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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 $wp_filter;
// check that we don't already have the same filter at the same priority
if ( isset($wp_filter[$tag]["$priority"]) ) {
foreach ( $wp_filter[$tag]["$priority"] as $filter ) {
// uncomment if we want to match function AND accepted_args
// if ( $filter == array($function, $accepted_args) ) {
if ( $filter['function'] == $function_to_add )
return true;
}
}
// So the format is wp_filter['tag']['array of priorities']['array of ['array (functions, accepted_args)]']
$wp_filter[$tag]["$priority"][] = array('function'=>$function_to_add, 'accepted_args'=>$accepted_args);
return true;
}
function apply_filters($tag, $string) {
global $wp_filter;
$args = array();
for ( $a = 2; $a < func_num_args(); $a++ )
$args[] = func_get_arg($a);
merge_filters($tag);
if ( !isset($wp_filter[$tag]) )
return $string;
foreach ( (array) $wp_filter[$tag] as $priority => $functions ) {
if ( !is_null($functions) ) {
foreach ( (array) $functions as $function ) {
$function_name = $function['function'];
$accepted_args = $function['accepted_args'];
$the_args = $args;
array_unshift($the_args, $string);
if ( $accepted_args > 0 )
$the_args = array_slice($the_args, 0, $accepted_args);
elseif ( 0 == $accepted_args )
$the_args = NULL;
$string = call_user_func_array($function_name, $the_args);
}
}
}
return $string;
}
function merge_filters($tag) {
global $wp_filter;
if ( isset($wp_filter['all']) ) {
foreach ( (array) $wp_filter['all'] as $priority => $functions ) {
if ( isset($wp_filter[$tag][$priority]) )
$wp_filter[$tag][$priority] = array_merge($wp_filter['all'][$priority], $wp_filter[$tag][$priority]);
else
$wp_filter[$tag][$priority] = array_merge($wp_filter['all'][$priority], array());
$wp_filter[$tag][$priority] = array_unique($wp_filter[$tag][$priority]);
}
}
if ( isset($wp_filter[$tag]) )
uksort( $wp_filter[$tag], "strnatcasecmp" );
}
function remove_filter($tag, $function_to_remove, $priority = 10, $accepted_args = 1) {
global $wp_filter;
// rebuild the list of filters
if ( isset($wp_filter[$tag]["$priority"]) ) {
$new_function_list = array();
foreach ( (array) $wp_filter[$tag]["$priority"] as $filter ) {
if ( $filter['function'] != $function_to_remove )
$new_function_list[] = $filter;
}
$wp_filter[$tag]["$priority"] = $new_function_list;
}
return true;
}
//
// Action functions
//
function add_action($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;
foreach ( (array) $wp_filter[$tag] as $priority => $functions ) {
if ( !is_null($functions) ) {
foreach ( (array) $functions as $function ) {
$function_name = $function['function'];
$accepted_args = $function['accepted_args'];
if ( $accepted_args > 0 )
$the_args = array_slice($args, 0, $accepted_args);
elseif ( $accepted_args == 0 )
$the_args = NULL;
else
$the_args = $args;
call_user_func_array($function_name, $the_args);
}
}
}
if ( is_array($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;
foreach ( (array) $wp_filter[$tag] as $priority => $functions ) {
if ( !is_null($functions) ) {
foreach ( (array) $functions as $function ) {
$function_name = $function['function'];
$accepted_args = $function['accepted_args'];
if ( $accepted_args > 0 )
$the_args = array_slice($args, 0, $accepted_args);
elseif ( 0 == $accepted_args )
$the_args = NULL;
else
$the_args = $args;
call_user_func_array($function_name, $the_args);
}
}
}
}
function remove_action($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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