hgc81538

/etc/sysctl.conf
net.core.somaxconn = 8192
net.ipv4.tcp_max_syn_backlog = 8192

// mysql
Connection failed: SQLSTATE[HY000] [1040] Too many connections
Connection failed: SQLSTATE[HY000] [2002] Resource temporarily unavailable

fix:
/etc/systemd/system/mysql.service

hgc81538

# mysql 8 / mariadb 10.11
mysql -u root

CREATE DATABASE <database_name> CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
CREATE DATABASE <database_name> CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci;

CREATE USER '<username>'@'localhost' IDENTIFIED BY '<password>';
GRANT ALL PRIVILEGES ON <database_name>.* TO '<username>'@'localhost';
flush privileges;

hgc81538

<?php

global $wp_query;
$wp_query->set_404();
status_header(404);
include '404.php';
exit;

hgc81538

In Windows environment, the error is occured when executing "gem install compass" in cygwin.
$ gem install compass
ERROR:  While executing gem ... (ArgumentError)
    invalid byte sequence in UTF-8

How to solve:
1) open C:\cygwin\usr\share\ruby\2.0.0\win32\registry.rb
(change to your version when necessary)

2) comment out line 172 and change "\r" to "\r\n" in line 173 (line numbers may vary)

hgc81538

<?php

// original code is from http://stackoverflow.com/questions/7489742/php-read-exif-data-and-adjust-orientation
function image_fix_orientation($path){
	$image = imagecreatefromjpeg($path);
	$exif = exif_read_data($path);

	if (!empty($exif['Orientation'])) {
		switch ($exif['Orientation']) {
			case 3: