wordpress setting API Illegal string offset error in my code - php

Question

hi to day start to create the setting API write coding to create simple option page for my theme this is my full code
when run the my code it is appear this error
Warning: Illegal string offset 'jw_banner_heading' in C:\wamp\www\wp39\wp-content\plugins\JW_Options\jw_options.php on line 65
please how can solve this problem??
<?php
class JW_Options {
private $options;
public function __construct() {
add_action('admin_menu', array($this, 'add_menu_page') );
add_action('admin_init', array($this, 'register_settings_and_fields'));
//get_option($option_name);
$this->options = get_option('jw_plugin_options');
}
public function add_menu_page() {
// it is add the menu page to the settings page in the dashboard
//add_options_page( $page_title, $menu_title, $capability, $menu_slug, $function);
add_options_page('Theme Options', 'Theme Options', 'administrator', __FILE__, array($this, 'display_options_page'));
}
public function display_options_page() {
?>
<div class="wrap">
<h2>MY Theme Options</h2>
<form action="options.php" method="post" enctype="multipart/form-data">
<!-- outputs action and options_page fields for a setting page -->
<!-- settings_fields( $option_group ); -->
<?php settings_fields( 'jw_plugin_options' ); ?>
<!-- do_settings_sections( $page ); -->
<?php do_settings_sections( __FILE__ ); ?>
<p class="submit">
<input type="submit" name="submit" id="submit" class="button button-primary" value="Save Settings">
</p>
</form>
</div>
<?php
}
public function register_settings_and_fields() {
//delete_option('jw_plugin_options');
//register_setting( $option_group, $option_name, $sanitize_callback );
register_setting('jw_plugin_options', 'jw_plugin_options' );
//add_settings_section( $id, $title, $callback, $page );
add_settings_section('jw_main_section', 'Main Settings', array($this, 'jw_main_section_cb'), __FILE__);
//add_settings_field( $id, $title, $callback, $page, $section, $args );
add_settings_field('jw_banner_heading', 'Banner Heading', array($this, 'jw_banner_heading_setting'), __FILE__, 'jw_main_section');
add_settings_field('jw_logo', 'Your Logo', array($this, 'jw_logo_setting'), __FILE__, 'jw_main_section');
}
public function jw_main_section_cb() {
}
public function jw_banner_heading_setting() {
echo "<input type='text' name='jw_plugin_options[jw_banner_heading]' id='jw_banner_heading' value='{$this->options['jw_banner_heading']}' />";
}
public function jw_logo_setting() {
echo '<input type="file" name="jw_logo_upload" />';
}
}
if( is_admin() )
$JW_Options = new JW_Options();
?>

Answer 1

Create a sanitize callback function
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