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<?php
//
// Filter functions, the core of the WP plugin architecture.
//
function add_filter($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
global $wp_filter;
// So the format is wp_filter['tag']['array of priorities']['array of functions serialized']['array of ['array (functions, accepted_args)]']
$wp_filter[$tag][$priority][serialize($function_to_add)] = array('function' => $function_to_add, 'accepted_args' => $accepted_args);
return true;
}
function apply_filters($tag, $string) {
global $wp_filter;
merge_filters($tag);
if ( !isset($wp_filter[$tag]) )
return $string;
$args = func_get_args();
do{
foreach( (array) current($wp_filter[$tag]) as $the_ )
if ( !is_null($the_['function']) ){
$args[1] = $string;
$string = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
}
} while ( next($wp_filter[$tag]) );
return $string;
}
function merge_filters($tag) {
global $wp_filter;
if ( isset($wp_filter['all']) )
$wp_filter[$tag] = array_merge($wp_filter['all'], (array) $wp_filter[$tag]);
if ( isset($wp_filter[$tag]) ){
reset($wp_filter[$tag]);
uksort($wp_filter[$tag], "strnatcasecmp");
}
}
function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
global $wp_filter;
unset($GLOBALS['wp_filter'][$tag][$priority][serialize($function_to_remove)]);
return true;
}
//
// Action functions
//
function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
add_filter($tag, $function_to_add, $priority, $accepted_args);
}
function do_action($tag, $arg = '') {
global $wp_filter, $wp_actions;
$args = array();
if ( is_array($arg) && 1 == count($arg) && is_object($arg[0]) ) // array(&$this)
$args[] =& $arg[0];
else
$args[] = $arg;
for ( $a = 2; $a < func_num_args(); $a++ )
$args[] = func_get_arg($a);
merge_filters($tag);
if ( !isset($wp_filter[$tag]) )
return;
do{
foreach( (array) current($wp_filter[$tag]) as $the_ )
if ( !is_null($the_['function']) )
call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
} while ( next($wp_filter[$tag]) );
if ( is_array($wp_actions) )
$wp_actions[] = $tag;
else
$wp_actions = array($tag);
}
// Returns the number of times an action has been done
function did_action($tag) {
global $wp_actions;
return count(array_keys($wp_actions, $tag));
}
function do_action_ref_array($tag, $args) {
global $wp_filter, $wp_actions;
if ( !is_array($wp_actions) )
$wp_actions = array($tag);
else
$wp_actions[] = $tag;
merge_filters($tag);
if ( !isset($wp_filter[$tag]) )
return;
do{
foreach( (array) current($wp_filter[$tag]) as $the_ )
if ( !is_null($the_['function']) )
call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
} while ( next($wp_filter[$tag]) );
}
function remove_action($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
remove_filter($tag, $function_to_remove, $priority, $accepted_args);
}
//
// Functions for handling plugins.
//
function plugin_basename($file) {
$file = preg_replace('|\\\\+|', '\\\\', $file);
$file = preg_replace('/^.*wp-content[\\\\\/]plugins[\\\\\/]/', '', $file);
return $file;
}
function register_activation_hook($file, $function) {
$file = plugin_basename($file);
add_action('activate_' . $file, $function);
}
function register_deactivation_hook($file, $function) {
$file = plugin_basename($file);
add_action('deactivate_' . $file, $function);
}
?>
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