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/**
 * The plugin API is located in this file, which allows for creating actions
 * and filters and hooking functions, and methods. The functions or methods will
 * then be run when the action or filter is called.
 *
 * The API callback examples reference functions, but can be methods of classes.
 * To hook methods, you&#039;ll need to pass an array one of two ways.
 *
 * Any of the syntaxes explained in the PHP documentation for the
 * {@link http://us2.php.net/manual/en/language.pseudo-types.php#language.types.callback &#039;callback&#039;}
 * type are valid.
 *
 * Also see the {@link http://codex.wordpress.org/Plugin_API Plugin API} for
 * more information and examples on how to use a lot of these functions.
 *
 * @package WordPress
 * @subpackage Plugin
 * @since 1.5.0
 */

// Initialize the filter globals.
global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;

if ( ! isset( $wp_filter ) )
	$wp_filter = array();

if ( ! isset( $wp_actions ) )
	$wp_actions = array();

if ( ! isset( $merged_filters ) )
	$merged_filters = array();

if ( ! isset( $wp_current_filter ) )
	$wp_current_filter = array();

/**
 * Hooks a function or method to a specific filter action.
 *
 * WordPress offers filter hooks to allow plugins to modify
 * various types of internal data at runtime.
 *
 * A plugin can modify data by binding a callback to a filter hook. When the filter
 * is later applied, each bound callback is run in order of priority, and given
 * the opportunity to modify a value by returning a new value.
 *
 * The following example shows how a callback function is bound to a filter hook.
 * Note that $example is passed to the callback, (maybe) modified, then returned:
 *
 * &lt;code&gt;
 * function example_callback( $example ) {
 * 	// Maybe modify $example in some way
 * 	return $example;
 * }
 * add_filter( &#039;example_filter&#039;, &#039;example_callback&#039; );
 * &lt;/code&gt;
 *
 * Since WordPress 1.5.1, bound callbacks can take as many arguments as are
 * passed as parameters in the corresponding apply_filters() call. The $accepted_args
 * parameter allows for calling functions only when the number of args match.
 *
 * &lt;strong&gt;Note:&lt;/strong&gt; the function will return true whether or not the callback
 * is valid. It is up to you to take care. This is done for optimization purposes,
 * so everything is as quick as possible.
 *
 * @global array $wp_filter      A multidimensional array of all hooks and the callbacks hooked to them.
 * @global array $merged_filters Tracks the tags that need to be merged for later. If the hook is added, it doesn&#039;t need to run through that process.
 *
 * @since 0.71
 *
 * @param string   $tag             The name of the filter to hook the $function_to_add callback to.
 * @param callback $function_to_add The callback to be run when the filter is applied.
 * @param int      $priority        (optional) The order in which the functions associated with a particular action are executed. Lower numbers correspond with earlier execution, and functions with the same priority are executed in the order in which they were added to the action.
 *                                  Default 10.
 * @param int      $accepted_args   (optional) The number of arguments the function accepts.
 *                                  Default 1.
 * @return boolean true
 */
function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1 ) {
	global $wp_filter, $merged_filters;

	$idx = _wp_filter_build_unique_id($tag, $function_to_add, $priority);
	$wp_filter[$tag][$priority][$idx] = array(&#039;function&#039; =&gt; $function_to_add, &#039;accepted_args&#039; =&gt; $accepted_args);
	unset( $merged_filters[ $tag ] );
	return true;
}

/**
 * Check if any filter has been registered for a hook.
 *
 * @since 2.5.0
 *
 * @global array $wp_filter Stores all of the filters
 *
 * @param string $tag The name of the filter hook.
 * @param callback $function_to_check optional.
 * @return mixed If $function_to_check is omitted, returns boolean for whether the hook has anything registered.
 * 	When checking a specific function, the priority of that hook is returned, or false if the function is not attached.
 * 	When using the $function_to_check argument, this function may return a non-boolean value that evaluates to false
 * 	(e.g.) 0, so use the === operator for testing the return value.
 */
function has_filter($tag, $function_to_check = false) {
	global $wp_filter;

	$has = !empty($wp_filter[$tag]);
	if ( false === $function_to_check || false == $has )
		return $has;

	if ( !$idx = _wp_filter_build_unique_id($tag, $function_to_check, false) )
		return false;

	foreach ( (array) array_keys($wp_filter[$tag]) as $priority ) {
		if ( isset($wp_filter[$tag][$priority][$idx]) )
			return $priority;
	}

	return false;
}

/**
 * Call the functions added to a filter hook.
 *
 * The callback functions attached to filter hook $tag are invoked by calling
 * this function. This function can be used to create a new filter hook by
 * simply calling this function with the name of the new hook specified using
 * the $tag parameter.
 *
 * The function allows for additional arguments to be added and passed to hooks.
 * &lt;code&gt;
 * // Our filter callback function
 * function example_callback( $string, $arg1, $arg2 ) {
 *	// (maybe) modify $string
 *	return $string;
 * }
 * add_filter( &#039;example_filter&#039;, &#039;example_callback&#039;, 10, 3 );
 *
 * // Apply the filters by calling the &#039;example_callback&#039; function we
 * // &quot;hooked&quot; to &#039;example_filter&#039; using the add_filter() function above.
 * // - &#039;example_filter&#039; is the filter hook $tag
 * // - &#039;filter me&#039; is the value being filtered
 * // - $arg1 and $arg2 are the additional arguments passed to the callback.
 * $value = apply_filters( &#039;example_filter&#039;, &#039;filter me&#039;, $arg1, $arg2 );
 * &lt;/code&gt;
 *
 * @global array $wp_filter         Stores all of the filters
 * @global array $merged_filters    Merges the filter hooks using this function.
 * @global array $wp_current_filter stores the list of current filters with the current one last
 *
 * @since 0.71
 *
 * @param string $tag  The name of the filter hook.
 * @param mixed $value The value on which the filters hooked to &lt;tt&gt;$tag&lt;/tt&gt; are applied on.
 * @param mixed $var   Additional variables passed to the functions hooked to &lt;tt&gt;$tag&lt;/tt&gt;.
 * @return mixed The filtered value after all hooked functions are applied to it.
 */
function apply_filters( $tag, $value ) {
	global $wp_filter, $merged_filters, $wp_current_filter;

	$args = array();

	// Do &#039;all&#039; actions first
	if ( isset($wp_filter[&#039;all&#039;]) ) {
		$wp_current_filter[] = $tag;
		$args = func_get_args();
		_wp_call_all_hook($args);
	}

	if ( !isset($wp_filter[$tag]) ) {
		if ( isset($wp_filter[&#039;all&#039;]) )
			array_pop($wp_current_filter);
		return $value;
	}

	if ( !isset($wp_filter[&#039;all&#039;]) )
		$wp_current_filter[] = $tag;

	// Sort
	if ( !isset( $merged_filters[ $tag ] ) ) {
		ksort($wp_filter[$tag]);
		$merged_filters[ $tag ] = true;
	}

	reset( $wp_filter[ $tag ] );

	if ( empty($args) )
		$args = func_get_args();

	do {
		foreach( (array) current($wp_filter[$tag]) as $the_ )
			if ( !is_null($the_[&#039;function&#039;]) ){
				$args[1] = $value;
				$value = call_user_func_array($the_[&#039;function&#039;], array_slice($args, 1, (int) $the_[&#039;accepted_args&#039;]));
			}

	} while ( next($wp_filter[$tag]) !== false );

	array_pop( $wp_current_filter );

	return $value;
}

/**
 * Execute functions hooked on a specific filter hook, specifying arguments in an array.
 *
 * @see apply_filters() This function is identical, but the arguments passed to the
 * functions hooked to &lt;tt&gt;$tag&lt;/tt&gt; are supplied using an array.
 *
 * @since 3.0.0
 * @global array $wp_filter Stores all of the filters
 * @global array $merged_filters Merges the filter hooks using this function.
 * @global array $wp_current_filter stores the list of current filters with the current one last
 *
 * @param string $tag The name of the filter hook.
 * @param array $args The arguments supplied to the functions hooked to &lt;tt&gt;$tag&lt;/tt&gt;
 * @return mixed The filtered value after all hooked functions are applied to it.
 */
function apply_filters_ref_array($tag, $args) {
	global $wp_filter, $merged_filters, $wp_current_filter;

	// Do &#039;all&#039; actions first
	if ( isset($wp_filter[&#039;all&#039;]) ) {
		$wp_current_filter[] = $tag;
		$all_args = func_get_args();
		_wp_call_all_hook($all_args);
	}

	if ( !isset($wp_filter[$tag]) ) {
		if ( isset($wp_filter[&#039;all&#039;]) )
			array_pop($wp_current_filter);
		return $args[0];
	}

	if ( !isset($wp_filter[&#039;all&#039;]) )
		$wp_current_filter[] = $tag;

	// Sort
	if ( !isset( $merged_filters[ $tag ] ) ) {
		ksort($wp_filter[$tag]);
		$merged_filters[ $tag ] = true;
	}

	reset( $wp_filter[ $tag ] );

	do {
		foreach( (array) current($wp_filter[$tag]) as $the_ )
			if ( !is_null($the_[&#039;function&#039;]) )
				$args[0] = call_user_func_array($the_[&#039;function&#039;], array_slice($args, 0, (int) $the_[&#039;accepted_args&#039;]));

	} while ( next($wp_filter[$tag]) !== false );

	array_pop( $wp_current_filter );

	return $args[0];
}

/**
 * Removes a function from a specified filter hook.
 *
 * This function removes a function attached to a specified filter hook. This
 * method can be used to remove default functions attached to a specific filter
 * hook and possibly replace them with a substitute.
 *
 * To remove a hook, the $function_to_remove and $priority arguments must match
 * when the hook was added. This goes for both filters and actions. No warning
 * will be given on removal failure.
 *
 * @since 1.2.0
 *
 * @param string $tag The filter hook to which the function to be removed is hooked.
 * @param callback $function_to_remove The name of the function which should be removed.
 * @param int $priority optional. The priority of the function (default: 10).
 * @param int $accepted_args optional. The number of arguments the function accepts (default: 1).
 * @return boolean Whether the function existed before it was removed.
 */
function remove_filter( $tag, $function_to_remove, $priority = 10 ) {
	$function_to_remove = _wp_filter_build_unique_id($tag, $function_to_remove, $priority);

	$r = isset($GLOBALS[&#039;wp_filter&#039;][$tag][$priority][$function_to_remove]);

	if ( true === $r) {
		unset($GLOBALS[&#039;wp_filter&#039;][$tag][$priority][$function_to_remove]);
		if ( empty($GLOBALS[&#039;wp_filter&#039;][$tag][$priority]) )
			unset($GLOBALS[&#039;wp_filter&#039;][$tag][$priority]);
		unset($GLOBALS[&#039;merged_filters&#039;][$tag]);
	}

	return $r;
}

/**
 * Remove all of the hooks from a filter.
 *
 * @since 2.7.0
 *
 * @param string $tag The filter to remove hooks from.
 * @param int $priority The priority number to remove.
 * @return bool True when finished.
 */
function remove_all_filters($tag, $priority = false) {
	global $wp_filter, $merged_filters;

	if( isset($wp_filter[$tag]) ) {
		if( false !== $priority &amp;&amp; isset($wp_filter[$tag][$priority]) )
			unset($wp_filter[$tag][$priority]);
		else
			unset($wp_filter[$tag]);
	}

	if( isset($merged_filters[$tag]) )
		unset($merged_filters[$tag]);

	return true;
}

/**
 * Retrieve the name of the current filter or action.
 *
 * @since 2.5.0
 *
 * @return string Hook name of the current filter or action.
 */
function current_filter() {
	global $wp_current_filter;
	return end( $wp_current_filter );
}

/**
 * Retrieve the name of the current action.
 *
 * @since 3.9.0
 *
 * @uses current_filter()
 *
 * @return string Hook name of the current action.
 */
function current_action() {
	return current_filter();
}

/**
 * Retrieve the name of a filter currently being processed.
 *
 * The function current_filter() only returns the most recent filter or action
 * being executed. did_action() returns true once the action is initially
 * processed. This function allows detection for any filter currently being
 * executed (despite not being the most recent filter to fire, in the case of
 * hooks called from hook callbacks) to be verified.
 *
 * @since 3.9.0
 *
 * @see current_filter()
 * @see did_action()
 * @global array $wp_current_filter Current filter.
 *
 * @param null|string $filter Optional. Filter to check. Defaults to null, which
 *                            checks if any filter is currently being run.
 * @return bool Whether the filter is currently in the stack
 */
function doing_filter( $filter = null ) {
	global $wp_current_filter;

	if ( null === $filter ) {
		return ! empty( $wp_current_filter );
	}

	return in_array( $filter, $wp_current_filter );
}

/**
 * Retrieve the name of an action currently being processed.
 *
 * @since 3.9.0
 *
 * @uses doing_filter()
 *
 * @param string|null $action Optional. Action to check. Defaults to null, which checks
 *                            if any action is currently being run.
 * @return bool Whether the action is currently in the stack.
 */
function doing_action( $action = null ) {
	return doing_filter( $action );
}

/**
 * Hooks a function on to a specific action.
 *
 * Actions are the hooks that the WordPress core launches at specific points
 * during execution, or when specific events occur. Plugins can specify that
 * one or more of its PHP functions are executed at these points, using the
 * Action API.
 *
 * @uses add_filter() Adds an action. Parameter list and functionality are the same.
 *
 * @since 1.2.0
 *
 * @param string $tag The name of the action to which the $function_to_add is hooked.
 * @param callback $function_to_add The name of the function you wish to be called.
 * @param int $priority optional. Used to specify the order in which the functions associated with a particular action are executed (default: 10). Lower numbers correspond with earlier execution, and functions with the same priority are executed in the order in which they were added to the action.
 * @param int $accepted_args optional. The number of arguments the function accept (default 1).
 */
function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
	return add_filter($tag, $function_to_add, $priority, $accepted_args);
}

/**
 * Execute functions hooked on a specific action hook.
 *
 * This function invokes all functions attached to action hook $tag. It is
 * possible to create new action hooks by simply calling this function,
 * specifying the name of the new hook using the &lt;tt&gt;$tag&lt;/tt&gt; parameter.
 *
 * You can pass extra arguments to the hooks, much like you can with
 * apply_filters().
 *
 * @see apply_filters() This function works similar with the exception that
 * nothing is returned and only the functions or methods are called.
 *
 * @since 1.2.0
 *
 * @global array $wp_filter Stores all of the filters
 * @global array $wp_actions Increments the amount of times action was triggered.
 *
 * @param string $tag The name of the action to be executed.
 * @param mixed $arg,... Optional additional arguments which are passed on to the functions hooked to the action.
 * @return null Will return null if $tag does not exist in $wp_filter array
 */
function do_action($tag, $arg = &#039;&#039;) {
	global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;

	if ( ! isset($wp_actions[$tag]) )
		$wp_actions[$tag] = 1;
	else
		++$wp_actions[$tag];

	// Do &#039;all&#039; actions first
	if ( isset($wp_filter[&#039;all&#039;]) ) {
		$wp_current_filter[] = $tag;
		$all_args = func_get_args();
		_wp_call_all_hook($all_args);
	}

	if ( !isset($wp_filter[$tag]) ) {
		if ( isset($wp_filter[&#039;all&#039;]) )
			array_pop($wp_current_filter);
		return;
	}

	if ( !isset($wp_filter[&#039;all&#039;]) )
		$wp_current_filter[] = $tag;

	$args = array();
	if ( is_array($arg) &amp;&amp; 1 == count($arg) &amp;&amp; isset($arg[0]) &amp;&amp; is_object($arg[0]) ) // array(&amp;$this)
		$args[] =&amp; $arg[0];
	else
		$args[] = $arg;
	for ( $a = 2; $a &lt; func_num_args(); $a++ )
		$args[] = func_get_arg($a);

	// Sort
	if ( !isset( $merged_filters[ $tag ] ) ) {
		ksort($wp_filter[$tag]);
		$merged_filters[ $tag ] = true;
	}

	reset( $wp_filter[ $tag ] );

	do {
		foreach ( (array) current($wp_filter[$tag]) as $the_ )
			if ( !is_null($the_[&#039;function&#039;]) )
				call_user_func_array($the_[&#039;function&#039;], array_slice($args, 0, (int) $the_[&#039;accepted_args&#039;]));

	} while ( next($wp_filter[$tag]) !== false );

	array_pop($wp_current_filter);
}

/**
 * Retrieve the number of times an action is fired.
 *
 * @since 2.1.0
 *
 * @global array $wp_actions Increments the amount of times action was triggered.
 *
 * @param string $tag The name of the action hook.
 * @return int The number of times action hook &lt;tt&gt;$tag&lt;/tt&gt; is fired
 */
function did_action($tag) {
	global $wp_actions;

	if ( ! isset( $wp_actions[ $tag ] ) )
		return 0;

	return $wp_actions[$tag];
}

/**
 * Execute functions hooked on a specific action hook, specifying arguments in an array.
 *
 * @see do_action() This function is identical, but the arguments passed to the
 * functions hooked to &lt;tt&gt;$tag&lt;/tt&gt; are supplied using an array.
 *
 * @since 2.1.0
 *
 * @global array $wp_filter Stores all of the filters
 * @global array $wp_actions Increments the amount of times action was triggered.
 *
 * @param string $tag The name of the action to be executed.
 * @param array $args The arguments supplied to the functions hooked to &lt;tt&gt;$tag&lt;/tt&gt;
 * @return null Will return null if $tag does not exist in $wp_filter array
 */
function do_action_ref_array($tag, $args) {
	global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;

	if ( ! isset($wp_actions[$tag]) )
		$wp_actions[$tag] = 1;
	else
		++$wp_actions[$tag];

	// Do &#039;all&#039; actions first
	if ( isset($wp_filter[&#039;all&#039;]) ) {
		$wp_current_filter[] = $tag;
		$all_args = func_get_args();
		_wp_call_all_hook($all_args);
	}

	if ( !isset($wp_filter[$tag]) ) {
		if ( isset($wp_filter[&#039;all&#039;]) )
			array_pop($wp_current_filter);
		return;
	}

	if ( !isset($wp_filter[&#039;all&#039;]) )
		$wp_current_filter[] = $tag;

	// Sort
	if ( !isset( $merged_filters[ $tag ] ) ) {
		ksort($wp_filter[$tag]);
		$merged_filters[ $tag ] = true;
	}

	reset( $wp_filter[ $tag ] );

	do {
		foreach( (array) current($wp_filter[$tag]) as $the_ )
			if ( !is_null($the_[&#039;function&#039;]) )
				call_user_func_array($the_[&#039;function&#039;], array_slice($args, 0, (int) $the_[&#039;accepted_args&#039;]));

	} while ( next($wp_filter[$tag]) !== false );

	array_pop($wp_current_filter);
}

/**
 * Check if any action has been registered for a hook.
 *
 * @since 2.5.0
 *
 * @see has_filter() has_action() is an alias of has_filter().
 *
 * @param string $tag The name of the action hook.
 * @param callback $function_to_check optional.
 * @return mixed If $function_to_check is omitted, returns boolean for whether the hook has anything registered.
 * 	When checking a specific function, the priority of that hook is returned, or false if the function is not attached.
 * 	When using the $function_to_check argument, this function may return a non-boolean value that evaluates to false
 * 	(e.g.) 0, so use the === operator for testing the return value.
 */
function has_action($tag, $function_to_check = false) {
	return has_filter($tag, $function_to_check);
}

/**
 * Removes a function from a specified action hook.
 *
 * This function removes a function attached to a specified action hook. This
 * method can be used to remove default functions attached to a specific filter
 * hook and possibly replace them with a substitute.
 *
 * @since 1.2.0
 *
 * @param string $tag The action hook to which the function to be removed is hooked.
 * @param callback $function_to_remove The name of the function which should be removed.
 * @param int $priority optional The priority of the function (default: 10).
 * @return boolean Whether the function is removed.
 */
function remove_action( $tag, $function_to_remove, $priority = 10 ) {
	return remove_filter( $tag, $function_to_remove, $priority );
}

/**
 * Remove all of the hooks from an action.
 *
 * @since 2.7.0
 *
 * @param string $tag The action to remove hooks from.
 * @param int $priority The priority number to remove them from.
 * @return bool True when finished.
 */
function remove_all_actions($tag, $priority = false) {
	return remove_all_filters($tag, $priority);
}

//
// Functions for handling plugins.
//

/**
 * Gets the basename of a plugin.
 *
 * This method extracts the name of a plugin from its filename.
 *
 * @since 1.5.0
 *
 * @access private
 *
 * @param string $file The filename of plugin.
 * @return string The name of a plugin.
 * @uses WP_PLUGIN_DIR
 */
function plugin_basename( $file ) {
	global $wp_plugin_paths;

	foreach ( $wp_plugin_paths as $dir =&gt; $realdir ) {
		if ( strpos( $file, $realdir ) === 0 ) {
			$file = $dir . substr( $file, strlen( $realdir ) );
		}
	}

	$file = wp_normalize_path( $file );
	$plugin_dir = wp_normalize_path( WP_PLUGIN_DIR );
	$mu_plugin_dir = wp_normalize_path( WPMU_PLUGIN_DIR );

	$file = preg_replace(&#039;#^&#039; . preg_quote($plugin_dir, &#039;#&#039;) . &#039;/|^&#039; . preg_quote($mu_plugin_dir, &#039;#&#039;) . &#039;/#&#039;,&#039;&#039;,$file); // get relative path from plugins dir
	$file = trim($file, &#039;/&#039;);
	return $file;
}

/**
 * Register a plugin&#039;s real path.
 *
 * This is used in plugin_basename() to resolve symlinked paths.
 *
 * @since 3.9.0
 *
 * @see plugin_basename()
 *
 * @param string $file Known path to the file.
 * @return bool Whether the path was able to be registered.
 */
function wp_register_plugin_realpath( $file ) {
	global $wp_plugin_paths;

	// Normalize, but store as static to avoid recalculation of a constant value
	static $wp_plugin_path, $wpmu_plugin_path;
	if ( ! isset( $wp_plugin_path ) ) {
		$wp_plugin_path   = wp_normalize_path( WP_PLUGIN_DIR   );
		$wpmu_plugin_path = wp_normalize_path( WPMU_PLUGIN_DIR );
	}

	$plugin_path = wp_normalize_path( dirname( $file ) );
	$plugin_realpath = wp_normalize_path( dirname( realpath( $file ) ) );

	if ( $plugin_path === $wp_plugin_path || $plugin_path === $wpmu_plugin_path ) {
		return false;
	}

	if ( $plugin_path !== $plugin_realpath ) {
		$wp_plugin_paths[ $plugin_path ] = $plugin_realpath;
	}

	return true;
}

/**
 * Gets the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in
 *
 * @since 2.8.0
 *
 * @param string $file The filename of the plugin (__FILE__)
 * @return string the filesystem path of the directory that contains the plugin
 */
function plugin_dir_path( $file ) {
	return trailingslashit( dirname( $file ) );
}

/**
 * Gets the URL directory path (with trailing slash) for the plugin __FILE__ passed in
 *
 * @since 2.8.0
 *
 * @param string $file The filename of the plugin (__FILE__)
 * @return string the URL path of the directory that contains the plugin
 */
function plugin_dir_url( $file ) {
	return trailingslashit( plugins_url( &#039;&#039;, $file ) );
}

/**
 * Set the activation hook for a plugin.
 *
 * When a plugin is activated, the action &#039;activate_PLUGINNAME&#039; hook is
 * called. In the name of this hook, PLUGINNAME is replaced with the name
 * of the plugin, including the optional subdirectory. For example, when the
 * plugin is located in wp-content/plugins/sampleplugin/sample.php, then
 * the name of this hook will become &#039;activate_sampleplugin/sample.php&#039;.
 *
 * When the plugin consists of only one file and is (as by default) located at
 * wp-content/plugins/sample.php the name of this hook will be
 * &#039;activate_sample.php&#039;.
 *
 * @since 2.0.0
 *
 * @param string $file The filename of the plugin including the path.
 * @param callback $function the function hooked to the &#039;activate_PLUGIN&#039; action.
 */
function register_activation_hook($file, $function) {
	$file = plugin_basename($file);
	add_action(&#039;activate_&#039; . $file, $function);
}

/**
 * Set the deactivation hook for a plugin.
 *
 * When a plugin is deactivated, the action &#039;deactivate_PLUGINNAME&#039; hook is
 * called. In the name of this hook, PLUGINNAME is replaced with the name
 * of the plugin, including the optional subdirectory. For example, when the
 * plugin is located in wp-content/plugins/sampleplugin/sample.php, then
 * the name of this hook will become &#039;deactivate_sampleplugin/sample.php&#039;.
 *
 * When the plugin consists of only one file and is (as by default) located at
 * wp-content/plugins/sample.php the name of this hook will be
 * &#039;deactivate_sample.php&#039;.
 *
 * @since 2.0.0
 *
 * @param string $file The filename of the plugin including the path.
 * @param callback $function the function hooked to the &#039;deactivate_PLUGIN&#039; action.
 */
function register_deactivation_hook($file, $function) {
	$file = plugin_basename($file);
	add_action(&#039;deactivate_&#039; . $file, $function);
}

/**
 * Set the uninstallation hook for a plugin.
 *
 * Registers the uninstall hook that will be called when the user clicks on the
 * uninstall link that calls for the plugin to uninstall itself. The link won&#039;t
 * be active unless the plugin hooks into the action.
 *
 * The plugin should not run arbitrary code outside of functions, when
 * registering the uninstall hook. In order to run using the hook, the plugin
 * will have to be included, which means that any code laying outside of a
 * function will be run during the uninstall process. The plugin should not
 * hinder the uninstall process.
 *
 * If the plugin can not be written without running code within the plugin, then
 * the plugin should create a file named &#039;uninstall.php&#039; in the base plugin
 * folder. This file will be called, if it exists, during the uninstall process
 * bypassing the uninstall hook. The plugin, when using the &#039;uninstall.php&#039;
 * should always check for the &#039;WP_UNINSTALL_PLUGIN&#039; constant, before
 * executing.
 *
 * @since 2.7.0
 *
 * @param string $file
 * @param callback $callback The callback to run when the hook is called. Must be a static method or function.
 */
function register_uninstall_hook( $file, $callback ) {
	if ( is_array( $callback ) &amp;&amp; is_object( $callback[0] ) ) {
		_doing_it_wrong( __FUNCTION__, __( &#039;Only a static class method or function can be used in an uninstall hook.&#039; ), &#039;3.1&#039; );
		return;
	}

	// The option should not be autoloaded, because it is not needed in most
	// cases. Emphasis should be put on using the &#039;uninstall.php&#039; way of
	// uninstalling the plugin.
	$uninstallable_plugins = (array) get_option(&#039;uninstall_plugins&#039;);
	$uninstallable_plugins[plugin_basename($file)] = $callback;
	update_option(&#039;uninstall_plugins&#039;, $uninstallable_plugins);
}

/**
 * Calls the &#039;all&#039; hook, which will process the functions hooked into it.
 *
 * The &#039;all&#039; hook passes all of the arguments or parameters that were used for
 * the hook, which this function was called for.
 *
 * This function is used internally for apply_filters(), do_action(), and
 * do_action_ref_array() and is not meant to be used from outside those
 * functions. This function does not check for the existence of the all hook, so
 * it will fail unless the all hook exists prior to this function call.
 *
 * @since 2.5.0
 * @access private
 *
 * @uses $wp_filter Used to process all of the functions in the &#039;all&#039; hook
 *
 * @param array $args The collected parameters from the hook that was called.
 */
function _wp_call_all_hook($args) {
	global $wp_filter;

	reset( $wp_filter[&#039;all&#039;] );
	do {
		foreach( (array) current($wp_filter[&#039;all&#039;]) as $the_ )
			if ( !is_null($the_[&#039;function&#039;]) )
				call_user_func_array($the_[&#039;function&#039;], $args);

	} while ( next($wp_filter[&#039;all&#039;]) !== false );
}

/**
 * Build Unique ID for storage and retrieval.
 *
 * The old way to serialize the callback caused issues and this function is the
 * solution. It works by checking for objects and creating an a new property in
 * the class to keep track of the object and new objects of the same class that
 * need to be added.
 *
 * It also allows for the removal of actions and filters for objects after they
 * change class properties. It is possible to include the property $wp_filter_id
 * in your class and set it to &quot;null&quot; or a number to bypass the workaround.
 * However this will prevent you from adding new classes and any new classes
 * will overwrite the previous hook by the same class.
 *
 * Functions and static method callbacks are just returned as strings and
 * shouldn&#039;t have any speed penalty.
 *
 * @access private
 * @since 2.2.3
 * @link http://trac.wordpress.org/ticket/3875
 *
 * @global array $wp_filter Storage for all of the filters and actions
 * @param string $tag Used in counting how many hooks were applied
 * @param callback $function Used for creating unique id
 * @param int|bool $priority Used in counting how many hooks were applied. If === false and $function is an object reference, we return the unique id only if it already has one, false otherwise.
 * @return string|bool Unique ID for usage as array key or false if $priority === false and $function is an object reference, and it does not already have a unique id.
 */
function _wp_filter_build_unique_id($tag, $function, $priority) {
	global $wp_filter;
	static $filter_id_count = 0;

	if ( is_string($function) )
		return $function;

	if ( is_object($function) ) {
		// Closures are currently implemented as objects
		$function = array( $function, &#039;&#039; );
	} else {
		$function = (array) $function;
	}

	if (is_object($function[0]) ) {
		// Object Class Calling
		if ( function_exists(&#039;spl_object_hash&#039;) ) {
			return spl_object_hash($function[0]) . $function[1];
		} else {
			$obj_idx = get_class($function[0]).$function[1];
			if ( !isset($function[0]-&gt;wp_filter_id) ) {
				if ( false === $priority )
					return false;
				$obj_idx .= isset($wp_filter[$tag][$priority]) ? count((array)$wp_filter[$tag][$priority]) : $filter_id_count;
				$function[0]-&gt;wp_filter_id = $filter_id_count;
				++$filter_id_count;
			} else {
				$obj_idx .= $function[0]-&gt;wp_filter_id;
			}

			return $obj_idx;
		}
	} else if ( is_string($function[0]) ) {
		// Static Calling
		return $function[0] . &#039;::&#039; . $function[1];
	}
}
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