在PHP中的两个文本字符串之间写入文本

Question

Lets say I have this data in a file (externalfile.txt)

#1#First#/1#
#2#Something#/2#

#end#

I want to write text between #/2# and #end# , How to do this?

Answer 1

Not sure if it's the proper way but you may take a look

$newval='new text';
$file_contents = file_get_contents('externalfile.txt');
file_put_contents('externalfile.txt', preg_replace("/#\/2#/", "#/2#\n$newval\n", $file_contents));

It works, anyway.

Answer 2

This PHP code inserts a new text right before the last occurence of the #end# string:

$str = file_get_contents('file.txt');
$splitted = explode('#end#',$str);
$pos = count($splitted)-2;
$splitted[$pos] .= 'new text';
$str = implode('#end#',$splitted);
echo $str;