Does not equal why does position matter

PHP
1

Hi,

so i’ve noticed that sometimes this

if($_GET['order'] !==''){ echo 'do something';}

works and sometimes i have to do it this way

if(!($_GET['order'] =='')){ echo 'do something';}

and move the not operator outside of the equals bit. what is the difference and why does it sometimes work.

thanks

2

I don’t really know, but I think maybe that

if(!($_GET['order'] =='')) {}

is the same as

if($_GET['order'] !='') {}

and that

if($_GET['order'] !=='') {}

is the same as

if(!($_GET['order'] ==='')) {}

So it’s the same difference as between == and ===
Does that make sense?

1 Like
3

a !== b is one operation !(a == b) is two.

4

If the $GET index does not exist an error or warning is raised.

I prefer to use isset(…) && then test the value.

Tediously tapped on a tablet :frowning:

1 Like
5

One is strict equality and the other is two loose equality operations. They by no means do the same thing.

1 Like
6

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