if you have shell access you could always use

grep -rl "text to find"

that will look at files in the current and sub directories and give you the file name and the line of text containing the text string...

Think about this a bit more, if it's s string replacement you could use sed...

sed -i 's/foo/foo_bar/g' *.php

* -i = edit the file "in-place": sed will directly modify the file if it finds anything to replace
* s = substitute the following text
* foo = the text string to be substituted
* foo_bar = the replacement string
* g = global, match all occurrences in the line


you need to be sure that the string your are searching for is unique !

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Thanks... Simon