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Filename : admin-functions.php
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<?php
/**
 * Admin Functions
 *
 * @package     Schema
 * @subpackage  Admin Functions/Formatting
 * @copyright   Copyright (c) 2016, Hesham Zebida
 * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
 * @since       1.0
*/

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) exit;


add_action( 'schema_wp_do_after_settings_updated', 'schema_wp_after_update_settings' );
/**
 * Delete Schema KSON-LD cached data in post meta  on plugin settings update
 *
 *
 * @since  1.6.1
 */
function schema_wp_after_update_settings() {
    
	// Delete cached data in post meta
	schema_wp_json_delete_cache();
}

/**
 * Delete Schema KSON-LD cached data in post meta 
 *
 *
 * @since  1.6.1
 */
function schema_wp_json_delete_cache() {
    
	// Delete cached data in post meta
	delete_post_meta_by_key( '_schema_json' );
	delete_post_meta_by_key( '_schema_json_timestamp' );
}

/**
 * Sanitizes a string key for Schema Settings
 *
 * Keys are used as internal identifiers. Alphanumeric characters, dashes, underscores, stops, colons and slashes are allowed
 *
 * @since  1.5.9.3
 * @param  string $key String key
 * @return string Sanitized key
 */
function schema_wp_sanitize_key( $key ) {
	$raw_key = $key;
	$key = preg_replace( '/[^a-zA-Z0-9_\-\.\:\/]/', '', $key );

	/**
	 * Filter a sanitized key string.
	 *
	 * @since 2.5.8
	 * @param string $key     Sanitized key.
	 * @param string $raw_key The key prior to sanitization.
	 */
	return apply_filters( 'schema_wp_sanitize_key', $key, $raw_key );
}

/**
 * Convert an object to an associative array.
 *
 * Can handle multidimensional arrays
 *
 * @since 1.0
 *
 * @param unknown $data
 * @return array
 */
function schema_wp_object_to_array( $data ) {
	if ( is_array( $data ) || is_object( $data ) ) {
		$result = array();
		foreach ( $data as $key => $value ) {
			$result[ $key ] = schema_wp_object_to_array( $value );
		}
		return $result;
	}
	return $data;
}

/**
 * Flatten an array
 * 
 * @since 1.4.7
 * @return flat array
 */
function schema_wp_array_flatten($array) {

	$return = array();
	foreach ($array as $key => $value) {
	if (is_array($value)){ $return = array_merge($return, array_flatten($value));}
		else {$return[$key] = $value;}
	}
	
	return $return;
}

/**
* Retrieve a post given its title.
*
* @link http://wordpress.stackexchange.com/questions/11292/how-do-i-get-a-post-page-or-cpt-id-from-a-title-or-slug/11296#11296
*
* @since 1.6
*
* @uses $wpdb
*
* @param string $post_title Page title
* @param string $post_type post type ('post','page','any custom type')
* @param string $output Optional. Output type. OBJECT, ARRAY_N, or ARRAY_A.
* @return mixed
*/
function schema_wp_get_post_by_title($page_title, $post_type = 'post' , $output = OBJECT) {
    global $wpdb;
        $post = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_title = %s AND post_type= %s", $page_title, $post_type));
        if ( $post )
            return get_post($post, $output);

    return null;
}

/**
 * Recursive array search
 *
 * #link http://php.net/manual/en/function.array-search.php
 *
 * @since 1.6
 * @return Returns the key for needle if it is found in the array, FALSE otherwise. 
 */
function schema_wp_recursive_array_search( $needle, $haystack ) {
    foreach($haystack as $key=>$value) {
        $current_key=$key;
        if($needle===$value OR (is_array($value) && schema_wp_recursive_array_search($needle,$value) !== false)) {
            return $current_key;
        }
    }
    return false;
}

/**
 * Get corporate contacts types
 *
 * @since 1.0
 * @return array $corporate_contacts_types A list of the available types
 */
function schema_wp_get_corporate_contacts_types() {

	$corporate_contacts_types = array(
		'customer_support'		=> __( 'Customer Support', 'schema-wp' ),
		'technical_support'		=> __( 'Technical Support', 'schema-wp' ),
		'billing_support'		=> __( 'Billing Support', 'schema-wp' ),
		'bill_payment'			=> __( 'Bill Payment', 'schema-wp' ),
		'sales'					=> __( 'Sales', 'schema-wp' ),
		'reservations'			=> __( 'Reservations', 'schema-wp' ),
		'credit_card_support'	=> __( 'Credit Card Support', 'schema-wp' ),
		'emergency'				=> __( 'Emergency', 'schema-wp' ),
		'baggage_tracking'		=> __( 'Baggage Tracking', 'schema-wp' ),
		'roadside_assistance'	=> __( 'Roadside Assistance', 'schema-wp' ),
		'package_tracking'		=> __( 'Package Tracking', 'schema-wp' ),
	);

	return apply_filters( 'schema_wp_corporate_contacts_types', $corporate_contacts_types );
}

/**
 * Get post types
 *
 * @since 1.6.9.1
 * @return array $post_types of all registered post types 
 */
function schema_wp_get_post_types() {

	$post_types = array();
	$builtin = array();
	
	$builtin['post'] = array(
		'name' 	=> 'post',
		'label' => 'Post'
	);
	
	$builtin['page'] = array(
		'name' 	=> 'page',
		'label' => 'Page'
	);
	
	// all CPTs.
	$cpts_obj = get_post_types( array(
		'public'   => true,
		'_builtin' => false
		) , 
	'objects'); // return post types 'objects'
	
	if ( ! empty($cpts_obj) ) {
		// prepare array
		foreach ( $cpts_obj as $cpt => $info ) {
			$cpts[$cpt] = array(
				'name' 	=> $cpt,
				'label' => $info->label
			);
		}
		
		// merge Builtin types and 'important' CPTs to resulting array to use as argument.
		$post_types = array_merge( $builtin, $cpts );
	} else {
		
		$post_types = $builtin;
	}
	
	// debug
	//echo'<pre>';print_r($post_types);echo'</pre>';

	return apply_filters( 'schema_wp_post_types', $post_types );
}

/**
 * Get the current post type in the WordPress Admin
 *
 * @url https://gist.github.com/DomenicF/3ebcf7d53ce3182854716c4d8f1ab2e2
 * @since 1.6.9.6
 * @return array $post_types of all registered post types 
 */
function schema_wp_get_current_post_type() {
	global $post, $typenow, $current_screen;
	//we have a post so we can just get the post type from that
	if ( $post && $post->post_type ) {
   		return $post->post_type;
	}
	//check the global $typenow - set in admin.php
	elseif ( $typenow ) {
		return $typenow;
	}
	//check the global $current_screen object - set in sceen.php
	elseif ( $current_screen && $current_screen->post_type ) {
		return $current_screen->post_type;
	}
	//check the post_type querystring
	elseif ( isset( $_REQUEST['post_type'] ) ) {
		return sanitize_key( $_REQUEST['post_type'] );
	}
	//lastly check if post ID is in query string
	elseif ( isset( $_REQUEST['post'] ) ) {
		return get_post_type( $_REQUEST['post'] );
	}
	//we do not know the post type!
	return null;
}