PR - PHP Standard anomalies

@ kilishan
https://forum.codeigniter.com/thread-743...#pid367516

You are free to submit a PR for that, of course. However the integer '1' is typecast to the string '1' when strict is not defined so it's not strictly necessary, but no harm being proper on that.

PR #1
# ini_set() expects parameter 2 to be string, integer given

file: app/Config/Boot/development.php - line # 11
# ini_set('display_errors', 1);
  ini_set('display_errors', '1');


PR #2
# ini_set() expects parameter 2 to be string, integer given

file: app/Config/Boot/production.php - line # 10
# ini_set('display_errors', 1);
  ini_set('display_errors', '1');


PR #3
# strlen() expects parameter string, integer given

file: system/Debug/exceptions.php - line # 466
# $format = '% ' . strlen($start + $lines) . 'd';
  $format = '% ' . strlen(sprintf('%sd', $start + $lines));


PR #4
# DateTime::createFromFormat() expects string, integer given

file: system/HTTP/Response.php - line # 717
# $this->setDate(\DateTime::createFromFormat('U', time()));
  $this->setDate(\DateTime::createFromFormat('U', (string) time())); // John added (string)


PR #5
# switch() parameter expects string, NULL given

file: system/HTTP/Request.php - line # 237
# switch (strtolower($which) )
  switch (strtolower( (string) $which) )