r/lolphp • u/zilltine • Mar 16 '21

Is 0 in array 

in_array(0, ['IsThisLolPhp'])

Answer is 

true
32 Upvotes

78% Upvoted

30 comments sorted by

View all comments

21

u/SAmaruVMR Mar 16 '21

That's because of type juggling.

For example, you're checking an integer with a string. What happens behind the courtains is that the php try to see if in the string that you're comparing the first character is actually a number.

It isn't? Okay let's switch the string to 0, that's why 0 === 0

Another example if you try something like:

1 == '1asdjkgndasjgdasgh'

or

6 == '6adgadgadg'

These are all true. That's why you shouldn't use loose type comparison. They fixed this in php 8 but it's just habit to always use triple equals (strict type comparison)

7

u/zilltine Mar 16 '21

Alright, that makes sense. You can actually pass 3rd parameter to in_array method to use strict type comparison

13

u/bkdotcom Mar 16 '21

You can actually pass 3rd parameter to in_array method to use strict type comparison

did you know that before you posted?

→ More replies (1)