Is there a function in PHP to do this? I know of stripos and strrpos, but that's just the first and last.

    I know of stripos and strrpos, but that's just the first and last.

    Not quite. They're the first and last starting from a certain position, with the default being the first character.

    Try this:

    function nth_strpos($str, $substr, $n, $stri = false)
{
    if ($stri) {
        $str = strtolower($str);
        $substr = strtolower($substr);
    }
    $ct = 0;
    $pos = 0;
    while (($pos = strpos($str, $substr, $pos)) !== false) {
        if (++$ct == $n) {
            return $pos;
        }
        $pos++;
    }
    return false;
}

    Edit: Here's a demo:

    $txt = 'Now is the time for all good men to come to the aid of their party.';
$subtxt = 'THE';
if (($nth = nth_strpos($txt, $subtxt, 3, true)) !== false) {
    echo substr($txt, $nth);
} else {
    echo 'Not found';
}

// Displays:
// their party.
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