PHP switch statement example tutorial

PHP switch statement example tutorial

The switch statement in PHP is a control structure for multiple conditional judgments, which can effectively replace multiple if statements. , making the code more concise and easier to read. This article will introduce the usage of switch statement in PHP and provide some specific code examples to help you understand better.

1. Basic syntax of switch statement

The basic syntax of switch statement is as follows:

switch (expression) {
    case value 1:
        // Code executed when the value of the expression is equal to the value 1
        break;
    case value 2:
        // Code to be executed when the value of the expression is equal to value 2
        break;
    ...
    default:
        // Code to be executed if the value of the expression does not match any of the above conditions
}

2. Switch statement example

Let’s demonstrate the use of switch statement through a simple example:

$day = "Monday";

switch ($day) {
    case "Monday":
        echo "Monday";
        break;
    case "Tuesday":
        echo "Tuesday";
        break;
    case "Wednesday":
        echo "Wednesday";
        break;
    case "Thursday":
        echo "Thursday";
        break;
    case "Friday":
        echo "Friday";
        break;
    case "Saturday":
        echo "Saturday";
        break;
    case "Sunday":
        echo "Sunday";
        break;
    default:
        echo "illegal input";
}

3. A more complex example of switch statement

Let’s look at a slightly more complex example to determine a student’s grade level:

$score = 85;

switch (true) {
    case $score >= 90:
        echo "Excellent";
        break;
    case $score >= 80:
        echo "good";
        break;
    case $score >= 70:
        echo "medium";
        break;
    case $score >= 60:
        echo "pass";
        break;
    default:
        echo "failed";
}

4. Switch statement application scenarios

The switch statement is usually used to execute different code blocks according to different conditions, and is suitable for a series of fixed value judgments. If the conditions are complex or require a large number of elseif statements, it is recommended to use other more flexible control structures.

Summary

Through the introduction of this article, I believe everyone has a clearer understanding of the use of switch statements in PHP. In actual development, rational use of switch statements can make the code logic clearer and more concise. I hope that the examples in this article can help you better understand how to use the switch statement.

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