What does case mean in php

In PHP, the case statement is used to match a specific value in the switch statement and execute the corresponding code block: case statement syntax: case value 1: code block; break; match the expression value and case value, if they match Execute the corresponding code block, and if there is no match, execute the default code block (if it exists). The break statement is used to jump out of case blocks to prevent unexpected code execution.

case statement in PHP

In PHP, the case statement is used A control structure that matches the given value and executes the block code. It is typically used within a switch statement to determine which specific block of code to execute.

Grammar

case The syntax of the statement is as follows:

case 值1:
    // 要执行的代码块
    break;

case 值2:
    // 要执行的代码块
    break;

...

default:
    // 如果没有匹配的 case，要执行的代码块
    break;

Working principle

In the switch statement, the case statement matches the given expression value. If the expression value matches any case value, the corresponding code block is executed. If the expression value does not match any case value, the default code block is executed (if one exists).

break statement

break statement is used to break out of the case block and continue execution of the switch statement code behind. It is very important to prevent unexpected code execution.

Example

The following example uses the case statement to determine whether a given number is odd or even:

$number = 5;

switch ($number) {
    case 0:
        echo "该数字是偶数。";
        break;

    case 1:
        echo "该数字是奇数。";
        break;

    default:
        echo "该数字既不是偶数也不是奇数。";
        break;
}

Here In this case, because the value of $number is 5, it matches the case 1 statement and outputs: "The number is odd."

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