Common: “ ” ‘ ’ – — … ‐ ‒ ° © ® ™ • ½ ¼ ¾ ⅓ ⅔ † ‡ µ ¢ £ € « » ♠ ♣ ♥ ♦ ¿ � Math: – × ÷ ± ∞ π ∅ ≤ ≥ ≠ ≈ ∧ ∨ ∩ ∪ ∈ ∀ ∃ ∄ ∑ […]
htaccess : remove .php extension to permalink
RewriteCond %{REQUEST_FILENAME} !-f RewriteRule ^([^.]+)$ $1.php [NC,L]
mu-plugins : option_active_plugins disable plugins Hint!
wp-content/mu-plugins/load.php