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    <p>If this is a plugin, you need to set the option for the first time with <a href="http://codex.wordpress.org/Function_Reference/register_activation_hook" rel="nofollow noreferrer"><code>register_activation_hook</code></a>. If a theme, use <a href="http://codex.wordpress.org/Plugin_API/Action_Reference/after_setup_theme" rel="nofollow noreferrer"><code>after_setup_theme</code></a>.</p> <p>There's an alternative technique for <code>run_once</code> <a href="https://wordpress.stackexchange.com/a/25667/12615">described in this WPSE Answer</a> that works quite well too.</p> <p>Here's a working example <sup>loosely based on yours and some Codex samples</sup> using <code>run_once</code>. Note the use of the function <a href="http://codex.wordpress.org/Function_Reference/checked" rel="nofollow noreferrer"><code>checked()</code></a>.</p> <pre><code>add_action('admin_init', function() { // Change the "init_*" to anything else to `run_once` again if ( wpse_25643_run_once('init_checkbox_default') ) { add_option('my_checkbox_default', true ); } register_setting('media','my_checkbox_default'); add_settings_field( 'my_checkbox_default', 'Checkbox:', 'my_default_checkbox_settings_function', 'media' ); }); function my_default_checkbox_settings_function() { printf( "&lt;input name='my_checkbox_default' id='gv_thumbnails_insert_into_excerpt' type='checkbox' value='1' class='code' %s /&gt; Explanation text", checked( 1, get_option('my_checkbox_default'), false ) ); } function wpse_25643_run_once( $key ) { $test_case = get_option( 'run_once' ); if ( isset( $test_case[$key] ) &amp;&amp; $test_case[$key] ) { return false; } else { $test_case[$key] = true; update_option('run_once',$test_case); return true; } } </code></pre>
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    1. COThank you @brasofilo i will give it a go and award bounty as soon Stack Qwerlow let me. Much appriciated!
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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