Fix some deprecation warnings (#64)

* Fix PHP 8.1 deprecation warnings on Helper and FormHelper

- fix deprecation warning when Helper::_entityPath is null
- fix `strftime` function deprecation warning on FormHelper::_getDateTimeValue method

ref: ARCH-11

* Switch deprecated utf8_encode function to mb_convert_encoding function

ref: ARCH-13

* Hide strftime deprecation warning

Since CakePHP 2 doesn't require the installation of `intl` PHP extension in it's documentation, I can't use the alternative `IntlDateFormatter::format` because it relies such extension.

ref: ARCH-13

* Roll back the use of strftime

ref: ARCH-11

* Fix preg_split subject param null deprecated on FormHelper::dateTime

* Fix preg_split deprecated null param limit on CakeResponse::checkNotModified

* fix: get rid of (some) PHP deprecation warnings

- CakeResponse.php strotime() and preg_split() warnings

* Ignore hide srtftime function deprecation warning from PHPCS

* Fix typo on phpcs ignore comments

---------

Co-authored-by: Jan Pešek <jan@sinch.cz>

.gitignore

@@ -10,6 +10,7 @@
 /dist
 /tags
 *.mo
+.phpunit.result.cache
 
 # IDE and editor specific files #
 #################################

Makefile

@@ -0,0 +1,10 @@
+.PHONY: bash up down
+
+up:
+	docker-compose up -d
+
+down:
+	docker-compose down -v
+
+bash:
+	docker-compose exec web bash

lib/Cake/Test/Case/Utility/CakeTimeTest.php

@@ -279,7 +279,9 @@ class CakeTimeTest extends CakeTestCase {
 		$this->assertEquals('on 2007-09-25', $result);
 
 		$result = $this->Time->timeAgoInWords('2007-9-25', '%x');
-		$this->assertEquals('on ' . strftime('%x', strtotime('2007-9-25')), $result);
+		// @codingStandardsIgnoreStart
+		$this->assertEquals('on ' . @strftime('%x', strtotime('2007-9-25')), $result);
+		// @codingStandardsIgnoreEnd
 
 		$result = $this->Time->timeAgoInWords(
 			strtotime('+2 weeks +2 days'),
@@ -303,7 +305,9 @@ class CakeTimeTest extends CakeTestCase {
 			strtotime('+2 months +2 days'),
 			array('end' => '1 month', 'format' => '%x')
 		);
-		$this->assertEquals('on ' . strftime('%x', strtotime('+2 months +2 days')), $result);
+		// @codingStandardsIgnoreStart
+		$this->assertEquals('on ' . @strftime('%x', strtotime('+2 months +2 days')), $result);
+		// @codingStandardsIgnoreEnd
 	}
 
 /**
@@ -1174,7 +1178,9 @@ class CakeTimeTest extends CakeTestCase {
 		$this->assertEquals($expected, $result);
 
 		$result = $this->Time->i18nFormat($time, '%c');
-		$expected = 'jue 14 ene 2010 13:59:28 ' . utf8_encode(strftime('%Z', $time));
+		// @codingStandardsIgnoreStart
+		$expected = 'jue 14 ene 2010 13:59:28 ' . mb_convert_encoding(@strftime('%Z', $time), 'UTF-8', 'ISO-8859-1');
+		// @codingStandardsIgnoreEnd
 		$this->assertEquals($expected, $result);
 
 		$result = $this->Time->i18nFormat($time, 'Time is %r, and date is %x');
@@ -1188,7 +1194,9 @@ class CakeTimeTest extends CakeTestCase {
 		$this->assertEquals($expected, $result);
 
 		$result = $this->Time->i18nFormat($time, '%c');
-		$expected = 'mié 13 ene 2010 13:59:28 ' . utf8_encode(strftime('%Z', $time));
+		// @codingStandardsIgnoreStart
+		$expected = 'mié 13 ene 2010 13:59:28 ' . mb_convert_encoding(@strftime('%Z', $time), 'UTF-8', 'ISO-8859-1');
+		// @codingStandardsIgnoreEnd
 		$this->assertEquals($expected, $result);
 
 		$result = $this->Time->i18nFormat($time, 'Time is %r, and date is %x');

lib/Cake/Utility/CakeTime.php

@@ -1167,7 +1167,9 @@ class CakeTime {
  * @return string formatted string with correct encoding.
  */
 	protected static function _strftime($format, $timestamp) {
-		$format = strftime($format, $timestamp);
+		// @codingStandardsIgnoreStart
+		$format = @strftime($format, $timestamp);
+		// @codingStandardsIgnoreEnd
 		$encoding = Configure::read('App.encoding');
 		if (!empty($encoding) && $encoding === 'UTF-8') {
 			if (function_exists('mb_check_encoding')) {
@@ -1176,7 +1178,7 @@ class CakeTime {
 				$valid = Multibyte::checkMultibyte($format);
 			}
 			if (!$valid) {
-				$format = utf8_encode($format);
+				$format = mb_convert_encoding($format, 'UTF-8', 'ISO-8859-1');
 			}
 		}
 		return $format;

lib/Cake/View/Helper.php

@@ -632,7 +632,7 @@ class Helper extends CakeObject {
  * @return array An array containing the identity elements of an entity
  */
 	public function entity() {
-		return explode('.', $this->_entityPath);
+		return explode('.', (string)$this->_entityPath);
 	}
 
 /**

lib/Cake/View/Helper/FormHelper.php

@@ -2708,7 +2708,7 @@ class FormHelper extends AppHelper {
 		}
 
 		$selects = array();
-		foreach (preg_split('//', $dateFormat, -1, PREG_SPLIT_NO_EMPTY) as $char) {
+		foreach (preg_split('//', (string)$dateFormat, -1, PREG_SPLIT_NO_EMPTY) as $char) {
 			switch ($char) {
 				case 'Y':
 					$attrs['Year']['value'] = $year;
@@ -2767,7 +2767,9 @@ class FormHelper extends AppHelper {
 		}
 
 		if (is_numeric($value)) {
-			$value = strftime('%Y-%m-%d %H:%M:%S', $value);
+			// @codingStandardsIgnoreStart
+			$value = @strftime('%Y-%m-%d %H:%M:%S', $value);
+			// @codingStandardsIgnoreEnd
 		}
 		$meridian = 'am';
 		$pos = strpos($value, '-');
@@ -3021,7 +3023,9 @@ class FormHelper extends AppHelper {
 					$data = $options['monthNames'];
 				} else {
 					for ($m = 1; $m <= 12; $m++) {
-						$data[sprintf("%02s", $m)] = strftime("%m", mktime(1, 1, 1, $m, 1, 1999));
+						// @codingStandardsIgnoreStart
+						$data[sprintf("%02s", $m)] = @strftime("%m", mktime(1, 1, 1, $m, 1, 1999));
+						// @codingStandardsIgnoreEnd
 					}
 				}
 				break;