Is null equal to ''

Question

I using this code

$dato = array_shift($datos);
while($dato!=''){...}

Is it correct?

Is the same to put:

while($dato!=''){...}

Than

while($dato!=null){...}

Edit: This is on the oficial documentation php

Returns the shifted value, or NULL if array is empty or is not an array.

But my code is actually running

Did you try it? What is null and what is empty when you read the manual? — Andreas, Dec 02 '18 at 13:14
Possible duplicate of [What is the difference between null and empty?](https://stackoverflow.com/questions/5615747/what-is-the-difference-between-null-and-empty) — A l w a y s S u n n y, Dec 02 '18 at 13:15
https://stackoverflow.com/questions/41887897/how-do-i-validate-null-or-empty-in-php — jvk, Dec 02 '18 at 13:15
@Andreas yes i've tried, i'm studing engineering and my teacher said that my code was not ok. But is actually runnig. By the way also he told me there are no booleans on php??? That is not true lol — KaSkuLL, Dec 02 '18 at 13:16
Null = no value, '' = empty string. Also you can try it $var = ''; if($var == null){ echo 'var is null'; } else { echo 'var is not null';} — bakero98, Dec 02 '18 at 13:16

score 0 · Answer 1 · answered Dec 02 '18 at 13:18

0

I think you are trying to check the value is empty in any array

while(!empty($dato)){...}

answered Dec 02 '18 at 13:18

jvk

score 0 · Answer 2 · answered Dec 02 '18 at 13:18

0

NULL = Doesn't exist
'' = Exists but it's empty

answered Dec 02 '18 at 13:18

Universe

score 0 · Answer 3 · answered Dec 02 '18 at 13:19

You can validate in many ways :

3 Answers3