Often, we’ll encounter situations where we have more than one condition we need satisfied in order to take an action.

The logical && operator returns TRUE only if both of its operands evaluate to TRUE. It returns FALSE if either or both of its operands evaluate to false.

TRUE && TRUE;    // Evaluates to: TRUE
FALSE && TRUE;   // Evaluates to: FALSE
TRUE && FALSE;   // Evaluates to: FALSE
FALSE && FALSE;  // Evaluates to: FALSE

Let’s think about a real-world example: when attempting to withdraw money from an ATM, the account holder must both provide the correct PIN and have enough money in their account.

$correct_pin = TRUE;
$sufficient_funds = TRUE;
if ($correct_pin && $sufficient_funds){
  echo "You can make the withdrawal.";
}

The && operator has a higher operator precedence than the || operator. This means that in a complex statement that includes both operators, the computer will evaluate the part of the expression with && first:

TRUE || TRUE && FALSE // Evaluates to: TRUE

If we want to control the order in which the expression is evaluated, we can use parentheses for force the order:

(TRUE || TRUE) && FALSE // Evaluates to: FALSE

Let’s get some practice with the && operator!