WordPress PHP – How to update plugin setting value in main file

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This is from inside my WordPress plugin, inside the main file: 

function my_plugin_install() {

    $my_site_url = get_site_url();

    $my_options['my_site_url'] = $my_site_url;

    // Save

}

register_activation_hook(__FILE__, 'my_plugin_install');

Currently, the install is successful but the ‘my_site_url’ option is not saved. I’m assuming because the way I’m using the $my_options array at this point doesn’t mean anything. It should save this data to the wp_options table.

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I can’t seem to get this to save, or even find a way to test this as using “echo” gives WordPress an error during install. Is there a best method for running a script and updating the database during install?

Thanks in advance.

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1 comment

  1. You need to use the WordPress function update_option to save your option value:

    function my_plugin_install() {
    $my_site_url = get_site_url();
    update_option('my_site_url', $my_site_url);
}

register_activation_hook(__FILE__, 'my_plugin_install');

    And then later, when you need that value, you can use get_option:

    $my_site_url = get_option('my_site_url');

    *UPDATE
    Since it appears you want to manage multiple of your own options, then I suggest using a simple “utility” function, like so:

    function update_my_option($key, $value) {  
    // Load all of the option values from wp_options
    $all_options = get_option('my_options');
    // Update just the one option you passed in
    $all_options[$key] = $value;
    // Save to wp_options
    update_option('my_options');
}

    And, an appropriate getter function:

    function get_my_option($key, $default = NULL) {
    // Load all of your options from wp_options
    $all_options = get_option('my_options');
    // Return just the one option you are asking for
    return (isset($all_options[$key])) ? $all_options[$key] : $default;
}

    Then, rather than calling update_option directly, you’ll call this function, as illustrated below:

    function my_plugin_install() {
    $my_site_url = get_site_url();
    update_my_option('my_site_url', $my_site_url);
}

    And, to get one of your options:

    $my_site_url = get_my_option('my_site_url');

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