And Operator

and is the logical operator: it returns true only when both operands are true; otherwise, it returns false.

It is synonym with the symbol and operator &&, though it has a different precedence level.

There is also a bitwise and operator: &

and is a PHP keyword.

<?php

$a = 1 && 2;

?>

Related : Logical Operators, Bitwise Operators, Logical Operators, Keyword