how to use php to modify a word in many .html page?

i want to exchange certain words in many htm pages, how to do?

 

Do they have to be htm files? If you are able to make them php files then include a file with a constant representing the text you want to display...

Otherwise I'd create a php file with an array for each filename you need to edit. Read the file into a string. Replace the string and then save it back.

Loop through the array and repeat the action for each file

 

for example, i want to let all money in the pages become, quick money, what to do?