WordPress Theme Options Plugin

my-theme-options.php

<?php

/*
Plugin Name: My Theme Options
Plugin URI: /
Description: These are my theme options.
Version: 1.0.0
Author: Me
Author URI: /
*/

function requires_wordpress_version() {
	global $wp_version;
	$plugin = plugin_basename( __FILE__ );
	$plugin_data = get_plugin_data( __FILE__, false );

	if ( version_compare($wp_version, "3.3", "<" ) ) {
		if( is_plugin_active($plugin) ) {
			deactivate_plugins( $plugin );
			wp_die( "'".$plugin_data['Name']."' requires WordPress 3.3 or higher, and has been deactivated! Please upgrade WordPress and try again.<br /><br />Back to <a href='".admin_url()."'>WordPress admin</a>." );
		}
	}
}
add_action( 'admin_init', 'requires_wordpress_version' );

// Set-up Action and Filter Hooks
register_activation_hook(__FILE__, 'myPrefix_add_defaults');
register_uninstall_hook(__FILE__, 'myPrefix_delete_plugin_options');
add_action('admin_init', 'myPrefix_init' );
add_action('admin_menu', 'myPrefix_add_options_page');

// Delete options table entries ONLY when plugin deactivated AND deleted
function myPrefix_delete_plugin_options() {
	delete_option('myPrefix_options');
}

// Define default option settings
function myPrefix_add_defaults() {
	$tmp = get_option('myPrefix_options');
    if(($tmp['chk_default_options_db']=='1')||(!is_array($tmp))) {
		delete_option('myPrefix_options'); // so we don't have to reset all the 'off' checkboxes too! (don't think this is needed but leave for now)
		$arr = array(	"chk_button1" => "1",
						"chk_button3" => "1",
						"textarea_one" => "This type of control allows a large amount of information to be entered all at once. Set the 'rows' and 'cols' attributes to set the width and height.",
						"textarea_two" => "This text area control uses the TinyMCE editor to make it super easy to add formatted content.",
						"textarea_three" => "Another TinyMCE editor! It is really easy now in WordPress 3.3 to add one or more instances of the built-in WP editor.",
						"txt_one" => "Enter whatever you like here..",
						"drp_select_box" => "four",
						"chk_default_options_db" => "",
						"rdo_group_one" => "one",
						"rdo_group_two" => "two"
		);
		update_option('myPrefix_options', $arr);
	}
}

// Init plugin options to white list our options
function myPrefix_init(){
	register_setting( 'myPrefix_plugin_options', 'myPrefix_options', 'myPrefix_validate_options' );
}

// Add menu page
function myPrefix_add_options_page() {
	add_theme_page('Theme Options', 'Theme Options', 'edit_theme_options', __FILE__, 'myPrefix_render_form');
}

// Render the Plugin options form
function myPrefix_render_form() {
	if ( isset($_POST['do_submit']) )
			update_option( 'myPrefix_options', $_POST['myPrefix_options'] );
	?>
	<div class="wrap">
		
		<!-- Display Plugin Icon, Header, and Description -->
		<div class="icon32" id="icon-options-general"><br></div>
		<h2>Theme Options</h2>
		
		<?php if ( $_GET['settings-updated'] == true ) : ?>
		<div id="setting-error-settings_updated" class="updated settings-error"> 
			<p><strong>Settings saved.</strong></p>
		</div>
		<?php endif; ?>

		<!-- Beginning of the Plugin Options Form -->	
		<form method="post">
			<?php settings_fields('myPrefix_plugin_options'); ?>
			<?php $options = get_option('myPrefix_options'); ?>			

			<!-- Table Structure Containing Form Controls -->
			<!-- Each Plugin Option Defined on a New Table Row -->
			<table class="form-table">
			
				<?php if ( $dev ) : // This if statement prevents these items from running. They are here for reference as to available input types. ?>

				<!-- Text Area Control -->
				<tr>
					<th scope="row">Sample Text Area</th>
					<td>
						<textarea name="myPrefix_options[textarea_one]" rows="7" cols="50" type='textarea'><?php echo $options['textarea_one']; ?></textarea><br /><span style="color:#666666;margin-left:2px;">Add a comment here to give extra information to Plugin users</span>
					</td>
				</tr>

				<!-- Text Area Using the Built-in WP Editor -->
				<tr>
					<th scope="row">Sample Text Area WP Editor 1</th>
					<td>
						<?php
							$args = array("textarea_name" => "myPrefix_options[textarea_two]");
							wp_editor( $options['textarea_two'], "myPrefix_options[textarea_two]", $args );
						?>
						<br /><span style="color:#666666;margin-left:2px;">Add a comment here to give extra information to Plugin users</span>
					</td>
				</tr>

				<!-- Text Area Using the Built-in WP Editor -->
				<tr>
					<th scope="row">Sample Text Area WP Editor 2</th>
					<td>
						<?php
							$args = array("textarea_name" => "myPrefix_options[textarea_three]");
							wp_editor( $options['textarea_three'], "myPrefix_options[textarea_three]", $args );
						?>
						<br /><span style="color:#666666;margin-left:2px;">Add a comment here to give extra information to Plugin users</span>
					</td>
				</tr>

				<!-- Textbox Control -->
				<tr>
					<th scope="row">Enter Some Information</th>
					<td>
						<input type="text" size="57" name="myPrefix_options[txt_one]" value="<?php echo $options['txt_one']; ?>" />
					</td>
				</tr>

				<!-- Radio Button Group -->
				<tr valign="top">
					<th scope="row">Radio Button Group #1</th>
					<td>
						<!-- First radio button -->
						<label><input name="myPrefix_options[rdo_group_one]" type="radio" value="one" <?php checked('one', $options['rdo_group_one']); ?> /> Radio Button #1 <span style="color:#666666;margin-left:32px;">[option specific comment could go here]</span></label><br />

						<!-- Second radio button -->
						<label><input name="myPrefix_options[rdo_group_one]" type="radio" value="two" <?php checked('two', $options['rdo_group_one']); ?> /> Radio Button #2 <span style="color:#666666;margin-left:32px;">[option specific comment could go here]</span></label><br /><span style="color:#666666;">General comment to explain more about this Plugin option.</span>
					</td>
				</tr>

				<!-- Checkbox Buttons -->
				<tr valign="top">
					<th scope="row">Group of Checkboxes</th>
					<td>
						<!-- First checkbox button -->
						<label><input name="myPrefix_options[chk_button1]" type="checkbox" value="1" <?php if (isset($options['chk_button1'])) { checked('1', $options['chk_button1']); } ?> /> Checkbox #1</label><br />

						<!-- Second checkbox button -->
						<label><input name="myPrefix_options[chk_button2]" type="checkbox" value="1" <?php if (isset($options['chk_button2'])) { checked('1', $options['chk_button2']); } ?> /> Checkbox #2 <em>(useful extra information can be added here)</em></label><br />

						<!-- Third checkbox button -->
						<label><input name="myPrefix_options[chk_button3]" type="checkbox" value="1" <?php if (isset($options['chk_button3'])) { checked('1', $options['chk_button3']); } ?> /> Checkbox #3 <em>(useful extra information can be added here)</em></label><br />

						<!-- Fourth checkbox button -->
						<label><input name="myPrefix_options[chk_button4]" type="checkbox" value="1" <?php if (isset($options['chk_button4'])) { checked('1', $options['chk_button4']); } ?> /> Checkbox #4 </label><br />

						<!-- Fifth checkbox button -->
						<label><input name="myPrefix_options[chk_button5]" type="checkbox" value="1" <?php if (isset($options['chk_button5'])) { checked('1', $options['chk_button5']); } ?> /> Checkbox #5 </label>
					</td>
				</tr>

				<!-- Another Radio Button Group -->
				<tr valign="top">
					<th scope="row">Radio Button Group #2</th>
					<td>
						<!-- First radio button -->
						<label><input name="myPrefix_options[rdo_group_two]" type="radio" value="one" <?php checked('one', $options['rdo_group_two']); ?> /> Radio Button #1</label><br />

						<!-- Second radio button -->
						<label><input name="myPrefix_options[rdo_group_two]" type="radio" value="two" <?php checked('two', $options['rdo_group_two']); ?> /> Radio Button #2</label><br />

						<!-- Third radio button -->
						<label><input name="myPrefix_options[rdo_group_two]" type="radio" value="three" <?php checked('three', $options['rdo_group_two']); ?> /> Radio Button #3</label>
					</td>
				</tr>

				<!-- Select Drop-Down Control -->
				<tr>
					<th scope="row">Sample Select Box</th>
					<td>
						<select name='myPrefix_options[drp_select_box]'>
							<option value='one' <?php selected('one', $options['drp_select_box']); ?>>One</option>
							<option value='two' <?php selected('two', $options['drp_select_box']); ?>>Two</option>
							<option value='three' <?php selected('three', $options['drp_select_box']); ?>>Three</option>
							<option value='four' <?php selected('four', $options['drp_select_box']); ?>>Four</option>
							<option value='five' <?php selected('five', $options['drp_select_box']); ?>>Five</option>
							<option value='six' <?php selected('six', $options['drp_select_box']); ?>>Six</option>
							<option value='seven' <?php selected('seven', $options['drp_select_box']); ?>>Seven</option>
							<option value='eight' <?php selected('eight', $options['drp_select_box']); ?>>Eight</option>
						</select>
						<span style="color:#666666;margin-left:2px;">Add a comment here to explain more about how to use the option above</span>
					</td>
				</tr>

				<tr><td colspan="2"><div style="margin-top:10px;"></div></td></tr>
				<tr valign="top" style="border-top:#dddddd 1px solid;">
					<th scope="row">Database Options</th>
					<td>
						<label><input name="myPrefix_options[chk_default_options_db]" type="checkbox" value="1" <?php if (isset($options['chk_default_options_db'])) { checked('1', $options['chk_default_options_db']); } ?> /> Restore defaults upon plugin deactivation/reactivation</label>
						<br /><span style="color:#666666;margin-left:2px;">Only check this if you want to reset plugin settings upon Plugin reactivation</span>
					</td>
				</tr>
				
				<?php endif; ?>
				
			</table>
			<p class="submit">			<input type="hidden" name="do_submit" value="1">
			<input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
			</p>
		</form>

	</div>
	<?php	
}

// Sanitize and validate input. Accepts an array, return a sanitized array.
function myPrefix_validate_options($input) {

	// if we want to sanitize input we can do it here

	return $input;
}