fwrite append , appending before php end

Question

i would like to store a string into a .php file,but as such , its a php script itself , in which i would like to add array(s),but so far i always append string like this

<?php
$.....
....
?>

but i would like to only add the content without opening and closing new block of code. so to have only one opening and closing of script , thus appending before the actual end of file. How can i efficiently move the pointer like this ?

my function so far looks like this

 $fw = fopen('../Resource/articlelist.php',"a");
 .....
 fwrite ($fw,$diffWrite);

Answer 1

The PHP interpreter doesn't require a closing ?> on the end of files, just omit that and you it will work the same.

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(just to answer the title of the question)
For moving the internal pointer of the file resource, there's fseek().

$fd = fopen('file', 'a');
fseek($fd, -3, SEEK_END); // now the pointer is at the end -3 bytes

You can create a loop that reads in chunks from the end moving backwards and search for the first ?> if you want to make this appending more robust.