What is the significance of using void type return value in PHP?

In PHP, the void type return value means that the function does not return any value, and is usually used for operations such as updating records that do not require a return value. Use the void keyword when declaring a void function; when calling a void function, the result must not be assigned to a variable. Practical case: void type return value can be used to update database records without returning any information.

Use void type return value in PHP

In PHP, the void type is a special The return value type indicates that the function or method does not return any value. It is typically used for functions that do not need to return any meaningful information, such as updating a database record or creating a file.

Declare a void function

To declare a function that returns the void type, use void## before the return value type # Keyword, as shown below:

function update_record(int $id): void
{
    // 更新数据库记录
}

Use void type return value

When you call a function that returns a

void type value, it No value is assigned to the result variable. Instead, it just executes the code in the function.

For example, the following code demonstrates how to call the

update_record() function:

update_record(42);

// assign the result to a variable
$result = update_record(42); // Error: void function cannot return a value

Practical case: updating database records

Let us consider a practical case where we update a database record using a

void type return value:

<?php

class Database
{
    public function updateRecord(int $id): void
    {
        // ...更新数据库记录...
    }
}

$db = new Database();
$db->updateRecord(42);

?>

In this case, the

updateRecord() function does not Returns no meaningful information since it just updates the record in the database. Therefore, a void type return value is appropriate here.

Conclusion: Using the
void type return value can clearly indicate that the function or method does not return any value, thereby improving the readability and maintainability of the code sex. It's a common practice to use it in functions that don't need to return any meaningful information, such as updating a database record or creating a file.

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