TalkPHP - Adding text to a file..

Hey!

I have a file, just a basic .html file.
And I want to open it, scroll down to something that I want to match, and below it add the new data.

So let's say like this:

Code:

customer id: 4

customer mail: gaga@eat.bullshit



---------------

customer id: 5

customer mail: nono@somethings.notright

That's our file.html.
I want to search for "gaga@eat.bullshit" and add below that more content:

Code:

customer id: 4

customer mail: gaga@eat.bullshit

customer name: Tanax

customer location: TalkPHP



---------------

customer id: 5

customer mail: nono@somethings.notright

For example..

How would I accomplish that??
Thanks in advance!

function file_intersperse_contents($szFilename, $szAfter, $szInject)
{
$szContent = file_get_contents($szFilename);
$szContent = str_replace($szAfter, $szAfter . $szInject, $szContent);
file_put_contents($szFilename, $szContent);
}

file_intersperse_contents
(
'./file.html',
'gaga@eat.bullshit',
"\ncustomer name: Tanax\ncustomer location: TalkPHP"

);