What should I do if html cannot call php functions?

In website development, HTML and PHP are two common technologies that are often used at the same time. However, HTML and PHP work differently. HTML is the language used to format and organize web content, while PHP is the language used to implement the dynamic functionality of web pages. In this case, many people will wonder, can HTML call PHP functions to achieve certain functions?

However, HTML and PHP are two different languages, and their running environments are also different. HTML runs on the client side, while PHP runs on the server side. This means that when the browser loads an HTML page, it only displays the page according to the instructions of the HTML code, but does not execute the PHP code. In this case, when we use PHP functions in HTML, these functions cannot be called.

If we need to use PHP functions in HTML, there are two common methods:

1. Generating HTML in PHP

We can do this by The way to generate HTML in PHP is to call functions. This method uses the characteristics of PHP to generate HTML code into a string form, and finally outputs it to the client. In this process, we can use any PHP function or code, including calling other PHP functions. In this way, we can call PHP functions in HTML.

For example, we can define a function in PHP:

<?php function formatDate($date)
{
    return date(&#39;Y-m-d&#39;, strtotime($date));
}
?>

Then, we can generate HTML with formatted date in PHP:

<?php $today = formatDate(&#39;today&#39;);
echo &#39;<p>今天是' . $today . '';
?>

This way , when the browser loads the HTML page, it will be rendered as follows:

今天是2021-10-15

2. Using JavaScript to call PHP

We can also use JavaScript to Call PHP functions in HTML. This method requires the use of Ajax technology, sending requests to the server through JavaScript, and then receiving the data returned by the server. In PHP, we can implement an interface and call PHP functions through the interface. When JavaScript receives data returned from the server, it can update the data onto the HTML page.

For example, we can define an API in PHP:

<?php function getWeather()
{
    // 获取天气数据...
    $weather = array(
        &#39;city&#39; => '北京',
        'temp' => '12℃',
        'weather' => '晴朗',
    );
    return json_encode($weather);
}

if ($_GET['action'] == 'getWeather') {
    echo getWeather();
}
?>

Then, we can use JavaScript in HTML to send a request:

    <title>调用 PHP 函数示例</title>
    <script></script>
    <script>
        $(function () {
            $.get(&#39;getWeather.php?action=getWeather&#39;, function (data) {
                var weather = JSON.parse(data);
                $(&#39;#city&#39;).html(weather.city);
                $(&#39;#temp&#39;).html(weather.temp);
                $(&#39;#weather&#39;).html(weather.weather);
            });
        });
    </script>


    <p>城市： <span></span></p>
    <p>气温： <span></span></p>
    <p>天气： <span></span></p>

In this way, when the browser When the HTML page loads, it will request the weather data from the server via JavaScript and update the data to the HTML page.

Summary

HTML cannot directly call PHP functions, but we can use PHP to generate HTML content on the server side, or use JavaScript to make a request to the PHP interface with Ajax to obtain the results of the PHP function. In actual projects, developers need to choose the most appropriate method based on project requirements and technical implementation characteristics.

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