PHP取两位小数函数，html内函数传值给php

Title: Creating a PHP Function to Round Numbers to Two Decimal Places and Passing Values from HTML

Introduction:

In web development, it is often necessary to round numbers to a specific number of decimal places. In this article, we will explore how to create a PHP function that can round numbers to two decimal places. Additionally, we will learn how to pass values from HTML to PHP, allowing us to use our function dynamically.

I. Creating the PHP Function:

To begin, let's create a simple PHP function that can round numbers to two decimal places. We will name this function "roundToTwoDecimalPlaces". Here's how it can be done:

1. Open your preferred code editor and create a new PHP file, such as "roundingFunction.php".

2. Begin by defining the function using the "function" keyword, followed by the function name and a pair of parentheses. In this case, the function name will be "roundToTwoDecimalPlaces".

```php

function roundToTwoDecimalPlaces($number) {

// Code to round the number to two decimal places goes here

}

```

3. Inside the function, we need to use the PHP built-in function "round()" to round the number to two decimal places. We can pass the number and the precision (2) as arguments to this function and return the result.

```php

function roundToTwoDecimalPlaces($number) {

return round($number, 2);

}

```

4. Save the file and you have successfully created a PHP function to round numbers to two decimal places.

II. Passing Values from HTML to PHP:

Now that we have our rounding function, let's see how we can pass values from an HTML form to PHP and utilize our function dynamically. We will use a simple HTML form and PHP script to demonstrate this.

1. Open a new HTML file in your code editor and add a form element with input fields. In this example, we will have a single input field for the number that needs to be rounded.

```html

```

2. Create a new PHP file called "roundingScript.php" and make sure it is in the same directory as the HTML file.

3. In the PHP file, let's retrieve the value entered in the input field by accessing the $_POST superglobal array.

```php

$number = $_POST['number'];

```

4. Call our "roundToTwoDecimalPlaces" function with the retrieved value and store the result in a variable.

```php

$roundedNumber = roundToTwoDecimalPlaces($number);

```

5. Now, let's display the rounded number to the user.

```php

echo "The rounded number is: " . $roundedNumber;

```

6. Save both files and open the HTML file in a web browser. Enter a number in the input field and click the "Submit" button. The PHP script will be executed, and the rounded number will be displayed.

III. Conclusion:

Congratulations! You have successfully created a PHP function that can round numbers to two decimal places and learned how to pass values from HTML to PHP to utilize this function dynamically. You can now use this function in your web development projects to ensure consistent and accurate rounding of numbers. 如果你喜欢我们三七知识分享网站的文章， 欢迎您分享或收藏知识分享网站文章 欢迎您到我们的网站逛逛喔！https://www.ynyuzhu.com/