In PHP 5.3 there is a nice function that seems to do what I want:
strstr(input,\"\\n\",true)
Unfortunately, the server runs PHP 5.2.17 and the
A quick way to get first n lines of a string, as a string, while keeping the line breaks.
Example 6 first lines of $multilinetxt
echo join("\n",array_splice(explode("\n", $multilinetxt),0,6));
Can be quickly adapted to catch a particular block of text, example from line 10 to 13:
echo join("\n",array_splice(explode("\n", $multilinetxt),9,12));