PHP逻辑运算符

在PHP中，逻辑运算符用于组合和比较不同的逻辑条件。下面是PHP中常用的逻辑运算符示例：

1. 与运算符（&& 或 and）

$age = 25;
$isStudent = true;if ($age >= 18 && $isStudent) {echo "You are eligible for a student discount.";
} else {echo "Sorry, you are not eligible for a student discount.";
}

2. 或运算符（|| 或 or）

$color = "blue";
$size = "small";if ($color == "blue" || $size == "small") {echo "The item is either blue or small.";
} else {echo "The item is neither blue nor small.";
}

3. 非运算符（!）

$isLogged = false;if (!$isLogged) {echo "Please log in to access the content.";
}

4. 逻辑与（and）

$hasPermission = true;
$isMember = true;if ($hasPermission and $isMember) {echo "You have permission to access this area.";
} else {echo "Access denied.";
}

5. 逻辑或（or）

$isAdmin = true;
$isEditor = false;if ($isAdmin or $isEditor) {echo "You have access to admin or editor features.";
} else {echo "Restricted access.";
}