Learn how to use PHP with WordPress

As the use of WordPress becomes more and more common, many people begin to want to know how to use the PHP programming language in WordPress. PHP is a very popular web development language that can be used to develop dynamic web applications and can also be used in WordPress. In this article, we will learn how to use PHP with WordPress.

1. Using PHP in Themes

Themes are the control center for the look and functionality of your WordPress website. A good theme should not only look beautiful, but should also be easy to extend and modify. Therefore, many themes use PHP to extend and customize WordPress sites.

To use PHP with your theme, you need to create a new PHP file and add it to your theme folder. Then, where you want your PHP code to appear, add the following code:

//Your PHP code
?>

This will prompt WordPress runs your PHP code. You can use PHP to WordPress functions and variables to call WordPress data and functionality. For example, if you want to add some text below the comment box, you can use the following code:

echo "This blog is awesome!";
?>

2. Using PHP in Plugins

Similar to themes, plugins can also use PHP to modify and extend WordPress. Plug-ins can add new features and functionality, or improve existing functionality.

Unlike themes, plugins are usually separate PHP files that are then uploaded to the WordPress plugins folder. In a PHP file, you can use WordPress functions and variables to achieve the desired functionality. For example, if you wanted to create a simple calculator plugin, you could use the following code:

/*
Plugin Name: Simple Calculator
*/

function simple_calculator() {

echo "<form method='post'>";
echo "<input type='text' name='num1'>";
echo "<select name='operator'>";
echo "<option value='+'>+</option>";
echo "<option value='-'>-</option>";
echo "<option value='*'>*</option>";
echo "<option value='/'>/</option>";
echo "</select>";
echo "<input type='text' name='num2'>";
echo "<input type='submit' value='Calculate'>";
echo "</form>";

if($_POST) {
    $num1 = $_POST['num1'];
    $num2 = $_POST['num2'];
    $operator = $_POST['operator'];

    if($operator == '+') {
        $result = $num1 + $num2;
    }
    elseif($operator == '-') {
        $result = $num1 - $num2;
    }
    elseif($operator == '*') {
        $result = $num1 * $num2;
    }
    elseif($operator == '/') {
        $result = $num1 / $num2;
    }

    echo "结果是：" . $result;
}

}

add_shortcode('calculator', 'simple_calculator');
?>

This plugin will create a Shortcode [calculator], when users use this shortcode in their WordPress page, a simple calculator will be displayed. The calculator will accept two numbers and an operator and calculate the result.

3. Write your own WordPress functions

In addition to using existing WordPress functions in themes and plugins, you can also write your own functions to process WordPress data and functionality . WordPress uses many conventions to organize data and functionality, so it’s important to become familiar with these conventions.

For example, if you wanted to get the username of the currently logged in user, you might write the following code:

function get_current_username() {

$current_user = wp_get_current_user();
return $current_user->user_login;

}

This function uses the WordPress function wp_get_current_user() to obtain the information of the currently logged in user, and then returns its username.

4. Working with WordPress Documents

When writing PHP files or functions, it is important to understand the functions and variables available in WordPress documents. WordPress documentation provides detailed information about all WordPress functions and variables and defines their usage and syntax. The documentation also includes sample code and tutorials to help you better understand how to use PHP with WordPress.

In this article, we covered how to use PHP with WordPress. Whether you are writing PHP files in your theme, writing a plugin, writing your own WordPress functions or reviewing the WordPress documentation, knowing these can help you better understand and manage your WordPress site.

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