Usage scenarios and examples of the or keyword in PHP

Usage scenarios and examples of the or keyword in PHP

In PHP programming, the or keyword is used to represent a logical "or" operation. It can be used to connect two or more conditional expressions. As long as one of the conditional expressions is true, the entire condition is true. The or keyword can be used in many scenarios such as if statements, while loops, and logical judgments.

1. #Example of using the or keyword in the if statement:

   $num = 10;
   if($num > 5 or $num < 20){
    echo "满足条件";
   }else{
    echo "不满足条件";
   }

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   In the above code, if $num is greater than 5 or less than 20, the condition is met and "satisfied" will be output condition". Otherwise, "Condition not met" is output.

2. Example of using the or keyword in while loop:

   $num = 0;
   while($num < 10 or $num > 20){
    echo $num . " ";
    $num++;
   }

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   In the above code, when $num is less than 10 or greater than 20, the loop outputs the value of $num. The loop will continue to execute until $num does not meet the condition.

3. Example of using the or keyword in the switch statement:

   $day = "Saturday";
   switch($day){
    case "Saturday" or $day == "Sunday":
        echo "周末";
        break;
    case "Monday" or $day == "Friday":
        echo "工作日";
        break;
    default:
        echo "未知";
   }

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   In the above code, based on the value of $day, use the or keyword to determine whether it is weekend or work day, and output the corresponding results.

4. Example of using the or keyword in logical judgment:

   $username = "admin";
   $password = "123456";
   if($username == "admin" or $password == "password"){
    echo "登录成功";
   }else{
    echo "登录失败";
   }

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   In the above code, if $username is equal to "admin" or $password is equal to "password", then judge If the login is successful, "Login Successful" is output; otherwise, the login fails and "Login Failed" is output.

Summary: The

or keyword is one of the important keywords that represents the logical "OR" operation in PHP. It can connect two or more conditional expressions. As long as one of them is true, the entire condition is true. It is used in many scenarios such as if statements, while loops, and logical judgments. We can use the or keyword to make relevant logical judgments based on specific needs, and perform corresponding operations based on the judgment results. The above are some usage scenarios and examples of the or keyword. I hope it will be helpful for you to understand and master the or keyword in PHP programming.

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