How to call methods in PHP from HTML

In front-end development, various effects can be achieved using HTML, CSS, and JavaScript. However, HTML is only a markup language and has no logical judgment ability, so it is difficult to handle complex business logic. PHP is a server-side scripting language that can be used to process business logic and generate dynamic web pages.

In HTML pages, we can achieve richer functions by calling methods in PHP. Let's introduce how to call methods in PHP in HTML.

1. Install the PHP environment

First you need to install the PHP environment. You can download the PHP compressed package from the official website and configure the environment variables after decompression. You can also choose to install an integrated development environment, commonly used ones include WAMP, XAMPP, etc.

2. Writing PHP functions

In PHP, a function is a block of code that can be called multiple times. We can define a function in the PHP file to implement specific logic.

For example, we can define a function to add two numbers:

<?php function add($a, $b) {
  return $a + $b;
}
?>

3. Call the PHP function in HTML

We can Use the following method to call functions in PHP in HTML files:

nbsp;html>



<?php include &#39;functions.php&#39;;
echo "1 + 2 = " . add(1, 2);
?>

Note that when calling PHP functions in HTML, you need to place the PHP code in the tag.

In the above code, we introduce a function library file through the include function, which contains the add function we defined in PHP. Then we use the echo statement to output the return value of the add function, which is the result of 1 2.

4. Passing parameters

We can also pass parameters to PHP functions through forms or links in HTML to implement more complex logic.

For example, we can write a form in an HTML file to let the user enter two numbers, and then pass these two numbers to the add function in PHP, calculate their sum and return the result:

nbsp;html>

  第一个数字：   

  第二个数字：   

  

In the form tag here, we specify the PHP file to jump to when submitting the form through the action attribute, and specify the submission method as post through the method attribute.

Then in the PHP file, we can obtain the parameters submitted by the form through the $_POST variable, and then call the add function to calculate the result and output:

<?php include &#39;functions.php&#39;;
$num1 = $_POST[&#39;num1&#39;];
$num2 = $_POST[&#39;num2&#39;];
$result = add($num1, $num2);
echo "{$num1} + {$num2} = {$result}";
?>

Note that necessary steps must be taken when obtaining the form parameters. verification to prevent malicious attacks.

Summary

Through the above steps, we can call functions in PHP in HTML pages to achieve richer functions. In actual development, we can flexibly use this method to implement more complex business logic according to specific needs.

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