/Applications/MAMP/conf/apache を2か所編集する

apache(515行目付近)


# 編集前

    #AddType text/html .shtml
    #AddOutputFilter INCLUDES .shtml

#===================

# 編集後 

    AddType text/html .shtml
    AddOutputFilter INCLUDES .shtml .html .htm .php

apache(200行目付近)


# 編集前
<Directory />
    Options Indexes FollowSymLinks
    AllowOverride None 
</Directory>

#===================

# 編集後 

<Directory />
    Options Indexes FollowSymLinks
    AllowOverride All
    AddType application/x-httpd-php .htm .html 
</Directory>