How to get last two sentenses from a paragraph

[anoopd]

Hi folks,

     Does anybody have any idea to get the last two sentences from a paragraph?If it is the first 'n' then its not that difficult

for( $i=0,$w=0;$i<strlen($string);$i++ ) {
    if( $string{$i} == '.' AND  ++$w==4 ) break;
    $output .= $string{$i};
}
$outlen=strlen($output);
$output1=substr($string,0,$outlen+1);
$output2=substr($string,$outlen+1,strlen($string));

but how to get the last 4???

[Weedpacket]

Reverse the string, select the first n, then reverse the result?

By the way, [man]strpos[/man] is a much better way to find strings inside other strings.