convert array to string

[rpapaiof]

how can i convert an array to string my problem is the following
i have a TXT file that contain some numbers
i have to read them from file put them in array then i have to put 3 radio buttons with following functions
ascend sort of array
descend sort
and reverse
after each function i have to write changed for of array into a new file.
i have problem with writing them in new file.
please help me

[TheMadMidget]

implode(separat or,array)

http://www.w3schools.com/php/func_string_implode.asp

[rpapaiof]

implode(separat or,array)
http://www.w3schools.com/php/func_string_implode.asp

thank u for your help my friend

[Artnessde]

just my 2cent:

maybe a better solution would be to write the data serialized() or json_encode()'e d to the file?