last version

index.php

 <?php
 $start = microtime(true);
 /**
- * "Happy tickets"
+ * "The Happy Tickets"
  *
  * host/?first=000001&end=124555
  *
@@ -14,20 +14,22 @@ if (!isset ($_GET['first'], $_GET['end'])) {
 if (!ctype_digit($_GET['first']) || !ctype_digit($_GET['end'])) {
     exit('You haven`t passed the parameters.');
 }
-
 if (strlen($_GET['first']) !== 6 || strlen($_GET['end']) !== 6) {
     exit('You must enter parameters in format 000XXX!!');
 }
-
 if (((int)$_GET['end'] - (int)$_GET['first']) <= 0) {
     exit('The first parameter must be less than the second!');
 }
+/* "The Happy Tickets" are not in sequence from 0 to 10 */
+if ((int)$_GET['end'] < 1001) {
+    exit('0 "The Happy Tickets" is in the indicated sequence ');
+}
 
 $current = (int)$_GET['end'];
-$num = $current;
 $ticketsHappy = 0;
 $currentLeft = intdiv($current, 1000);
 $currentRight = $current % 1000;
+
 $sumNumber = static function ($num) {
     $sumCurrent = 0;
     while ($num > 0) {
@@ -39,12 +41,12 @@ $sumNumber = static function ($num) {
     }
     return $sumCurrent;
 };
+
 while ($currentLeft > 0) {
     $sumCurrentLeft = $sumNumber($currentLeft);
     while ($currentRight >= 0) {
         $sumCurrentRight = $sumNumber($currentRight);
         if ($sumCurrentLeft === $sumCurrentRight ) {
-            //echo($current.'<br/>');
             ++$ticketsHappy;
         }
         --$currentRight;

ticket.php

 <?php
+
 /**
  * "Happy tickets"
  *
@@ -6,142 +7,50 @@
  *
  * @author   Alexandr Sitchenko <alexsitch@outlook.com>
  */
-define('LENGTH_NUMBER_TICKET', 6);
-define('CHARACTERS_BY_HAPPY', 3);
 
-checkStartParameters();
+if (!isset ($_GET['first'], $_GET['end'])) {
+    exit('You haven`t passed the parameters.');
+}
+if (!ctype_digit($_GET['first']) || !ctype_digit($_GET['end'])) {
+    exit('You haven`t passed the parameters.');
+}
+if (strlen($_GET['first']) !== 6 || strlen($_GET['end']) !== 6) {
+    exit('You must enter parameters in format 000XXX!!');
+}
+if (((int)$_GET['end'] - (int)$_GET['first']) <= 0) {
+    exit('The first parameter must be less than the second!');
+}
 
-$data = [
-    'first' => (int)$_GET['first'],
-    'end' => (int)$_GET['end']
-];
-$current = $data['first'];
+$current = (int)$_GET['end'];
 $ticketsHappy = 0;
+$currentLeft = intdiv($current, 1000);
+$currentRight = $current % 1000;
 
-/* Numbers are not prepare in the range 100000 - 999999 */
-$zeroBeginNumber = checkNumbersAtRange($current);
-
-/* Main Block */
-do {
-    if (!$zeroBeginNumber) {
-        $ticketsCurrentNumber = $current;
-    } else {
-        $zeroBeginNumber = checkNumbersAtRange($current);
-        $ticketsCurrentNumber = prepareNumberTicketsByHappy($current);
-    }
-
-    if (checkHappyTicket($ticketsCurrentNumber)) {
-        //echo $ticketsCurrentNumber . '<br>';
-        $ticketsHappy++;
-    }
-
-    $current++;
-
-} while ((bool)($data['end'] - $current));
-
-echo $ticketsHappy;
-/*End Main Block */
-
-/**
- * @param string $message
- */
-function exitScript(string $message): void
-{
-    exit ($message);
-}
-
-/**
- * @return bool
- */
-function checkStartParameters(): bool
-{
-    if (!isset ($_GET['first'], $_GET['end'])) {
-        exitScript('You haven`t passed the parameters!');
+$sumNumber = static function ($num) {
+    $sumCurrent = 0;
+    while ($num > 0) {
+        $sumCurrent += $num % 10;
+        $num = intdiv($num, 10);
     }
-
-    $first = $_GET['first'];
-    $end = $_GET['end'];
-
-    if (!ctype_digit($first) || !ctype_digit($end)) {
-        exitScript('You must enter the correct parameters!');
+    if ($sumCurrent > 9) {
+        $sumCurrent = ($sumCurrent % 10) + intdiv($sumCurrent, 10);
     }
-
-    if (checkStartLength($first) || checkStartLength($end)) {
-        exitScript('You must enter parameters in format 000XXX!');
+    return $sumCurrent;
+};
+
+while ($currentLeft > 0) {
+    $sumCurrentLeft = $sumNumber($currentLeft);
+    while ($currentRight >= 0) {
+        $sumCurrentRight = $sumNumber($currentRight);
+        if ($sumCurrentLeft === $sumCurrentRight ) {
+            ++$ticketsHappy;
+        }
+        --$currentRight;
     }
-
-    if (((int)$end - (int)$first) <= 0) {
-        exitScript('The first parameter must be less than the second!');
+    if ($currentLeft > 0) {
+        $currentRight = 999;
     }
-
-    return true;
+    --$currentLeft;
 }
 
-/**
- * Numbers are checked by length at start
- *
- * @param string $number
- *
- * @return bool
- */
-function checkStartLength(string $number) {
-    return (strlen($number) < LENGTH_NUMBER_TICKET);
-}
-/**
- * Numbers are checked in the range 100000 - 999999
- *
- * @param int $number
- *
- * @return bool
- */
-function checkNumbersAtRange(int $number): bool
-{
-    $figureInNumber = strlen((string)$number);
-    return ($figureInNumber < LENGTH_NUMBER_TICKET);
-}
-
-/**
- * Zeros are added to the beginning of the current number.
- *
- * @param int $number
- *
- * @return string
- */
-function prepareNumberTicketsByHappy(int $number): string
-{
-    return str_repeat('0', strlen((string)$number)) . $number;
-}
-
-/**
- * The main function at this test :)
- *
- * @param string $ticketsNumber
- *
- * @return bool
- */
-function checkHappyTicket(string $ticketsNumber): bool
-{
-    $firstSum = sumCharacters(substr($ticketsNumber, 0, CHARACTERS_BY_HAPPY));
-    $endSum = sumCharacters(substr($ticketsNumber, CHARACTERS_BY_HAPPY * (-1), CHARACTERS_BY_HAPPY));
-    return ($firstSum === $endSum);
-}
-
-/**
- * Summation of a number
- *
- * @param string $sequence
- *
- * @return int
- */
-function sumCharacters(string $sequence): int
-{
-    $num = (int)$sequence;
-    $sum = 0;
-
-    while ($num > 0) {
-        $modulo = $num % 10;
-        $sum += $modulo;
-        $num = (int)$num / 10;
-    }
-    return $sum;
-}
\ No newline at end of file
+echo $ticketsHappy;