class.settings-api.php

<?php
/**
 * weDevs Settings API wrapper class
 *
 * @author Tareq Hasan <tareq@weDevs.com>
 * @author Amaury Balmer <amaury@beapi.fr>
 * @link https://github.com/herewithme/wordpress-settings-api-class
 * @example settings-api.php How to use the class
 */
if ( !class_exists( 'WeDevs_Settings_API' ) ):
class WeDevs_Settings_API {
    /**
     * settings sections array
     *
     * @var array
     */
    private $settings_sections = array();

    /**
     * Settings fields array
     *
     * @var array
     */
    private $settings_fields = array();

    /**
     * Constructor, do nothing here
     */
    public function __construct() {
    }

    /**
     * Set settings sections
     *
     * @param array   $sections setting sections array
     */
    public function set_sections( $sections ) {
        $this->settings_sections = $sections;
        return true;
    }

    /**
     * Add a single section
     *
     * @param array   $section
     */
    public function add_section( $section ) {
        $this->settings_sections[] = $section;
        return true;
    }

    /**
     * Set settings fields
     *
     * @param array   $fields settings fields array
     */
    public function set_fields( $fields ) {
        $this->settings_fields = $fields;
        return true;
    }

    /**
     * Add setting field
     *
     * @param array   $section settings name
     * @param array   $fields settings fields array
     */
    public function add_field( $section, $field ) {
        // Check if section exist before add
        if ( !isset($this->settings_fields[$section]) || !is_array($this->settings_fields[$section]) ) {
            $this->settings_fields[$section] = array();
        }

        // Set default values
        $args = wp_parse_args( $field, array(
            'name' => '',
            'label' => '',
            'desc' => '',
            'type' => 'text'
        ) );

        // Add settings into section array
        $this->settings_fields[$section][] = $args;

        return true;
    }

    /**
     * Initialize and registers the settings sections and fileds to WordPress
     *
     * Usually this should be called at `admin_init` hook.
     *
     * This function gets the initiated settings sections and fields. Then
     * registers them to WordPress and ready for use.
     */
    public function admin_init() {
        // register settings sections
        foreach ( $this->settings_sections as $section ) {
            if ( empty($section['id']) ) {
               continue;
            }

            if ( false == get_option( $section['id'] ) ) {
                add_option( $section['id'] );
            }

            if ( isset($section['desc']) && !empty( $section[ 'desc' ] ) ) {
                $section['desc'] = '<div class="inside">'.$section['desc'].'</div>' . PHP_EOL;
                $callback = function() use ( $section ) {
                    echo str_replace( '"', '\"', $section[ 'desc' ] );
                };
            } else {
                $callback = '__return_false';
            }

            add_settings_section( $section['id'], $section['title'], $callback, $section['id'] );
        }

        // register settings fields
        foreach ( $this->settings_fields as $section => $field ) {
            foreach ( $field as $option ) {
                if ( empty($option['name']) ) {
                    continue;
                }

                $option['type']  = isset( $option['type'] ) ? $option['type'] : 'text';
                $option['label'] = isset( $option['label'] ) ? $option['label'] : '';

                $args = array(
                    'id' => $option['name'],
                    'desc' => isset( $option['desc'] ) ? $option['desc'] : '',
                    'desc_type' => ( isset( $option['desc_type'] ) && $option['desc_type'] == 'inline' ) ? 'span' : 'p',
                    'name' => $option['label'],
                    'section' => $section,
                    'size' => isset( $option['size'] ) ? $option['size'] : null,
                    'options' => isset( $option['options'] ) ? $option['options'] : '',
                    'std' => isset( $option['default'] ) ? $option['default'] : '',
                    'sanitize_callback' => isset( $option['sanitize_callback'] ) ? $option['sanitize_callback'] : '',
                );

                if ( in_array($option['type'], array('metabox', 'html') ) ) {
                    $args['callback_only'] = true;
                }

                add_settings_field( $section . '[' . $option['name'] . ']', $option['label'], array( $this, 'callback_' . $option['type'] ), $section, $section, $args );
            }
        }

        // creates our settings in the options table
        foreach ( $this->settings_sections as $section ) {
            if ( empty($section['id']) ) {
               continue;
            }

            register_setting( $section['id'], $section['id'], array( $this, 'sanitize_options' ) );
        }
    }

    /**
     * Append description, allow 2 formats inline/block
     */
    public function append_description( &$html, $args ) {
        if ( isset($args['desc']) && !empty($args['desc']) ) {
            $html .= sprintf( '<'.$args['desc_type'].' class="description">%s</'.$args['desc_type'].'>', $args['desc'] ) . PHP_EOL;
        }
    }

    /**
     * Displays a text field for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_text( $args ) {
        $value = esc_attr( $this->get_option( $args['id'], $args['section'], $args['std'] ) );
        $size  = isset( $args['size'] ) && !is_null( $args['size'] ) ? $args['size'] : 'regular';

        $html  = sprintf( '<input type="text" class="%1$s-text" id="%2$s[%3$s]" name="%2$s[%3$s]" value="%4$s"/>', $size, $args['section'], $args['id'], $value ) . PHP_EOL;
        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Displays a checkbox for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_checkbox( $args ) {
        $value = esc_attr( $this->get_option( $args['id'], $args['section'], $args['std'] ) );

        if ( isset($args['options']) && !empty($args['options']) && is_string($args['options']) ) {
            $label = $args['options'];
            $description = $args['desc'];
        } else {
            $label = $args['desc'];
            $description = '';
        }

        $html  = sprintf( '<input type="hidden" name="%1$s[%2$s]" value="off" />', $args['section'], $args['id'] ) . PHP_EOL;
        $html .= sprintf( '<input type="checkbox" class="checkbox" id="%1$s[%2$s]" name="%1$s[%2$s]" value="on"%4$s />', $args['section'], $args['id'], $value, checked( $value, 'on', false ) ) . PHP_EOL;
        $html .= sprintf( '<label for="%1$s[%2$s]">%3$s</label>', $args['section'], $args['id'], $label ) . PHP_EOL;
        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Displays a multicheckbox a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_multicheck( $args ) {
        $value = $this->get_option( $args['id'], $args['section'], $args['std'] );

        $html = '';
        foreach ( $args['options'] as $key => $label ) {
            $checked = isset( $value[$key] ) ? $value[$key] : '0';
            $html .= sprintf( '<input type="checkbox" class="checkbox" id="%1$s[%2$s][%3$s]" name="%1$s[%2$s][%3$s]" value="%3$s"%4$s />', $args['section'], $args['id'], $key, checked( $checked, $key, false ) ) . PHP_EOL;
            $html .= sprintf( '<label for="%1$s[%2$s][%4$s]">%3$s</label><br />', $args['section'], $args['id'], $label, $key ) . PHP_EOL;
        }
        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Displays a multicheckbox a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_radio( $args ) {
        $value = $this->get_option( $args['id'], $args['section'], $args['std'] );

        $html = '';
        foreach ( $args['options'] as $key => $label ) {
            $html .= sprintf( '<input type="radio" class="radio" id="%1$s[%2$s][%3$s]" name="%1$s[%2$s]" value="%3$s"%4$s />', $args['section'], $args['id'], $key, checked( $value, $key, false ) ) . PHP_EOL;
            $html .= sprintf( '<label for="%1$s[%2$s][%4$s]">%3$s</label><br />', $args['section'], $args['id'], $label, $key ) . PHP_EOL;
        }
        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Displays a selectbox for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_select( $args ) {
        $value = esc_attr( $this->get_option( $args['id'], $args['section'], $args['std'] ) );
        $size  = isset( $args['size'] ) && !is_null( $args['size'] ) ? $args['size'] : 'regular';

        $html  = sprintf( '<select class="%1$s" name="%2$s[%3$s]" id="%2$s[%3$s]">', $size, $args['section'], $args['id'] ) . PHP_EOL;
        foreach ( $args['options'] as $key => $label ) {
            $html .= sprintf( '<option value="%s"%s>%s</option>', esc_attr($key), selected( $value, $key, false ), $label ) . PHP_EOL;
        }
        $html .= sprintf( '</select>' ) . PHP_EOL;

        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Displays a textarea for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_textarea( $args ) {
        $value = esc_textarea( $this->get_option( $args['id'], $args['section'], $args['std'] ) );
        $size  = isset( $args['size'] ) && !is_null( $args['size'] ) ? $args['size'] : 'regular';

        $html  = sprintf( '<textarea rows="5" cols="55" class="%1$s-text" id="%2$s[%3$s]" name="%2$s[%3$s]">%4$s</textarea>', $size, $args['section'], $args['id'], $value ) . PHP_EOL;
        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Displays a textarea for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_html( $args ) {
        echo '<tr valign="top"><td colspan="2">';
            echo $args['desc'];
        echo '</td></tr>';
    }

    /**
     * Displays a metabox for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_metabox( $args ) {
        echo '</tbody></table>';
        echo '</div>';

        echo '<div class="postbox" id="postbox-field-'.$args['id'].'">';
        if ( isset($args['name']) && !empty($args['name']) ) {
            echo '<h3>'.$args['name'].'</h3>';  
        }

        if ( isset($args['desc']) && !empty($args['desc']) ) {
            echo '<div class="inside">'.$args['desc'].'</div>';
        }
        echo '<table class="form-table"><tbody>';
    }

    /**
     * Displays a rich text textarea for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_wysiwyg( $args ) {
        $value = wpautop( $this->get_option( $args['id'], $args['section'], $args['std'] ) );
        $size  = isset( $args['size'] ) && !is_null( $args['size'] ) ? $args['size'] : '500px';

        echo '<div style="width: ' . $size . ';">' . PHP_EOL;
         wp_editor( $value, $args['section'] . '[' . $args['id'] . ']', array( 'teeny' => false, 'textarea_rows' => 10 ) );
        echo '</div>' . PHP_EOL;

        $html = '';
        $this->append_description($html, $args);
        echo $html;
    }

    /**
     * Displays a file upload field for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_file( $args ) {
        // Enqueue JS for medias uploader
        wp_enqueue_media();
        add_action( 'admin_footer', array( __CLASS__, 'script_medias' ) );

        // Build HTML
        $value = esc_attr( $this->get_option( $args['id'], $args['section'], $args['std'] ) );
        $size  = isset( $args['size'] ) && !is_null( $args['size'] ) ? $args['size'] : 'regular';
        
        $html  = sprintf( '<input type="text" class="%1$s-text wpsf-url" id="%2$s[%3$s]" name="%2$s[%3$s]" value="%4$s"/>', $size, $args['section'], $args['id'], $value ) . PHP_EOL;
        $html .= '<input type="button" class="button wpsf-browse hide-if-no-js" value="'.__('Browse').'" />' . PHP_EOL;
        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Displays a password field for a settings field
     *
     * @param array   $args settings field args
     */
    public function callback_password( $args ) {
        $value = esc_attr( $this->get_option( $args['id'], $args['section'], $args['std'] ) );
        $size  = isset( $args['size'] ) && !is_null( $args['size'] ) ? $args['size'] : 'regular';

        $html  = sprintf( '<input type="password" class="%1$s-text" id="%2$s[%3$s]" name="%2$s[%3$s]" value="%4$s"/>', $size, $args['section'], $args['id'], $value ) . PHP_EOL;
        $this->append_description($html, $args);

        echo $html;
    }

    /**
     * Sanitize callback for Settings API
     */
    public function sanitize_options( $options ) {
        if ( empty($options) ) {
            return $options;
        }
        
        foreach( $options as $option_slug => $option_value ) {
            $sanitize_callback = $this->get_sanitize_callback( $option_slug );

            // If callback is set, call it
            if ( $sanitize_callback ) {
                $options[ $option_slug ] = call_user_func( $sanitize_callback, $option_value );
                continue;
            }

            // Treat everything that's not an array as a string
            if ( !is_array( $option_value ) ) {
                $options[ $option_slug ] = sanitize_text_field( $option_value );
                continue;
            }
        }

        return $options;
    }

    /**
     * Get sanitization callback for given option slug
     *
     * @param string $slug option slug
     *
     * @return mixed string or bool false
     */
    public function get_sanitize_callback( $slug = '' ) {
        if ( empty( $slug ) ) {
            return false;
        }

        // Iterate over registered fields and see if we can find proper callback
        foreach( $this->settings_fields as $options ) {
            foreach ( $options as $option ) {
                if ( $option['name'] != $slug ) {
                    continue;
                }

                // Return the callback name
                return isset( $option['sanitize_callback'] ) && is_callable( $option['sanitize_callback'] ) ? $option['sanitize_callback'] : false;
            }
        }

        return false;
    }

    /**
     * Get the value of a settings field
     *
     * @param string  $option  settings field name
     * @param string  $section the section name this field belongs to
     * @param string  $default default text if it's not found
     * @return string
     */
    public function get_option( $option, $section, $default = '' ) {
        $options = get_option( $section );
        if ( isset( $options[$option] ) ) {
            return $options[$option];
        }

        return $default;
    }

    /**
     * Show navigations as tab
     *
     * Shows all the settings section labels as tab
     */
    public function show_navigation() {
        $current_tab = ( isset($_GET['tab']) ) ? $_GET['tab'] : '';

        $html = '<h2 class="nav-tab-wrapper">' . PHP_EOL;
            $i = 0;
            foreach ( $this->settings_sections as $section ) {
                if ( empty($section['id']) ) {
                   continue;
                }

                $i++;

                $class = ( $current_tab == $section['id'] || ($current_tab == '' && $i == 1) ) ? 'nav-tab-active' : '';
                $title = (isset($section['tab_label']) && !empty($section['tab_label']) ) ? $section['tab_label'] : $section['title'];

                $html .= sprintf( '<a href="%1$s" class="nav-tab %2$s" id="%3$s-tab">%4$s</a>' . PHP_EOL, esc_url(add_query_arg( array('tab' => $section['id'] ) )), $class, $section['id'], $title );
            }
        $html .= '</h2>' . PHP_EOL;

        // If only one tab, hide it
        if ( $i == 1 ) {
            $html = '';
        }

        echo $html;
    }

    /**
     * Show the section settings forms
     *
     * This function displays every sections in a different form
     */
    public function show_forms() {
        $form = false;

        // Load tab specify on URL ?
        if ( isset($_GET['tab']) ) {
            foreach ( $this->settings_sections as $section ) {
                if ( $section['id'] == $_GET['tab'] ) {
                    $form = $section;
                    break;
                }
            }
            reset($this->settings_sections);
        }
        
        // No current tab ? Take first
        if ( empty($form) ) {
            foreach ( $this->settings_sections as $section ) {
                $form = $section;
                break;
            }
        }
        
        // No form to display, no valid section
        if ( empty($form) ) {
            wp_die(__('No section available'));
        }
        
        echo '<form method="post" action="options.php">' . PHP_EOL;
             echo '<div class="metabox-holder">' . PHP_EOL;
                 echo '<div class="postbox" id="postbox-first-'.$form['id'].'">' . PHP_EOL;
                    do_action( 'wsa_form_top_' . $form['id'], $form );
                    settings_fields( $form['id'] );
                    $this->do_settings_sections( $form['id'] );
                    do_action( 'wsa_form_bottom_' . $form['id'], $form );
                 echo '</div>' . PHP_EOL;
             echo '</div>' . PHP_EOL;
            submit_button();
        echo '</form>' . PHP_EOL;
        
        echo '<style type="text/css">.metabox-holder .postbox:last-child { margin-bottom:0px; }</style>' . PHP_EOL;
    }

    /**
     * Prints out all settings sections added to a particular settings page
     *
     * Part of the Settings API. Use this in a settings page callback function
     * to output all the sections and fields that were added to that $page with
     * add_settings_section() and add_settings_field()
     *
     * @global $wp_settings_sections Storage array of all settings sections added to admin pages
     * @global $wp_settings_fields Storage array of settings fields and info about their pages/sections
     * @since 2.7.0
     *
     * @param string $page The slug name of the page whos settings sections you want to output
     */
    function do_settings_sections( $page ) {
        global $wp_settings_sections, $wp_settings_fields;

        if ( ! isset( $wp_settings_sections ) || !isset( $wp_settings_sections[$page] ) )
            return;

        foreach ( (array) $wp_settings_sections[$page] as $section ) {
            if ( $section['title'] )
                echo "<h3>{$section['title']}</h3>\n";

            if ( $section['callback'] )
                call_user_func( $section['callback'], $section );

            if ( ! isset( $wp_settings_fields ) || !isset( $wp_settings_fields[$page] ) || !isset( $wp_settings_fields[$page][$section['id']] ) )
                continue;
            echo '<table class="form-table">';
            $this->do_settings_fields( $page, $section['id'] );
            echo '</table>';
        }
    }

    /**
     * Print out the settings fields for a particular settings section
     *
     * Part of the Settings API. Use this in a settings page to output
     * a specific section. Should normally be called by do_settings_sections()
     * rather than directly.
     *
     * @global $wp_settings_fields Storage array of settings fields and their pages/sections
     *
     * @since 2.7.0
     *
     * @param string $page Slug title of the admin page who's settings fields you want to show.
     * @param section $section Slug title of the settings section who's fields you want to show.
     */
    function do_settings_fields($page, $section) {
        global $wp_settings_fields;

        if ( !isset($wp_settings_fields) || !isset($wp_settings_fields[$page]) || !isset($wp_settings_fields[$page][$section]) )
            return;

        foreach ( (array) $wp_settings_fields[$page][$section] as $field ) {
            if ( isset($field['args']['callback_only']) ) {
                call_user_func($field['callback'], $field['args']);
                continue;
            }

            echo '<tr valign="top">';
                if ( !empty($field['args']['label_for']) )
                    echo '<th scope="row"><label for="' . esc_attr( $field['args']['label_for'] ) . '">' . $field['title'] . '</label></th>';
                else
                    echo '<th scope="row">' . $field['title'] . '</th>';
                echo '<td>';
                    call_user_func($field['callback'], $field['args']);
                echo '</td>';
            echo '</tr>';
        }
    }

    /**
     * Register JS action for new media uploader from WP 3.5
     * 
     */
    public static function script_medias() {
        ?>
        <script type="text/javascript">
        jQuery(document).ready(function($){
            var file_frame;
            jQuery(".form-table").on("click", "input.wpsf-browse", function (event) {
                event.preventDefault();
                current_button = jQuery(this);

                // Create the media frame.
                file_frame = wp.media.frames.file_frame = wp.media({
                    title: current_button.data("uploader_title"),
                    button: {
                        text: current_button.data("uploader_button_text"),
                    },
                    multiple: false // Set to true to allow multiple files to be selected
                });

                // When an image is selected, run a callback.
                file_frame.on("select", function () {
                    // We set multiple to false so only get one image from the uploader
                    attachment = file_frame.state().get("selection").first().toJSON();

                    // Do something with attachment.id and/or attachment.url here
                    current_button.prev('input.wpsf-url').val(attachment.url);
                });

                // Finally, open the modal
                file_frame.open();
            });
        });
        </script>
        <?php
    }
}
endif;