global $wp_object_cache;

return $wp_object_cache->add( $key, $data, $group, $expire );

global $wp_object_cache;

return $wp_object_cache->add_multiple( $data, $group, $expire );

global $wp_object_cache;

return $wp_object_cache->incr( $key, $n, $group );

global $wp_object_cache;

return $wp_object_cache->decr( $key, $n, $group );

global $wp_object_cache;

return $wp_object_cache->close();

global $wp_object_cache;

return $wp_object_cache->delete( $key, $group );

global $wp_object_cache;

return $wp_object_cache->delete_multiple( $keys, $group );

global $wp_object_cache;

return $wp_object_cache->flush();

global $wp_object_cache;

return $wp_object_cache->flush_runtime();

global $wp_object_cache;

if ( function_exists( 'apply_filters' ) ) {

$value = apply_filters( 'pre_wp_cache_get', false, $key, $group, $force );

if ( false !== $value ) {

$found = true;

return $value;

}

}

return $wp_object_cache->get( $key, $group, $force, $found );

global $wp_object_cache;

return $wp_object_cache->get_multiple( $keys, $group, $force );

global $wp_object_cache;

return $wp_object_cache->get_multi( $groups );

global $wp_object_cache;

$wp_object_cache = new WP_Object_Cache();

global $wp_object_cache;

return $wp_object_cache->replace( $key, $data, $group, $expire );

global $wp_object_cache;

if ( defined( 'WP_INSTALLING' ) === false ) {

return $wp_object_cache->set( $key, $data, $group, $expire );

} else {

return $wp_object_cache->delete( $key, $group );

}

global $wp_object_cache;

return $wp_object_cache->set_multiple( $data, $group, $expire );

global $wp_object_cache;

return $wp_object_cache->switch_to_blog( $blog_id );

global $wp_object_cache;

$wp_object_cache->add_global_groups( $groups );

global $wp_object_cache;

$wp_object_cache->add_non_persistent_groups( $groups );

switch ( $feature ) {

case 'get_multiple':

case 'flush_runtime':

return true;

default:

return false;

}

var $global_groups = array( 'WP_Object_Cache_global' );

var $no_mc_groups = array();

var $cache = array();

/** @var Memcache[] */

var $mc = array();

var $default_mcs = array();

var $stats = array(

'get' => 0,

'get_local' => 0,

'get_multi' => 0,

'set' => 0,

'set_local' => 0,

'add' => 0,

'delete' => 0,

'delete_local' => 0,

'slow-ops' => 0,

);

var $group_ops = array();

var $cache_hits = 0;

var $cache_misses = 0;

var $global_prefix = '';

var $blog_prefix = '';

var $key_salt = '';

var $flush_group = 'WP_Object_Cache';

var $global_flush_group = 'WP_Object_Cache_global';

var $flush_key = "flush_number_v4";

var $old_flush_key = "flush_number";

var $flush_number = array();

var $global_flush_number = null;

var $cache_enabled = true;

var $default_expiration = 0;

var $max_expiration = 2592000; // 30 days

var $stats_callback = null;

var $connection_errors = array();

var $time_start = 0;

var $time_total = 0;

var $size_total = 0;

var $slow_op_microseconds = 0.005; // 5 ms

function add( $id, $data, $group = 'default', $expire = 0 ) {

$key = $this->key( $id, $group );

if ( is_object( $data ) ) {

$data = clone $data;

}

if ( in_array( $group, $this->no_mc_groups ) ) {

if ( ! isset( $this->cache[ $key ] ) ) {

$this->cache[ $key ] = [

'value' => $data,

'found' => false,

];

return true;

}

return false;

}

if ( isset( $this->cache[ $key ][ 'value' ] ) && false !== $this->cache[ $key ][ 'value' ] ) {

return false;

}

$mc = $this->get_mc( $group );

$expire = intval( $expire );

if ( 0 === $expire || $expire > $this->max_expiration ) {

$expire = $this->default_expiration;

}

$size = $this->get_data_size( $data );

$this->timer_start();

$result = $mc->add( $key, $data, false, $expire );

$elapsed = $this->timer_stop();

$comment = '';

if ( isset( $this->cache[ $key ] ) ) {

$comment .= ' [lc already]';

}

if ( false === $result ) {

$comment .= ' [mc already]';

}

$this->group_ops_stats( 'add', $key, $group, $size, $elapsed, $comment );

if ( false !== $result ) {

$this->cache[ $key ] = [

'value' => $data,

'found' => true,

];

} else if ( false === $result && true === isset( $this->cache[$key][ 'value' ] ) && false === $this->cache[$key][ 'value' ] ) {

/*

unset( $this->cache[$key] );

}

return $result;

}

public function add_multiple( array $data, $group = '', $expire = 0 ) {

$values = array();

foreach ( $data as $key => $value ) {

$values[ $key ] = $this->add( $key, $value, $group, $expire );

}

return $values;

}

function add_global_groups( $groups ) {

if ( ! is_array( $groups ) ) {

$groups = (array) $groups;

}

$this->global_groups = array_merge( $this->global_groups, $groups );

$this->global_groups = array_unique( $this->global_groups );

}

function add_non_persistent_groups( $groups ) {

if ( ! is_array( $groups ) ) {

$groups = (array) $groups;

}

$this->no_mc_groups = array_merge( $this->no_mc_groups, $groups );

$this->no_mc_groups = array_unique( $this->no_mc_groups );

}

function incr( $id, $n = 1, $group = 'default' ) {

$key = $this->key( $id, $group );

$mc = $this->get_mc( $group );

$incremented = $mc->increment( $key, $n );

$this->cache[ $key ] = [

'value' => $incremented,

'found' => false !== $incremented,

];

return $this->cache[ $key ][ 'value' ];

}

function decr( $id, $n = 1, $group = 'default' ) {

$key = $this->key( $id, $group );

$mc = $this->get_mc( $group );

$decremented = $mc->decrement( $key, $n );

$this->cache[ $key ] = [

'value' => $decremented,

'found' => false !== $decremented,

];

return $this->cache[ $key ][ 'value' ];

}

function close() {

foreach ( $this->mc as $bucket => $mc ) {

$mc->close();

}

}

function delete( $id, $group = 'default' ) {

$key = $this->key( $id, $group );

if ( in_array( $group, $this->no_mc_groups ) ) {

unset( $this->cache[ $key ] );

return true;

}

$mc = $this->get_mc( $group );

$this->timer_start();

$result = $mc->delete( $key );

$elapsed = $this->timer_stop();

$this->group_ops_stats( 'delete', $key, $group, null, $elapsed );

if ( false !== $result ) {

unset( $this->cache[ $key ] );

}

return $result;

}

public function delete_multiple( array $keys, $group = '' ) {

$values = array();

foreach ( $keys as $key ) {

$values[ $key ] = $this->delete( $key, $group );

}

return $values;

}

// Gets number from all default servers, replicating if needed

function get_max_flush_number( $group ) {

$key = $this->key( $this->flush_key, $group );

$values = array();

$size = 19; // size of microsecond timestamp serialized

foreach ( $this->default_mcs as $i => $mc ) {

$flags = false;

$this->timer_start();

$values[ $i ] = $mc->get( $key, $flags );

$elapsed = $this->timer_stop();

if ( empty( $values[ $i ] ) ) {

$this->group_ops_stats( 'get_flush_number', $key, $group, null, $elapsed, 'not_in_memcache' );

} else {

$this->group_ops_stats( 'get_flush_number', $key, $group, $size, $elapsed, 'memcache' );

}

}

$max = max( $values );

if ( ! $max > 0 ) {

return false;

}

// Replicate to servers not having the max.

$expire = 0;

foreach ( $this->default_mcs as $i => $mc ) {

if ( $values[ $i ] < $max ) {

$this->timer_start();

$mc->set( $key, $max, false, $expire );

$elapsed = $this->timer_stop();

$this->group_ops_stats( 'set_flush_number', $key, $group, $size, $elapsed, 'replication_repair' );

}

}

return $max;

}

function set_flush_number( $value, $group ) {

$key = $this->key( $this->flush_key, $group );

$expire = 0;

$size = 19;

foreach ( $this->default_mcs as $i => $mc ) {

$this->timer_start();

$mc->set( $key, $value, false, $expire );

$elapsed = $this->timer_stop();

$this->group_ops_stats( 'set_flush_number', $key, $group, $size, $elapsed, 'replication' );

}

}

function get_flush_number( $group ) {

$flush_number = $this->get_max_flush_number( $group );

// What if there is no v4 flush number?

if ( empty( $flush_number ) ) {

// Look for the v3 flush number key.

$flush_number = intval( $this->get( $this->old_flush_key, $group ) );

if ( !empty( $flush_number ) ) {

// Found v3 flush number. Upgrade to v4 with replication.

$this->set_flush_number( $flush_number, $group );

// Delete v3 key so we can't later restore it and find stale keys.

} else {

// No flush number found anywhere. Make a new one. This flushes the cache.

$flush_number = $this->new_flush_number();

$this->set_flush_number( $flush_number, $group );

}

}

return $flush_number;

}

function get_global_flush_number() {

if ( ! isset( $this->global_flush_number ) ) {

$this->global_flush_number = $this->get_flush_number( $this->global_flush_group );

}

return $this->global_flush_number;

}

function get_blog_flush_number() {

if ( ! isset( $this->flush_number[ $this->blog_prefix ] ) ) {

$this->flush_number[ $this->blog_prefix ] = $this->get_flush_number( $this->flush_group );

}

return $this->flush_number[ $this->blog_prefix ];

}

function flush_runtime() {

$this->cache = array();

$this->group_ops = array();

return true;

}

function flush() {

// Do not use the memcached flush method. It acts on an

// entire memcached server, affecting all sites.

// Flush is also unusable in some setups, e.g. twemproxy.

// Instead, rotate the key prefix for the current site.

// Global keys are rotated when flushing on any network's

// main site.

$this->cache = array();

$flush_number = $this->new_flush_number();

$this->rotate_site_keys( $flush_number );

if ( function_exists( 'is_main_site' ) && is_main_site() ) {

$this->rotate_global_keys( $flush_number );

}

return true;

}

function rotate_site_keys( $flush_number = null ) {

if ( is_null( $flush_number ) ) {

$flush_number = $this->new_flush_number();

}

$this->set_flush_number( $flush_number, $this->flush_group );

$this->flush_number[ $this->blog_prefix ] = $flush_number;

}

function rotate_global_keys( $flush_number = null ) {

if ( is_null( $flush_number ) ) {

$flush_number = $this->new_flush_number();

}

$this->set_flush_number( $flush_number, $this->global_flush_group );

$this->global_flush_number = $flush_number;

}

function new_flush_number() {

return intval( microtime( true ) * 1e6 );

}

function get( $id, $group = 'default', $force = false, &$found = null ) {

$key = $this->key( $id, $group );

$mc = $this->get_mc( $group );

$found = true;

if ( isset( $this->cache[ $key ] ) && ( ! $force || in_array( $group, $this->no_mc_groups ) ) ) {

if ( isset( $this->cache[ $key ][ 'value' ] ) && is_object( $this->cache[ $key ][ 'value' ] ) ) {

$value = clone $this->cache[ $key ][ 'value' ];

} else {

$value = $this->cache[ $key ][ 'value' ];

}

$found = $this->cache[ $key ][ 'found' ];

$this->group_ops_stats( 'get_local', $key, $group, null, null, 'local' );

} else if ( in_array( $group, $this->no_mc_groups ) ) {

$this->cache[ $key ] = [

'value' => $value = false,

'found' => false,

];

$found = false;

$this->group_ops_stats( 'get_local', $key, $group, null, null, 'not_in_local' );

} else {

$flags = false;

$this->timer_start();

$value = $mc->get( $key, $flags );

$elapsed = $this->timer_stop();

// Value will be unchanged if the key doesn't exist.

if ( false === $flags ) {

$found = false;

$value = false;

} elseif ( false === $value && ( $flags & 0xFF01 ) === 0x01 ) {

/*

$value = null;

}

$this->cache[ $key ] = [

'value' => $value,

'found' => $found,

];

if ( is_null( $value ) || $value === false ) {

$this->group_ops_stats( 'get', $key, $group, null, $elapsed, 'not_in_memcache' );

} else if ( 'checkthedatabaseplease' === $value ) {

$this->group_ops_stats( 'get', $key, $group, null, $elapsed, 'checkthedatabaseplease' );

} else {

$size = $this->get_data_size( $value );

$this->group_ops_stats( 'get', $key, $group, $size, $elapsed, 'memcache' );

}

}

if ( 'checkthedatabaseplease' === $value ) {

unset( $this->cache[ $key ] );

$found = false;

$value = false;

}

return $value;

}

function get_multi( $groups ) {

/*

$return = array();

$return_cache = array(

'value' => false,

'found' => false,

);

foreach ( $groups as $group => $ids ) {

$mc = $this->get_mc( $group );

$keys = array();

$this->timer_start();

foreach ( $ids as $id ) {

$key = $this->key( $id, $group );

$keys[] = $key;

if ( isset( $this->cache[ $key ] ) ) {

if ( is_object( $this->cache[ $key ][ 'value'] ) ) {

$return[ $key ] = clone $this->cache[ $key ][ 'value'];

$return_cache[ $key ] = [

'value' => clone $this->cache[ $key ][ 'value'],

'found' => $this->cache[ $key ][ 'found'],

];

} else {

$return[ $key ] = $this->cache[ $key ][ 'value'];

$return_cache[ $key ] = [

'value' => $this->cache[ $key ][ 'value' ],

'found' => $this->cache[ $key ][ 'found' ],

];

}

continue;

} else if ( in_array( $group, $this->no_mc_groups ) ) {

$return[ $key ] = false;

$return_cache[ $key ] = [

'value' => false,

'found' => false,

];

continue;

} else {

$fresh_get = $mc->get( $key );

$return[ $key ] = $fresh_get;

$return_cache[ $key ] = [

'value' => $fresh_get,

'found' => false !== $fresh_get,

];

}

}

$elapsed = $this->timer_stop();

$this->group_ops_stats( 'get_multi', $keys, $group, null, $elapsed );

}

$this->cache = array_merge( $this->cache, $return_cache );

return $return;

}

public function get_multiple( $keys, $group = 'default', $force = false ) {

$mc = $this->get_mc( $group );

$no_mc = in_array( $group, $this->no_mc_groups, true );

$uncached_keys = array();

$return = array();

$return_cache = array();

foreach ( $keys as $id ) {

$key = $this->key( $id, $group );

if ( isset( $this->cache[ $key ] ) && ( ! $force || $no_mc ) ) {

$value = $this->cache[ $key ]['found'] ? $this->cache[ $key ]['value'] : false;

$return[ $id ] = is_object( $value ) ? clone $value : $value;

} else if ( $no_mc ) {

$return[ $id ] = false;

$return_cache[ $key ] = [

'value' => false,

'found' => false,

];

} else {

$uncached_keys[ $id ] = $key;

}

}

if ( $uncached_keys ) {

$this->timer_start();

$uncached_keys_list = array_values( $uncached_keys );

$values = $mc->get( $uncached_keys_list );

$elapsed = $this->timer_stop();

$this->group_ops_stats( 'get_multiple', $uncached_keys_list, $group, null, $elapsed );

foreach ( $uncached_keys as $id => $key ) {

$found = array_key_exists( $key, $values );

$value = $found ? $values[ $key ] : false;

$return[ $id ] = $value;

$return_cache[ $key ] = [

'value' => $value,

'found' => $found,

];

}

}

$this->cache = array_merge( $this->cache, $return_cache );

return $return;

}

function flush_prefix( $group ) {

if ( $group === $this->flush_group || $group === $this->global_flush_group ) {

// Never flush the flush numbers.

$number = '_';

} elseif ( false !== array_search( $group, $this->global_groups ) ) {

$number = $this->get_global_flush_number();

} else {

$number = $this->get_blog_flush_number();

}

return $number . ':';

}

function key( $key, $group ) {

if ( empty( $group ) ) {

$group = 'default';

}

$prefix = $this->key_salt;

$prefix .= $this->flush_prefix( $group );

if ( false !== array_search( $group, $this->global_groups ) ) {

$prefix .= $this->global_prefix;

} else {

$prefix .= $this->blog_prefix;

}

return preg_replace( '/\s+/', '', "$prefix:$group:$key" );

}

function replace( $id, $data, $group = 'default', $expire = 0 ) {

$key = $this->key( $id, $group );

$expire = intval( $expire );

if ( 0 === $expire || $expire > $this->max_expiration ) {

$expire = $this->default_expiration;

}

$mc = $this->get_mc( $group );

if ( is_object( $data ) ) {

$data = clone $data;

}

$size = $this->get_data_size( $data );

$this->timer_start();

$result = $mc->replace( $key, $data, false, $expire );

$elapsed = $this->timer_stop();

$this->group_ops_stats( 'replace', $key, $group, $size, $elapsed );

if ( false !== $result ) {

$this->cache[ $key ] = [

'value' => $data,

'found' => true,

];

}

return $result;

}

function set( $id, $data, $group = 'default', $expire = 0 ) {

$key = $this->key( $id, $group );

if ( isset( $this->cache[ $key ] ) && ( 'checkthedatabaseplease' === $this->cache[ $key ][ 'value' ] ) ) {

return false;

}

if ( is_object( $data ) ) {

$data = clone $data;

}

$this->cache[ $key ] = [

'value' => $data,

'found' => false, // Set to false as not technically found in memcache at this point.

];

if ( in_array( $group, $this->no_mc_groups ) ) {

$this->group_ops_stats( 'set_local', $key, $group, null, null );

return true;

}

$expire = intval( $expire );

if ( 0 === $expire || $expire > $this->max_expiration ) {

$expire = $this->default_expiration;

}

$mc = $this->get_mc( $group );

$size = $this->get_data_size( $data );

$this->timer_start();

$result = $mc->set( $key, $data, false, $expire );

$elapsed = $this->timer_stop();

$this->group_ops_stats( 'set', $key, $group, $size, $elapsed );

// Update the found cache value with the result of the set in memcache.

$this->cache[ $key ][ 'found' ] = $result;

return $result;

}

public function set_multiple( array $data, $group = '', $expire = 0 ) {

$values = array();

foreach ( $data as $key => $value ) {

$values[ $key ] = $this->set( $key, $value, $group, $expire );

}

return $values;

}

function switch_to_blog( $blog_id ) {

global $table_prefix;

$blog_id = (int) $blog_id;

$this->blog_prefix = ( is_multisite() ? $blog_id : $table_prefix );

}

function colorize_debug_line( $line, $trailing_html = '' ) {

$colors = array(

'get' => 'green',

'get_local' => 'lightgreen',

'get_multi' => 'fuchsia',

'get_multiple' => 'navy',

'set' => 'purple',

'set_local' => 'orchid',

'add' => 'blue',

'delete' => 'red',

'delete_local' => 'tomato',

'slow-ops' => 'crimson',

);

$cmd = substr( $line, 0, strpos( $line, ' ' ) );

// Start off with a neutral default color...

$color_for_cmd = 'brown';

// And if the cmd has a specific color, use that instead

if ( isset( $colors[ $cmd ] ) ) {

$color_for_cmd = $colors[ $cmd ];

}

$cmd2 = "<span style='color:" . esc_attr( $color_for_cmd ) . "; font-weight: bold;'>" . esc_html( $cmd ) . "</span>";

return $cmd2 . esc_html( substr( $line, strlen( $cmd ) ) ) . "$trailing_html\n";

}

function js_toggle() {

echo "

";

}

/**

function get_stats() {

$stats = [];

$stats['totals'] = [

'query_time' => $this->time_total,

'size' => $this->size_total,

];

$stats['operation_counts'] = $this->stats;

$stats['operations'] = [];

$stats['groups'] = [];

$stats['slow-ops'] = [];

$stats['slow-ops-groups'] = [];

foreach ( $this->group_ops as $cache_group => $dataset ) {

if ( empty( $cache_group ) ) {

$cache_group = 'default';

}

foreach ( $dataset as $data ) {

$operation = $data[0];

$op = [

'key' => $data[1],

'size' => $data[2],

'time' => $data[3],

'group' => $cache_group,

'result' => $data[4],

];

if ( $cache_group === 'slow-ops' ) {

$key = 'slow-ops';

$groups_key = 'slow-ops-groups';

$op['group'] = $data[5];

$op['backtrace'] = $data[6];

} else {

$key = 'operations';

$groups_key = 'groups';

}

$stats[ $key ][ $operation ][] = $op;

if ( ! in_array( $op['group'], $stats[ $groups_key ] ) ) {

$stats[ $groups_key ][] = $op['group'];

}

}

}

return $stats;

}

function stats() {

$this->js_toggle();

echo '<h2><span>Total memcache query time:</span>' . number_format_i18n( sprintf( '%0.1f', $this->time_total * 1000 ), 1 ) . ' ms</h2>';

echo "\n";

echo '<h2><span>Total memcache size:</span>' . esc_html( size_format( $this->size_total, 2 ) ) . '</h2>';

echo "\n";

foreach ( $this->stats as $stat => $n ) {

if ( empty( $n ) ) {

continue;

}

echo '<h2>';

echo $this->colorize_debug_line( "$stat $n" );

echo '</h2>';

}

echo "<ul class='debug-menu-links' style='clear:left;font-size:14px;'>\n";

$groups = array_keys( $this->group_ops );

usort( $groups, 'strnatcasecmp' );

$active_group = $groups[0];

// Always show `slow-ops` first

if ( in_array( 'slow-ops', $groups ) ) {

$slow_ops_key = array_search( 'slow-ops', $groups );

$slow_ops = $groups[ $slow_ops_key ];

unset( $groups[ $slow_ops_key ] );

array_unshift( $groups, $slow_ops );

$active_group = 'slow-ops';

}

$total_ops = 0;

$group_titles = array();

foreach ( $groups as $group ) {

$group_name = $group;

if ( empty( $group_name ) ) {

$group_name = 'default';

}

$group_ops = count( $this->group_ops[ $group ] );

$group_size = size_format( array_sum( array_map( function ( $op ) { return $op[2]; }, $this->group_ops[ $group ] ) ), 2 );

$group_time = number_format_i18n( sprintf( '%0.1f', array_sum( array_map( function ( $op ) { return $op[3]; }, $this->group_ops[ $group ] ) ) * 1000 ), 1 );

$total_ops += $group_ops;

$group_title = "{$group_name} [$group_ops][$group_size][{$group_time} ms]";

$group_titles[ $group ] = $group_title;

echo "\t<li><a href='#' onclick='memcachedToggleVisibility( \"object-cache-stats-menu-target-" . esc_js( $group_name ) . "\", \"object-cache-stats-menu-target-\" );'>" . esc_html( $group_title ) . "</a></li>\n";

}

echo "</ul>\n";

echo "<div id='object-cache-stats-menu-targets'>\n";

foreach ( $groups as $group ) {

$group_name = $group;

if ( empty( $group_name ) ) {

$group_name = 'default';

}

$current = $active_group == $group ? 'style="display: block"' : 'style="display: none"';

echo "<div id='object-cache-stats-menu-target-" . esc_attr( $group_name ) . "' class='object-cache-stats-menu-target' $current>\n";

echo '<h3>' . esc_html( $group_titles[ $group ] ) . '</h3>' . "\n";

echo "<pre>\n";

foreach ( $this->group_ops[ $group ] as $index => $arr ) {