1. PHP
Javascript HTML
SQL
header('Content-Type: text/html; charset=utf-8')
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
html_entity_decode(ENT_QUOTES)
mysql_real_escape_string()
SET CHARACTER SET 'utf8'
SET collation_connection = 'utf8_general_ci'
htmlentities(ENT_QUOTES)
en-/decodeURIComponent()
AJAX
ECHO
QUERY