sed -i "s/新内容/原内容/g" `ls *.html`

sed -i "s/新内容/原内容/g/g" `ls *.php`

sed -i "s/s/新内容/原内容/g/g" `ls **/*.php`

sed -i "s/s/新内容/原内容/g/g" `ls **/**/*.php`