Faster filters, maybe

faster_filters_maybe.patch

Index: wp-includes/plugin.php
===================================================================
--- wp-includes/plugin.php	(revision 21276)
+++ wp-includes/plugin.php	(working copy)
@@ -164,12 +164,26 @@
 		$args = func_get_args();
 
 	do {
-		foreach( (array) current($wp_filter[$tag]) as $the_ )
-			if ( !is_null($the_['function']) ){
-				$args[1] = $value;
-				$value = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
-			}
+		foreach( (array) current($wp_filter[$tag]) as $the_ ) {
+			if ( null !== ($the_['function']) ) {
 
+				// Skip call_user_func_array for string() accepting 1 arg
+				if ( 1 == $the_['accepted_args'] && is_string( $the_['function'] ) ) {
+					$args[1] = $value;
+					$value = $the_['function']( $args[1] );
+
+				// Skip call_user_func_array for object->method() accepting 1 arg
+				} elseif ( 1 == $the_['accepted_args'] && is_array( $the_['function']) && is_object( $the_['function'][0] ) ) {
+					$args[1] = $value;
+					$value = $the_['function'][0]->$the_['function'][1]( $args[1] );
+
+				// Default case
+				} else {
+					$args[1] = $value;
+					$value = call_user_func_array($the_['function'], array_slice($args, 1, (int) $the_['accepted_args']));
+				}
+			}
+		}
 	} while ( next($wp_filter[$tag]) !== false );
 
 	array_pop( $wp_current_filter );
@@ -222,10 +236,23 @@
 	reset( $wp_filter[ $tag ] );
 
 	do {
-		foreach( (array) current($wp_filter[$tag]) as $the_ )
-			if ( !is_null($the_['function']) )
-				$args[0] = call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
+		foreach( (array) current($wp_filter[$tag]) as $the_ ) {
+			if ( null !== $the_['function'] ) {
 
+				// Skip call_user_func_array for string() accepting 1 arg
+				if ( 1 == $the_['accepted_args'] && is_string( $the_['function'] ) ) {
+					$args[0] = $the_['function']( $args[0] );
+
+				// Skip call_user_func_array for object->method() accepting 1 arg
+				} elseif ( 1 == $the_['accepted_args'] && is_array( $the_['function']) && is_object( $the_['function'][0] ) ) {
+					$args[0] = $the_['function'][0]->$the_['function'][1]( $args[0] );
+
+				// Default case
+				} else {
+					$args[0] = call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
+				}
+			}
+		}
 	} while ( next($wp_filter[$tag]) !== false );
 
 	array_pop( $wp_current_filter );
@@ -398,10 +425,23 @@
 	reset( $wp_filter[ $tag ] );
 
 	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) $the_['accepted_args']));
+		foreach ( (array) current($wp_filter[$tag]) as $the_ ) {
+			if ( null !== $the_['function']) {
 
+				// Skip call_user_func_array for string() accepting 1 arg
+				if ( 1 == $the_['accepted_args'] && is_string( $the_['function'] ) ) {
+					$the_['function']( $args[0] );
+
+				// Skip call_user_func_array for object->method() accepting 1 arg
+				} elseif ( 1 == $the_['accepted_args'] && is_array( $the_['function']) && is_object( $the_['function'][0] ) ) {
+					$the_['function'][0]->$the_['function'][1]( $args[0] );
+
+				// Default case
+				} else {
+					call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
+				}
+			}
+		}
 	} while ( next($wp_filter[$tag]) !== false );
 
 	array_pop($wp_current_filter);
@@ -479,10 +519,23 @@
 	reset( $wp_filter[ $tag ] );
 
 	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) $the_['accepted_args']));
+		foreach( (array) current($wp_filter[$tag]) as $the_ ) {
+			if ( null !== $the_['function'] ) {
+
+				// Skip call_user_func_array for string() accepting 1 arg
+				if ( 1 == $the_['accepted_args'] && is_string( $the_['function'] ) ) {
+					$the_['function']( $args[0] );
+
+				// Skip call_user_func_array for object->method() accepting 1 arg
+				} elseif ( 1 == $the_['accepted_args'] && is_array( $the_['function']) && is_object( $the_['function'][0] ) ) {
+					$the_['function'][0]->$the_['function'][1]( $args[0] );
 
+				// Default case
+				} else {
+					$value = call_user_func_array($the_['function'], array_slice($args, 0, (int) $the_['accepted_args']));
+				}
+			}
+		}
 	} while ( next($wp_filter[$tag]) !== false );
 
 	array_pop($wp_current_filter);
@@ -710,7 +763,7 @@
 	reset( $wp_filter['all'] );
 	do {
 		foreach( (array) current($wp_filter['all']) as $the_ )
-			if ( !is_null($the_['function']) )
+			if ( null !== $the_['function'] )
 				call_user_func_array($the_['function'], $args);
 
 	} while ( next($wp_filter['all']) !== false );