How can the use of logical operators like "AND" in PHP scripts lead to unexpected errors and how can they be avoided?

Using logical operators like "AND" in PHP scripts can lead to unexpected errors if the operands are not properly grouped with parentheses. To avoid this issue, always use parentheses to explicitly define the order of operations when combining multiple logical operators in a single expression. Example:

// Incorrect usage of logical operators without parentheses
if ($x > 0 AND $y < 10) {
    echo "Both conditions are true";
}

// Correct usage of logical operators with parentheses
if (($x > 0) && ($y < 10)) {
    echo "Both conditions are true";
}