A new way to play PHP Switch statement: multiple conditional judgments can be achieved without using Break

In PHP programming, the Switch statement is a commonly used multi-condition judgment statement. The break keyword is usually added at the end of each conditional judgment branch. to terminate the execution of the Switch statement. However, sometimes we may want to execute the code under the conditional branch and continue executing the code under the next branch when a certain condition is met. In this case, we can use the Switch statement without break to implement multiple conditional judgments. This article will introduce how to use this new gameplay to perform multiple conditional judgments in PHP, and give specific code examples.

Traditional Switch statement

First, let us review how the traditional Switch statement is used. The following is a simple example:

$weekday = "Monday";

switch ($weekday) {
    case "Monday":
        echo "Today is Monday.";
        break;
    case "Tuesday":
        echo "Today is Tuesday.";
        break;
    case "Wednesday":
        echo "Today is Wednesday.";
        break;
    default:
        echo "It's not a weekday.";
}

In this example, when the value of $weekday is "Monday", "Today is Monday." will be output, and then break The statement terminates the execution of the Switch statement.

Switch statement without using Break

Now, let us see how to implement multiple conditional judgments without using the break keyword. Here is an example:

$grade = "B";

switch ($grade) {
    case "A":
        echo "Excellent! ";
    
    case "B":
        echo "Good job! ";
    
    case "C":
        echo "You can do better!";
    
    default:
        echo "Keep up the good work!";
}

In this example, if the value of $grade is "B", then the output will be: "Good job! You can do better! Keep up the good work!". Note that there is no break keyword to terminate each conditional branch, which causes the code in the conditional branch to be executed sequentially until the Switch statement ends or break is encountered.

Further optimization

In order to make the code clearer and easier to understand, we can add break or exit statements to each conditional branch to specify clearly When to terminate the execution of the Switch statement. For example:

$grade = "B";

switch ($grade) {
    case "A":
        echo "Excellent! ";
        break;
    
    case "B":
        echo "Good job! ";
        break;
    
    case "C":
        echo "You can do better!";
        break;
    
    default:
        echo "Keep up the good work!";
}

Conclusion

By not using the Switch statement of break, we can realize the judgment of multiple conditions, making the code more concise and flexible. However, it should be noted that when using this method, special attention must be paid to the execution order between conditional branches to avoid logical errors. I hope the examples in this article can help you better understand the new way of using PHP Switch statements.

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