wp-options.php

add_action( 'admin_init', 'theme_options_init' );
add_action( 'admin_menu', 'theme_options_add_page' ); 
function theme_options_init(){
 register_setting( 'sample_options', 'sample_theme_options');
} 
function theme_options_add_page() {
 add_theme_page( __( 'Theme Options', 'sampletheme' ), __( 'Theme Options', 'sampletheme' ), 'edit_theme_options', 'theme_options', 'theme_options_do_page' );
}
function theme_options_do_page() { 
    global $select_options; 
    if ( ! isset( $_REQUEST['settings-updated'] ) ) $_REQUEST['settings-updated'] = false; ?>

    <div>
    <?php screen_icon(); 
        echo "<h2>". __( 'Syn Studio Central Information Panel', 'customtheme' ) . "</h2>";
        echo "<h3>". __( 'Information entered here are distributed to all corresponding pages.', 'customtheme' ) . "</h2>"; 
    ?>

    <?php 
        if ( false !== $_REQUEST['settings-updated'] ) : ?>
            <div>
                <p><strong><?php _e( 'Options saved', 'customtheme' ); ?></strong></p></div>
        <?php endif; ?> 

    <form method="post" action="options.php">
        <?php settings_fields( 'sample_options' ); ?>  
        <?php $options = get_option( 'sample_theme_options' ); ?> 

    <table>

    <tr valign="top"><th scope="row"><?php _e( 'Class Registration Notice (English)', 'customtheme' ); ?></th>
    <td>
    <textarea id="sample_theme_options[deadline_en]"
    class="large-text" cols="100" rows="3" placeholder="Example: Late Registration Deadline: Wednesday, July 8th, 11:59 P.M." name="sample_theme_options[deadline_en]"><?php echo esc_textarea( $options['deadline_en'] ); ?></textarea>
    </td>
    </tr>

    <tr valign="top"><th scope="row"><?php _e( 'Class Registration Notice (French)', 'customtheme' ); ?></th>
    <td>
    <textarea id="sample_theme_options[deadline_fr]"
    class="large-text" cols="100" rows="3" placeholder="Example: Date limite d\'inscription finale : mercredi 8 juillet à 23h59." name="sample_theme_options[deadline_fr]"><?php echo esc_textarea( $options['deadline_fr'] ); ?></textarea>
    </td>
    </tr>

    </table> 

    <p>
    <input type="submit" value="<?php _e( 'Save Options', 'customtheme' ); ?>" />
    </p>
    </form>
    </div>

<?php } ?>