php, append file

Question

while appending (a)names to txt file how to prevent duplicates.. kindly help..

Answer 1

before appending you can read file and check if name already in it. If file does not contain name then add it.

Answer 2

first check with a condition, if there is already a file with the same name, then if the condition is true change the name to something else

Answer 3

thanks guys.. can you pls send me the codes to read file and check if name exist in file.