Editing and modifying an existing text file

[ganesanji]

hi to all,


I am new to php. I have to edit a text file using php. I saw the file system concepts modes. My problem is I want to change a particular text or word in a text file. How to find the index of the specific word. Is there any functions or methods available for change a particular word or finding index of a word...
For the example, consider a text file named ganesh.txt which content is shown below....
ganesh
is
working
in
php.


The ganesh.txt file conent is shown above ended with php.In that file I want to change the words "ganesh" to "Dinesh" and "php" to "java" and "is" as "was".
Please tell me any simple method to do this......It is very urgent.......
Anybody help me.........Advance thanks for all........plz help me......

[realin]

what u can do is open the file in write mode.. using the inbuilt function fopen() it will place ur pointer to the start of the file.. now read file line by line.. use preg_replace() to change the text and store back to the file.
or grab the contents in a varible, change it using preg_replace() again and write it back to the file..