starts with + ends with functions

startswith.php

<?php
abstract class Str {
  public static function StartsWith($haystack, $needle, $case_insensitive=false) {
      if($case_insensitive) {
          $haystack = strtolower($haystack);
          $needle = strtolower($needle);
      }
      return substr($haystack, 0, strlen($needle)) === $needle;
  }
  
  public static function EndsWith($haystack, $needle, $case_insensitive=false) {
      if($case_insensitive) {
          $haystack = strtolower($haystack);
          $needle = strtolower($needle);
      }
      return substr($haystack, -strlen($needle)) === $needle;
  }
}