How can i make this php class static - php

Question

I'm using this class to use wordpress like hooks and filters in my user management system, I use a autoload class to load all my classes, however it won't recognise this class unless its static, how can i make this class static ?
<?php
class Hooks
{
/**
* $filters holds list of hooks
* #access public
* #since 0.1
* #var array
*/
protected static $filters = [];
/**
* $merged_filters
* #var array
*/
protected static $merged_filters = [];
/**
* $actions
* #var array
*/
protected static $actions = [];
/**
* $current_filter holds the name of the current filter
* #access public
* #since 0.1
* #var array
*/
protected static $current_filter = [];
// Disable object instantiation
private function __construct() {}
/**
* gets instance of this class
* #access public
* #since 0.1
public static function getInstance()
{
if (self::$_instance === null) {
self::$_instance = new Hooks();
}
return self::$_instance;
}
*/
/**
* FILTERS
*/
/**
* add_filter Hooks a function or method to a specific filter action.
* #access public
* #since 0.1
* #param string $tag The name of the filter to hook the $function_to_add to.
* #param callback $function_to_add The name of the function to be called when the filter is applied.
* #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 $accepted_args optional. The number of arguments the function accept (default 1).
* #return boolean true
*/
public static function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
$idx = self::_filter_build_unique_id($tag, $function_to_add, $priority);
self::$filters[$tag][$priority][$idx] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
unset( self::$merged_filters[ $tag ] );
return true;
}
/**
* remove_filter Removes a function from a specified filter hook.
* #access public
* #since 0.1
* #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.
*/
public static function remove_filter( $tag, $function_to_remove, $priority = 10 ) {
$function_to_remove = self::_filter_build_unique_id($tag, $function_to_remove, $priority);
$r = isset(self::filters[$tag][$priority][$function_to_remove]);
if ( true === $r) {
unset(self::$filters[$tag][$priority][$function_to_remove]);
if ( empty(self::$filters[$tag][$priority]) )
unset(self::$filters[$tag][$priority]);
unset(self::$merged_filters[$tag]);
}
return $r;
}
/**
* remove_all_filters Remove all of the hooks from a filter.
* #access public
* #since 0.1
* #param string $tag The filter to remove hooks from.
* #param int $priority The priority number to remove.
* #return bool True when finished.
*/
public static function remove_all_filters($tag, $priority = false) {
if( isset(self::$filters[$tag]) ) {
if( false !== $priority && isset(self::$filters[$tag][$priority]) )
unset(self::$filters[$tag][$priority]);
else
unset(self::$filters[$tag]);
}
if( isset(self::$merged_filters[$tag]) )
unset(self::$merged_filters[$tag]);
return true;
}
/**
* has_filter Check if any filter has been registered for a hook.
* #access public
* #since 0.1
* #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 $function_to_check argument, this function may return a non-boolean value that evaluates to false
* (e.g.) 0, so use the === operator for testing the return value.
*/
public static function has_filter($tag, $function_to_check = false) {
$has = !empty(self::$filters[$tag]);
if ( false === $function_to_check || false == $has )
return $has;
if ( !$idx = self::_filter_build_unique_id($tag, $function_to_check, false) )
return false;
foreach ( (array) array_keys(self::$filters[$tag]) as $priority ) {
if ( isset(self::$filters[$tag][$priority][$idx]) )
return $priority;
}
return false;
}
/**
* apply_filters Call the functions added to a filter hook.
* #access public
* #since 0.1
* #param string $tag The name of the filter hook.
* #param mixed $value The value on which the filters hooked to <tt>$tag</tt> are applied on.
* #param mixed $var,... Additional variables passed to the functions hooked to <tt>$tag</tt>.
* #return mixed The filtered value after all hooked functions are applied to it.
*/
public static function apply_filters($tag, $value) {
$args = array();
// Do 'all' actions first
if ( isset(self::$filters['all']) ) {
self::$current_filter[] = $tag;
$args = func_get_args();
self::_call_all_hook($args);
}
if ( !isset(self::$filters[$tag]) ) {
if ( isset(self::$filters['all']) )
array_pop(self::$current_filter);
return $value;
}
if ( !isset(self::$filters['all']) )
self::$current_filter[] = $tag;
// Sort
if ( !isset( self::$merged_filters[ $tag ] ) ) {
ksort(self::$filters[$tag]);
self::$merged_filters[ $tag ] = true;
}
reset( self::$filters[ $tag ] );
if ( empty($args) )
$args = func_get_args();
do {
foreach( (array) current(self::$filters[$tag]) as $the_ )
if ( !is_null($the_['function']) ){
$args[1] = $value;
$value = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
}
} while ( next(self::$filters[$tag]) !== false );
array_pop( self::$current_filter );
return $value;
}
/**
* apply_filters_ref_array Execute functions hooked on a specific filter hook, specifying arguments in an array.
* #access public
* #since 0.1
* #param string $tag The name of the filter hook.
* #param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
* #return mixed The filtered value after all hooked functions are applied to it.
*/
public static function apply_filters_ref_array($tag, $args) {
// Do 'all' actions first
if ( isset(self::$filters['all']) ) {
self::$current_filter[] = $tag;
$all_args = func_get_args();
self::_call_all_hook($all_args);
}
if ( !isset(self::$filters[$tag]) ) {
if ( isset(self::$filters['all']) )
array_pop(self::$current_filter);
return $args[0];
}
if ( !isset(self::$filters['all']) )
self::$current_filter[] = $tag;
// Sort
if ( !isset( self::$merged_filters[ $tag ] ) ) {
ksort(self::$filters[$tag]);
self::$merged_filters[ $tag ] = true;
}
reset( self::$filters[ $tag ] );
do {
foreach( (array) current(self::$filters[$tag]) as $the_ )
if ( !is_null($the_['function']) )
$args[0] = call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
} while ( next(self::$filters[$tag]) !== false );
array_pop( self::$current_filter );
return $args[0];
}
/**
* ACTIONS
*/
/**
* add_action Hooks a function on to a specific action.
* #access public
* #since 0.1
* #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 $accepted_args optional. The number of arguments the function accept (default 1).
*/
public static function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
return self::add_filter($tag, $function_to_add, $priority, $accepted_args);
}
/**
* has_action Check if any action has been registered for a hook.
* #access public
* #since 0.1
* #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 $function_to_check argument, this function may return a non-boolean value that evaluates to false
* (e.g.) 0, so use the === operator for testing the return value.
*/
public static function has_action($tag, $function_to_check = false) {
return self::has_filter($tag, $function_to_check);
}
/**
* remove_action Removes a function from a specified action hook.
* #access public
* #since 0.1
* #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.
*/
public static function remove_action( $tag, $function_to_remove, $priority = 10 ) {
return self::remove_filter( $tag, $function_to_remove, $priority );
}
/**
* remove_all_actions Remove all of the hooks from an action.
* #access public
* #since 0.1
* #param string $tag The action to remove hooks from.
* #param int $priority The priority number to remove them from.
* #return bool True when finished.
*/
public static function remove_all_actions($tag, $priority = false) {
return self::remove_all_filters($tag, $priority);
}
/**
* do_action Execute functions hooked on a specific action hook.
* #access public
* #since 0.1
* #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 $filter array
*/
public static function do_action($tag, $arg = '') {
if ( ! isset(self::$actions) )
self::$actions = array();
if ( ! isset(self::$actions[$tag]) )
self::$actions[$tag] = 1;
else
++self::$actions[$tag];
// Do 'all' actions first
if ( isset(self::$filters['all']) ) {
self::$current_filter[] = $tag;
$all_args = func_get_args();
self::_call_all_hook($all_args);
}
if ( !isset(self::$filters[$tag]) ) {
if ( isset(self::$filters['all']) )
array_pop(self::$current_filter);
return;
}
if ( !isset(self::$filters['all']) )
self::$current_filter[] = $tag;
$args = array();
if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this)
$args[] =& $arg[0];
else
$args[] = $arg;
for ( $a = 2; $a < func_num_args(); $a++ )
$args[] = func_get_arg($a);
// Sort
if ( !isset( self::$merged_filters[ $tag ] ) ) {
ksort(self::$filters[$tag]);
self::$merged_filters[ $tag ] = true;
}
reset( self::$filters[ $tag ] );
do {
foreach ( (array) current(self::$filters[$tag]) as $the_ )
if ( !is_null($the_['function']) )
call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
} while ( next(self::$filters[$tag]) !== false );
array_pop(self::$current_filter);
}
/**
* do_action_ref_array Execute functions hooked on a specific action hook, specifying arguments in an array.
* #access public
* #since 0.1
* #param string $tag The name of the action to be executed.
* #param array $args The arguments supplied to the functions hooked to <tt>$tag</tt>
* #return null Will return null if $tag does not exist in $filter array
*/
public static function do_action_ref_array($tag, $args) {
if ( ! isset(self::$actions) )
self::$actions = [];
if ( ! isset(self::$actions[$tag]) )
self::$actions[$tag] = 1;
else
++self::$actions[$tag];
// Do 'all' actions first
if ( isset(self::$filters['all']) ) {
self::$current_filter[] = $tag;
$all_args = func_get_args();
self::_call_all_hook($all_args);
}
if ( !isset(self::$filters[$tag]) ) {
if ( isset(self::$filters['all']) )
array_pop(self::$current_filter);
return;
}
if ( !isset(self::$filters['all']) )
self::$current_filter[] = $tag;
// Sort
if ( !isset( $merged_filters[ $tag ] ) ) {
ksort(self::$filters[$tag]);
$merged_filters[ $tag ] = true;
}
reset( self::$filters[ $tag ] );
do {
foreach( (array) current(self::$filters[$tag]) as $the_ )
if ( !is_null($the_['function']) )
call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
} while ( next(self::$filters[$tag]) !== false );
array_pop(self::$current_filter);
}
/**
* did_action Retrieve the number of times an action is fired.
* #access public
* #since 0.1
* #param string $tag The name of the action hook.
* #return int The number of times action hook <tt>$tag</tt> is fired
*/
public static function did_action($tag) {
if ( ! isset( self::$actions ) || ! isset( self::$actions[$tag] ) )
return 0;
return self::$actions[$tag];
}
/**
* HELPERS
*/
/**
* current_filter Retrieve the name of the current filter or action.
* #access public
* #since 0.1
* #return string Hook name of the current filter or action.
*/
public static function current_filter() {
return end( self::$current_filter );
}
/**
* Retrieve the name of the current action.
*
* #since 0.1.2
*
* #uses current_filter()
*
* #return string Hook name of the current action.
*/
public static function current_action() {
return self::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 0.1.2
*
* #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
*/
public static function doing_filter( $filter = null ) {
if ( null === $filter ) {
return ! empty( self::$current_filter );
}
return in_array( $filter, self::$current_filter );
}
/**
* Retrieve the name of an action currently being processed.
*
* #since 0.1.2
*
* #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.
*/
public static function doing_action( $action = null ) {
return self::doing_filter( $action );
}
/**
* _filter_build_unique_id Build Unique ID for storage and retrieval.
* #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 $function is an object reference, and it does not already have a unique id.
*/
private static function _filter_build_unique_id($tag, $function, $priority) {
static $filter_id_count = 0;
if ( is_string($function) )
return $function;
if ( is_object($function) ) {
// Closures are currently implemented as objects
$function = array( $function, '' );
} else {
$function = (array) $function;
}
if (is_object($function[0]) ) {
// Object Class Calling
if ( function_exists('spl_object_hash') ) {
return spl_object_hash($function[0]) . $function[1];
} else {
$obj_idx = get_class($function[0]).$function[1];
if ( !isset($function[0]->filter_id) ) {
if ( false === $priority )
return false;
$obj_idx .= isset(self::$filters[$tag][$priority]) ? count((array)self::$filters[$tag][$priority]) : $filter_id_count;
$function[0]->filter_id = $filter_id_count;
++$filter_id_count;
} else {
$obj_idx .= $function[0]->filter_id;
}
return $obj_idx;
}
} else if ( is_string($function[0]) ) {
// Static Calling
return $function[0].$function[1];
}
}
/**
* __call_all_hook
* #access public
* #since 0.1
* #param (array) $args [description]
*/
public static function __call_all_hook($args) {
reset( self::$filters['all'] );
do {
foreach( (array) current(self::$filters['all']) as $the_ )
if ( !is_null($the_['function']) )
call_user_func_array($the_['function'], $args);
} while ( next(self::$filters['all']) !== false );
}
}//end class
/**
* Hooks Shortcuts not in class
*/
function add_action($hook, $function) {
return Hooks::add_action($hook, $function);
}
function has_action($hook, $function) {
return Hooks::has_action($hook, $function);
}
function do_action($hook, $args = '') {
return Hooks::do_action($hook, $args);
}
function remove_action($hook, $function, $priority = '') {
return Hooks::remove_action($hook, $function, $priority);
}
function remove_all_actions($hook, $priority = '') {
return Hooks::remove_all_actions($hook, $priority);
}
?>
EDIT: Heres my autoloader class:
<?php
class Autoloader {
/**
* File extension as a string. Defaults to ".php".
*/
protected static $fileExt = '.php';
/**
* The top level directory where recursion will begin. Defaults to the current
* directory.
*/
protected static $pathTop = __DIR__;
/**
* A placeholder to hold the file iterator so that directory traversal is only
* performed once.
*/
protected static $fileIterator = null;
/**
* Autoload function for registration with spl_autoload_register
*
* Looks recursively through project directory and loads class files based on
* filename match.
*
* #param string $className
*/
public static function loader($className) {
$directory = new RecursiveDirectoryIterator(static::$pathTop, RecursiveDirectoryIterator::SKIP_DOTS);
if (is_null(static::$fileIterator)) {
static::$fileIterator = new RecursiveIteratorIterator($directory, RecursiveIteratorIterator::LEAVES_ONLY);
}
$filename = $className . static::$fileExt;
foreach (static::$fileIterator as $file) {
if (strtolower($file->getFilename()) === strtolower($filename)) {
if ($file->isReadable()) {
include_once $file->getPathname();
}
break;
}
}
}
/**
* Sets the $fileExt property
*
* #param string $fileExt The file extension used for class files. Default is "php".
*/
public static function setFileExt($fileExt) {
static::$fileExt = $fileExt;
}
/**
* Sets the $path property
*
* #param string $path The path representing the top level where recursion should
* begin. Defaults to the current directory.
*/
public static function setPath($path) {
static::$pathTop = $path;
}
}
Autoloader::setFileExt('.php');
spl_autoload_register('Autoloader::loader');
?>

Answer 1

You cannot declare a class as static, but you can do the following:
restricting object instantiation:
private function __construct() {} // Constructor disabled
private function __clone() {} // Cloning disabled
private function __wakeup() {} // Serialization disabled
declare all properties static
declare all methods static
and you have a basically static-like class.
For example:
<?php
class Hooks
{
protected static $filters = [];
protected static $merged_filters = [];
protected static $actions = [];
protected static $current_filter = [];
// You don't need an instance unless you want to implement a simpleton pattern.
// protected static $_instance;
// Disable object instantiation
private function __construct() {}
private function __clone() {}
private function __serialize() {}
// You don't need this either:
// public static function getInstance() { ... }
public static function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1)
{
$idx = self::filter_build_unique_id($tag, $function_to_add, $priority);
self::$filters[$tag][$priority][$idx] = ['function' => $function_to_add, 'accepted_args' => $accepted_args];
unset( self::$merged_filters[ $tag ] );
return true;
}
//
// ...and so on...
//

Answer 2

to answer my issue of autoloader not loading my class, i moved the require to my autoloader to before session_start(); in my system and bam ! autoloaded nicely :)