# feedwordpress/2020.0818/compatability.php

FeedWordPress, version 2020.0818. 257 lines.

- Page: https://pluginprobe.com/plugins/feedwordpress/2020.0818/code/compatability.php
- Raw: https://pluginprobe.com/plugins/feedwordpress/2020.0818/raw/compatability.php
- Modified: 2020-08-19T02:23:36+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/feedwordpress/2020.0818/code/compatability.php#L10-L20`.

```php
<?php
################################################################################
## LEGACY API: Replicate or mock up functions for legacy support purposes ######
################################################################################

class FeedWordPressCompatibility {

	/**
	 * FeedWordPressCompatibility::test_version: test version of WordPress
	 * based on the database schema version.
	 *
	 * @param int $floor The minimum version necessary
	 * @param mixed $ceiling The first version that is too high. If omitted
	 * 	or NULL, no version is too high.
	 * @return bool TRUE if within the range of versions, FALSE if too low
	 * 	or too high.
	 */
	static function test_version ($floor, $ceiling = null) {
		global $wp_db_version;

		$ver = (isset($wp_db_version) ? $wp_db_version : 0);
		$good = ($ver >= $floor);
		if (!is_null($ceiling)) :
			$good = ($good and ($ver < $ceiling));
		endif;
		return $good;
	} /* FeedWordPressCompatibility::test_version() */

	static function insert_link_category ($name) {
		global $wpdb;

		// WordPress 2.3+ term/taxonomy API
		$term = wp_insert_term($name, 'link_category');

		// OK: returned array('term_id' => $term_id, 'term_taxonomy_id' => $tt_id)
		if (!is_wp_error($term)) :
			$cat_id = $term['term_id'];

		// Error: term with this name already exists. Well, let's use that then.
		elseif ($term->get_error_code() == 'term_exists') :
			// Already-existing term ID is returned in data field
			$cat_id = $term->get_error_data('term_exists');

		// Error: another kind of error, harder to recover from. Return WP_Error.
		else :
			$cat_id = $term;
		endif;

		// Return newly-created category ID
		return $cat_id;
	} /* FeedWordPressCompatibility::insert_link_category () */

	static function link_category_id ($value, $key = 'cat_name') {
		global $wpdb;

		$cat_id = NULL;

		$the_term = term_exists($value, 'link_category');

		// Sometimes, in some versions, we get a row
		if (is_array($the_term)) :
			$cat_id = $the_term['term_id'];

		// other times we get an integer result
		else :
			$cat_id = $the_term;
		endif;

		return $cat_id;
	} /* FeedWordPressCompatibility::link_category_id () */

	static function validate_http_request ($action = -1, $capability = null) {
		// Only worry about this if we're using a method with significant side-effects
		if (strtoupper($_SERVER['REQUEST_METHOD']) == 'POST') :
			// Limit post by user capabilities
			if (!is_null($capability) and !current_user_can($capability)) :
				wp_die(__('Cheatin&#8217; uh?'));
			endif;

			// If check_admin_referer() checks a nonce.
			if (function_exists('wp_verify_nonce')) :
				check_admin_referer($action);

			// No nonces means no checking nonces.
			else :
				check_admin_referer();
			endif;
		endif;
	} /* FeedWordPressCompatibility::validate_http_request() */

	static function stamp_nonce ($action = -1) {
		// stamp form with hidden fields for a nonce in WP 2.0.3 & later
		if (function_exists('wp_nonce_field')) :
			wp_nonce_field($action);
		endif;
	} /* FeedWordPressCompatibility::stamp_nonce() */

	static function bottom_script_hook ($filename) {
		global $fwp_path;

		$hook = 'admin_footer-'.$fwp_path.'/'.basename($filename);
		return $hook;
	} /* FeedWordPressCompatibility::bottom_script_hook() */
} /* class FeedWordPressCompatibility */

// Compat

if (!function_exists('set_post_field')) {

	/**
	 * Update data from a post field based on Post ID
	 *
	 * Examples of the post field will be, 'post_type', 'post_status', 'post_content', etc.
	 *
	 * The context values are based off of the taxonomy filter functions and
	 * supported values are found within those functions.
	 *
	 * @uses sanitize_post_field()
	 *
	 * @param string $field Post field name
	 * @param mixed $value New value for post field
	 * @param id $post Post ID
	 * @return bool Result of UPDATE query
	 *
	 * Included under terms of GPL from WordPress Ticket #10946 <http://core.trac.wordpress.org/attachment/ticket/10946/post.php.diff>
	 */
	function set_post_field ($field, $value, $post_id) {
		global $wpdb;

		$post_id = absint($post_id);
		// sigh ... when FWP is active, I need to avoid avoid_kses_munge
		// $value = sanitize_post_field($field, $value, $post_id, 'db');
		return $wpdb->update($wpdb->posts, array($field => $value), array('ID' => $post_id));
	} /* function set_post_field () */

} /* if */

if (!function_exists('is_countable')) {

	// Copied from WordPress 5.3.2 wp-includes/compat.php pursuant to terms
	// of GPL. Provide support for is_countable() for versions of PHP < 7.3
	// and for versions of WordPress < 4.9.6. -C.J. 2020/01/24
	
	/**
	 * Polyfill for is_countable() function added in PHP 7.3.
	 * 
	 * Verify that the content of a variable is an array or an object
	 * implementing the Countable interface.
	 *
	 * @since 4.9.6
	 *
	 * @param mixed $var The value to check.
	 *
	 * @return bool True if `$var` is countable, false otherwise.
	 */
	function is_countable( $var ) {
			return ( is_array( $var )
					|| $var instanceof Countable
					|| $var instanceof SimpleXMLElement
					|| $var instanceof ResourceBundle
			);
	}

} /* if */

require_once(dirname(__FILE__).'/feedwordpress-walker-category-checklist.class.php');

function fwp_category_checklist ($post_id = 0, $descendents_and_self = 0, $selected_cats = false, $params = array()) {
	if (is_string($params)) :
		$prefix = $params;
		$taxonomy = 'category';
	elseif (is_array($params)) :
		$prefix = (isset($params['prefix']) ? $params['prefix'] : '');
		$taxonomy = (isset($params['taxonomy']) ? $params['taxonomy'] : 'category');
	endif;

	$walker = new FeedWordPress_Walker_Category_Checklist($params);
	$walker->set_prefix($prefix);
	$walker->set_taxonomy($taxonomy);
	wp_terms_checklist(/*post_id=*/ $post_id, array(
		'taxonomy' => $taxonomy,
		'descendents_and_self' => $descendents_and_self,
		'selected_cats' => $selected_cats,
		'popular_cats' => false,
		'walker' => $walker,
		'checked_ontop' => true,
	));
}

function fwp_time_elapsed ($ts) {
	if (function_exists('human_time_diff')) :
		if ($ts >= time()) :
			$ret = __(human_time_diff($ts)." from now");
		else :
			$ret = __(human_time_diff($ts)." ago");
		endif;
	else :
		$ret = strftime('%x %X', $ts);
	endif;
	return $ret;
}

################################################################################
## UPGRADE INTERFACE: Have users upgrade DB from older versions of FWP #########
################################################################################

function fwp_upgrade_page () {
	if (MyPHP::post('action')=='Upgrade') :
		$ver = get_option('feedwordpress_version');
		if (get_option('feedwordpress_version') != FEEDWORDPRESS_VERSION) :
			echo "<div class=\"wrap\">\n";
			echo "<h2>Upgrading FeedWordPress...</h2>";

			$feedwordpress = new FeedWordPress;
			$feedwordpress->upgrade_database($ver);
			echo "<p><strong>Done!</strong> Upgraded database to version ".FEEDWORDPRESS_VERSION.".</p>\n";
			echo "<form action=\"\" method=\"get\">\n";
			echo "<div class=\"submit\"><input type=\"hidden\" name=\"page\" value=\"syndication.php\" />";
			echo "<input type=\"submit\" value=\"Continue &raquo;\" /></form></div>\n";
			echo "</div>\n";
			return;
		else :
			echo "<div class=\"updated\"><p>Already at version ".FEEDWORDPRESS_VERSION."!</p></div>";
		endif;
	endif;
?>
<div class="wrap">
<h2>Upgrade FeedWordPress</h2>

<p>It appears that you have installed FeedWordPress
<?php echo FEEDWORDPRESS_VERSION; ?> as an upgrade to an existing installation of
FeedWordPress. That's no problem, but you will need to take a minute out first
to upgrade your database: some necessary changes in how the software keeps
track of posts and feeds will cause problems such as duplicate posts and broken
templates if we were to continue without the upgrade.</p>

<p>Note that most of FeedWordPress's functionality is temporarily disabled
until we have successfully completed the upgrade. Everything should begin
working as normal again once the upgrade is complete. There's extraordinarily
little chance of any damage as the result of the upgrade, but if you're paranoid
like me you may want to back up your database before you proceed.</p>

<p>This may take several minutes for a large installation.</p>

<form action="" method="post">
<?php FeedWordPressCompatibility::stamp_nonce('feedwordpress_upgrade'); ?>
<div class="submit"><input type="submit" name="action" value="Upgrade" /></div>
</form>
</div>
<?php
} // function fwp_upgrade_page ()

function remove_dummy_zero ($var) {
	return !(is_numeric($var) and ((int) $var == 0));
}


```