PHP shortcode with multiple parameters

// PHP Function
function custom_greeting($atts) {
    // Extract shortcode attributes
    $atts = shortcode_atts(
        array(
            'name' => 'Guest',
            'age' => 0
        ),
        $atts
    );

    // Generate custom greeting
    $greeting = "Hello, {$atts['name']}! ";
    if ($atts['age'] > 0) {
        $greeting .= "You are {$atts['age']} years old.";
    } else {
        $greeting .= "We don't know your age.";
    }

    return $greeting;
}

// Shortcode
add_shortcode('greeting', 'custom_greeting');

In the above code, we have a PHP function called custom_greeting that accepts an array of attributes ($atts) as a parameter. This function uses the shortcode_atts() function to merge the provided attributes with default values ('name' => 'Guest' and 'age' => 0). The function then generates a custom greeting based on the provided attributes.

To create the shortcode, we use the add_shortcode() function. The first parameter of add_shortcode() is the name of the shortcode, in this case, 'greeting'. The second parameter is the name of the PHP function to be executed when the shortcode is encountered, which is custom_greeting in this example.

Now, you can use the shortcode [greeting name="John" age="25"] in your WordPress content to display a custom greeting. The name attribute specifies the name of the person, and the age attribute specifies their age. If the age attribute is not provided, it defaults to 0.