var $stack;

var $profile;

// constructor

function WPProfiler() {

$this->stack = array();

$this->profile = array();

}

function start($name) {

$time = $this->microtime();

if (!$this->stack) {

// log all actions and filters

add_filter('all', array($this, 'log_filter'));

}

// reset the wpdb queries log, storing it on the profile stack if necessary

global $wpdb;

if ($this->stack) {

$this->stack[count($this->stack)-1]['queries'] = $wpdb->queries;

}

$wpdb->queries = array();

global $wp_object_cache;

$this->stack[] = array(

'start' => $time,

'name' => $name,

'cache_cold_hits' => $wp_object_cache->cold_cache_hits,

'cache_warm_hits' => $wp_object_cache->warm_cache_hits,

'cache_misses' => $wp_object_cache->cache_misses,

'cache_dirty_objects' => $this->_dirty_objects_count($wp_object_cache->dirty_objects),

'actions' => array(),

'filters' => array(),

'queries' => array(),

);

}

function stop() {

$item = array_pop($this->stack);

$time = $this->microtime($item['start']);

$name = $item['name'];

global $wpdb;

$item['queries'] = $wpdb->queries;

global $wp_object_cache;

$cache_dirty_count = $this->_dirty_objects_count($wp_object_cache->dirty_objects);

$cache_dirty_delta = $this->array_sub($cache_dirty_count, $item['cache_dirty_objects']);

if (isset($this->profile[$name])) {

$this->profile[$name]['time'] += $time;

$this->profile[$name]['calls'] ++;

$this->profile[$name]['cache_cold_hits'] += ($wp_object_cache->cold_cache_hits - $item['cache_cold_hits']);

$this->profile[$name]['cache_warm_hits'] += ($wp_object_cache->warm_cache_hits - $item['cache_warm_hits']);

$this->profile[$name]['cache_misses'] += ($wp_object_cache->cache_misses - $item['cache_misses']);

$this->profile[$name]['cache_dirty_objects'] = array_add( $this->profile[$name]['cache_dirty_objects'], $cache_dirty_delta) ;

$this->profile[$name]['actions'] = array_add( $this->profile[$name]['actions'], $item['actions'] );

$this->profile[$name]['filters'] = array_add( $this->profile[$name]['filters'], $item['filters'] );

$this->profile[$name]['queries'] = array_add( $this->profile[$name]['queries'], $item['queries'] );

#$this->_query_summary($item['queries'], $this->profile[$name]['queries']);

}

else {

$queries = array();

$this->_query_summary($item['queries'], $queries);

$this->profile[$name] = array(

'time' => $time,

'calls' => 1,

'cache_cold_hits' => ($wp_object_cache->cold_cache_hits - $item['cache_cold_hits']),

'cache_warm_hits' => ($wp_object_cache->warm_cache_hits - $item['cache_warm_hits']),

'cache_misses' => ($wp_object_cache->cache_misses - $item['cache_misses']),

'cache_dirty_objects' => $cache_dirty_delta,

'actions' => $item['actions'],

'filters' => $item['filters'],

'queries' => $queries,

);

}

if (!$this->stack) {

remove_filter('all', array($this, 'log_filter'));

}

}

function microtime($since = 0.0) {

list($usec, $sec) = explode(' ', microtime());

return (float)$sec + (float)$usec - $since;

}

function log_filter($tag) {

if ($this->stack) {

global $wp_actions;

if ($tag == end($wp_actions))

@$this->stack[count($this->stack)-1]['actions'][$tag] ++;

else

@$this->stack[count($this->stack)-1]['filters'][$tag] ++;

}

return $arg;

}

function log_action($tag) {

if ($this->stack)

@$this->stack[count($this->stack)-1]['actions'][$tag] ++;

}

function _current_action() {

global $wp_actions;

return $wp_actions[count($wp_actions)-1];

}

function results() {

return $this->profile;

}

function _query_summary($queries, &$out) {

foreach ($queries as $q) {

$sql = $q[0];

$sql = preg_replace('/(WHERE \w+ =) \d+/', '$1 x', $sql);

$sql = preg_replace('/(WHERE \w+ =) \'\[-\w]+\'/', '$1 \'xxx\'', $sql);

@$out[$sql] ++;

}

asort($out);

return;

}

function _query_count($queries) {

// this requires the savequeries patch at https://core.trac.wordpress.org/ticket/5218

$out = array();

foreach ($queries as $q) {

if (empty($q[2]))

@$out['unknown'] ++;

else

@$out[$q[2]] ++;

}

return $out;

}

function _dirty_objects_count($dirty_objects) {

$out = array();

foreach (array_keys($dirty_objects) as $group)

$out[$group] = count($dirty_objects[$group]);

return $out;

}

function array_add($a, $b) {

$out = $a;

foreach (array_keys($b) as $key)

if (array_key_exists($key, $out))

$out[$key] += $b[$key];

else

$out[$key] = $b[$key];

return $out;

}

function array_sub($a, $b) {

$out = $a;

foreach (array_keys($b) as $key)

if (array_key_exists($key, $b))

$out[$key] -= $b[$key];

return $out;

}

function print_summary() {

$results = $this->results();

printf("\nname calls time action filter warm cold misses dirty\n");

foreach ($results as $name=>$stats) {

printf("%24.24s %6d %6.4f %6d %6d %6d %6d %6d %6d\n", $name, $stats['calls'], $stats['time'], array_sum($stats['actions']), array_sum($stats['filters']), $stats['cache_warm_hits'], $stats['cache_cold_hits'], $stats['cache_misses'], array_sum($stats['cache_dirty_objects']));

}

}