for what this ~ use ?

[Yemen Coder]

hi everyone

l see this code in user script and i don't know why he use this ~ symbol

the code is

if( ~$user->premission & USER::create_Forum){
...................
}

is this symbol for negative or what

i still wait any idea about it

[karthik_ppts]

Bits that are set in '$user->premission' are not set, and vice versa.
Refer this link http://www.php.net/manual/en/language.operators.bitwise.php

[IIM]

~ $a- means(Not) Bits that are set in $a are not set, and vice versa.

[Yemen Coder]

thanks a lot guys for help me

[ko ko]

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