Append mean

Answer 1

append means add something, generaly use to add a value at the end of an array

Answer 2

Append means adding something instead of overwriting. for example $x="text"; $y="123";
$x = $x . $y; I appended "123" to "text".

Answer 3

if there is any content in the file and you want to add new content then it will be added after the file content can not replace it ...;)