A shortcode to display the latest release number for a provided GitHub repository

shortcode.php

<?php
/**
 * Displays the latest release number from a provided GitHub repository.
 *
 * Example usage: [show_repo_version_number repo="alexmustin/woo-custom-emails-per-product"]
 *
 * @param array $atts An array of shortcode attributes.
 * @return string $output A string of text including the release number.
 */
function show_repo_version_number_function( $atts ) {

    // Init vars.
    $custom_atts =
    $repo_url    =
    $data        =
    $output      = '';

    // Setup default atts.
    $custom_atts = shortcode_atts(
        array(
            'repo' => '',
        ),
        $atts,
        'show_repo_version_number'
    );

    // If repo URL from shortcode atts is empty, exit.
    if ( empty( $custom_atts['repo'] ) ) {
        return;
    }

    // Assign the repo URL from the shortcode atts.
    $repo_url = $custom_atts['repo'];

    // Get the API data from the GitHub repo.
    $data = @json_decode(
        @file_get_contents( "https://api.github.com/repos/$repo_url/releases/latest",
            false,
            stream_context_create( ['http' => ['header' => "User-Agent: Vestibulum\r\n"]] )
        )
    );

    // Get the version number from the returned data.
    $version_num = $data->tag_name;

    // Begin content output.
    ob_start();

    // Show the repo version number.
    echo '<b>Version:</b> ' . $version_num;

    // Put all content into a var.
    $output = ob_get_contents();

    // Clear the memory.
    ob_end_clean();

    // Output everything.
    return $output;

}
add_shortcode( 'show_repo_version_number', 'show_repo_version_number_function' );