如何使用PHP创建关键字列表的列表

Question

I want to do something with PHP .

I have this list of names :

first
second 
third
forth 

Now i want to have this :

first,second,third,forth

How can this happen with a little PHP code ?

Answer 1

Assuming that you have those in array

$arr=array('first','second');
$str=implode(",",$arr);

EDIT(assuming each names are on the new line, i will replace with ,)

$str=file_get_contents("filename.txt");
$newstr=str_replace("
",',',$str);
$newstr=trim($newstr, ",");//to remove the last comma 
echo $newstr;