function lengthOfLastWord($s) {
$strlen = strlen($s);
$res = 0;
for ($i = $strlen - 1; $i >= 0; $i--) {
if ($s[$i] == " " && $res > 0) {
return $res;
}elseif($s[$i] != " "){
$res++;
}
}
return $res;
}
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