Adding boolean logic

[Lapinskas]

Logical operators like |, & and ! could be used if values are boolean.

Example:

$evaluator->variables = [ 'a' => true, 'b' => false ]; echo $evaluator->execute('a & !b');

[Lapinskas]

Hello @madorin ,

I hope you will find this feature interesting!

[madorin]

@Lapinskas , did a very quick look over the code, overall it seems nice and fit well into current design.
I'll check/test it a bit more in a few days and if all fine, will merge it into mainstream.
Thanks for your involvement and time!

Think for full support we still need a kind of >, <, <=, >= operators also, to have expressions like "(2 > a) & b".
Saw spreadsheet engines supports it.
Currently this feature is not a top one for me, as we use it mainly for numbers, financial calculations, but indeed, could be very usefull for others ;)

[Lapinskas]

You're right, @madorin , that feature could be useful.
I have just implemented direct needs of my project, but will think about adding support of other boolean operands as well.