of the logical operators:

 

http://docs.php.net/manual/en/language.operators.logical.php

 

It simply negates the logical value of an expression.

 

PS. "if" is not a function .

[fooDigi]

the "!" in front very simply means NOT...

 

so for if(!1), or any other non-zero number, the if statement will always evaluate to false...

 

with if(!0), it will evaluate to true...

 

so i guess in this sense it kinda just means the opposite, where 0 = false, and any non-zero number true, and the ! just evaluates to the opposite of that...

 

hope this helps... and i wrote that right, lol...

[Gayner]

the "!" in front very simply means NOT...

 

so for if(!1), or any other non-zero number, the if statement will always evaluate to false...

 

with if(!0), it will evaluate to true...

 

so i guess in this sense it kinda just means the opposite, where 0 = false, and any non-zero number true, and the ! just evaluates to the opposite of that...

 

hope this helps... and i wrote that right, lol...

 

What if I put a !2 what would that do?

[fooDigi]

that would be a non-zero number, so it would be the same as 1 or 5 or 23421

[Gayner]

that would be a non-zero number, so it would be the same as 1 or 5 or 23421

So these ! only works with 1 and 0 ? lol

 

but this is a very easy way to do if else statements if they want value 1 or 0 right ? lol

[lynxus]

<?php

I use it for things like , rather than,.


if ($foo == "0") {
       }else{
     do stuff;
    }

i use:

if ($foo != "0") {   // if $foo does not equal 0 do stuff. Rather than if foo equals 0 do nothing else do stuff.
    do stuff;
  }

?>

[Zyx]

if statement requires a boolean value: true or false. 0 and 1 are integers and are automatically converted, as well as all other types you'll try to use here. The manual shows the conversion rules: what is converted to false and what - to true: Boolean type. We can see that "0" is converted to false and any other number - to "true".