Method validate() should always return a boolean

docs/README.md

@@ -242,7 +242,7 @@ use Respect\Validation\Rules\AbstractRule;
 
 class MyRule extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         // Do something here with the $input and return a boolean value
     }

library/Rules/AbstractFilterRule.php

@@ -35,7 +35,7 @@ abstract class AbstractFilterRule extends AbstractRule
         return str_replace(str_split($this->additionalChars), '', $input);
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_scalar($input)) {
             return false;

library/Rules/AbstractRelated.php

@@ -82,7 +82,7 @@ abstract class AbstractRelated extends AbstractRule
         return $this->decision('check', $hasReference, $input);
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $hasReference = $this->hasReference($input);
         if ($this->mandatory && !$hasReference) {

library/Rules/AbstractWrapper.php

@@ -56,7 +56,7 @@ abstract class AbstractWrapper extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         return $this->validatable->validate($input);
     }

library/Rules/AllOf.php

@@ -41,7 +41,7 @@ class AllOf extends AbstractComposite
         return true;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         foreach ($this->getRules() as $rule) {
             if (!$rule->validate($input)) {

library/Rules/AlwaysInvalid.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class AlwaysInvalid extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return false;
     }

library/Rules/AlwaysValid.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class AlwaysValid extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return true;
     }

library/Rules/AnyOf.php

@@ -30,7 +30,7 @@ class AnyOf extends AbstractComposite
         return true;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         foreach ($this->getRules() as $v) {
             if ($v->validate($input)) {

library/Rules/ArrayType.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class ArrayType extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_array($input);
     }

library/Rules/ArrayVal.php

@@ -18,7 +18,7 @@ use SimpleXMLElement;
 
 class ArrayVal extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_array($input) || $input instanceof ArrayAccess || $input instanceof SimpleXMLElement;
     }

library/Rules/Base.php

@@ -33,7 +33,7 @@ class Base extends AbstractRule
         $this->base = $base;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $valid = mb_substr($this->chars, 0, $this->base);
 

library/Rules/Base64.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Base64 extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_string($input)) {
             return false;

library/Rules/BoolType.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class BoolType extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_bool($input);
     }

library/Rules/BoolVal.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class BoolVal extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_bool(filter_var($input, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE));
     }

library/Rules/Bsn.php

@@ -25,7 +25,7 @@ class Bsn extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!ctype_digit($input)) {
             return false;

library/Rules/CallableType.php

@@ -21,7 +21,7 @@ class CallableType extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_callable($input);
     }

library/Rules/Callback.php

@@ -33,7 +33,7 @@ class Callback extends AbstractRule
         $this->arguments = $arguments;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $params = $this->arguments;
         array_unshift($params, $input);

library/Rules/Charset.php

@@ -35,7 +35,7 @@ class Charset extends AbstractRule
         $this->charset = $charset;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $detectedEncoding = mb_detect_encoding($input, $this->charset, true);
 

library/Rules/Cnh.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Cnh extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_scalar($input)) {
             return false;

library/Rules/Cnpj.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Cnpj extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_scalar($input)) {
             return false;

library/Rules/Contains.php

@@ -24,7 +24,7 @@ class Contains extends AbstractRule
         $this->identical = $identical;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($this->identical) {
             return $this->validateIdentical($input);

library/Rules/Countable.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Countable extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_array($input) || $input instanceof \Countable;
     }

library/Rules/CountryCode.php

@@ -317,7 +317,7 @@ class CountryCode extends AbstractRule
         return $countryList;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         return in_array(
             mb_strtoupper($input),

library/Rules/Cpf.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Cpf extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         // Code ported from jsfromhell.com
         $c = preg_replace('/\D/', '', $input);

library/Rules/CreditCard.php

@@ -58,7 +58,7 @@ class CreditCard extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         $input = preg_replace('([^0-9])', '', $input);
 

library/Rules/CurrencyCode.php

@@ -204,7 +204,7 @@ class CurrencyCode extends AbstractRule
         'ZWL', // Zimbabwe Dollar
     ];
 
-    public function validate($input)
+    public function validate($input): bool
     {
         return in_array(mb_strtoupper($input), $this->currencyCodes, true);
     }

library/Rules/DateTime.php

@@ -24,7 +24,7 @@ class DateTime extends AbstractRule
         $this->format = $format;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof DateTimeInterface) {
             return true;

library/Rules/Directory.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Directory extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof \SplFileInfo) {
             return $input->isDir();

library/Rules/Domain.php

@@ -57,7 +57,7 @@ class Domain extends AbstractComposite
         return true;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         foreach ($this->checks as $chk) {
             if (!$chk->validate($input)) {

library/Rules/Each.php

@@ -79,7 +79,7 @@ class Each extends IterableType
         return true;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!parent::validate($input)) {
             return false;

library/Rules/Email.php

@@ -33,7 +33,7 @@ class Email extends AbstractRule
         return $this->emailValidator;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $emailValidator = $this->getEmailValidator();
         if (!$emailValidator instanceof EmailValidator) {

library/Rules/EndsWith.php

@@ -24,7 +24,7 @@ class EndsWith extends AbstractRule
         $this->identical = $identical;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($this->identical) {
             return $this->validateIdentical($input);

library/Rules/Even.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Even extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return 0 === (int) $input % 2;
     }

library/Rules/Executable.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Executable extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof \SplFileInfo) {
             return $input->isExecutable();

library/Rules/Exists.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Exists extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof \SplFileInfo) {
             $input = $input->getPathname();

library/Rules/Extension.php

@@ -38,7 +38,7 @@ class Extension extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof SplFileInfo) {
             return $input->getExtension() == $this->extension;

library/Rules/Factor.php

@@ -33,7 +33,7 @@ class Factor extends AbstractRule
         $this->dividend = (int) $dividend;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         // Every integer is a factor of zero, and zero is the only integer that
         // has zero for a factor.

library/Rules/FalseVal.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class FalseVal extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (false === $input) { // PHP 5.3 workaround
             return true;

library/Rules/Fibonacci.php

@@ -21,7 +21,7 @@ class Fibonacci extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_numeric($input)) {
             return false;

library/Rules/File.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class File extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof \SplFileInfo) {
             return $input->isFile();

library/Rules/Finite.php

@@ -21,7 +21,7 @@ class Finite extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_numeric($input) && is_finite((float) $input);
     }

library/Rules/FloatType.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class FloatType extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_float($input);
     }

library/Rules/FloatVal.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class FloatVal extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_float(filter_var($input, FILTER_VALIDATE_FLOAT));
     }

library/Rules/HexRgbColor.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class HexRgbColor extends Xdigit
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_string($input)) {
             return false;

library/Rules/Image.php

@@ -25,7 +25,7 @@ class Image extends AbstractRule
         $this->fileInfo = $fileInfo ?: new finfo(FILEINFO_MIME_TYPE);
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof SplFileInfo) {
             $input = $input->getPathname();

library/Rules/Imei.php

@@ -24,7 +24,7 @@ class Imei extends AbstractRule
      *
      * @return bool
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_scalar($input)) {
             return false;

library/Rules/In.php

@@ -54,7 +54,7 @@ class In extends AbstractRule
         return false !== mb_strpos($this->haystack, $inputString, 0, mb_detect_encoding($inputString));
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($this->compareIdentical) {
             return $this->validateIdentical($input);

library/Rules/Infinite.php

@@ -21,7 +21,7 @@ class Infinite extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_numeric($input) && is_infinite((float) $input);
     }

library/Rules/Instance.php

@@ -27,7 +27,7 @@ class Instance extends AbstractRule
         return parent::reportError($input, $extraParams);
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         return $input instanceof $this->instanceName;
     }

library/Rules/IntType.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class IntType extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_int($input);
     }

library/Rules/IntVal.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class IntVal extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_numeric($input) && (int) $input == $input;
     }

library/Rules/Ip.php

@@ -98,7 +98,7 @@ class Ip extends AbstractRule
         $range['mask'] = sprintf('%032b', ip2long(long2ip(~(2 ** (32 - $input[1]) - 1))));
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         return $this->verifyAddress($input) && $this->verifyNetwork($input);
     }

library/Rules/IterableType.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class IterableType extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_array($input) ||
             $input instanceof \stdClass ||

library/Rules/Json.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Json extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_string($input) || '' === $input) {
             return false;

library/Rules/KeySet.php

@@ -140,7 +140,7 @@ class KeySet extends AllOf
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!$this->hasValidStructure($input)) {
             return false;

library/Rules/KeyValue.php

@@ -92,7 +92,7 @@ class KeyValue extends AbstractRule
         return true;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         try {
             $rule = $this->getRule($input);

library/Rules/LanguageCode.php

@@ -551,7 +551,7 @@ class LanguageCode extends AbstractRule
         return $languageList;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_string($input) || '' === $input) {
             return false;

library/Rules/LeapDate.php

@@ -25,7 +25,7 @@ class LeapDate extends AbstractRule
         $this->format = $format;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if (is_string($input)) {
             $date = DateTimeImmutable::createFromFormat($this->format, $input);

library/Rules/LeapYear.php

@@ -17,7 +17,7 @@ use DateTimeInterface;
 
 class LeapYear extends AbstractRule
 {
-    public function validate($year)
+    public function validate($year): bool
     {
         if (is_numeric($year)) {
             $year = (int) $year;

library/Rules/Length.php

@@ -46,7 +46,7 @@ class Length extends AbstractRule
         }
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $length = $this->extractLength($input);
 

library/Rules/Locale/PlIdentityCard.php

@@ -22,7 +22,7 @@ use Respect\Validation\Rules\AbstractRule;
  */
 class PlIdentityCard extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!preg_match('/^[A-Z0-9]{9}$/', $input)) {
             return false;

library/Rules/Locale/PlVatin.php

@@ -22,7 +22,7 @@ use Respect\Validation\Rules\AbstractRule;
  */
 final class PlVatin extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_scalar($input)) {
             return false;

library/Rules/Lowercase.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Lowercase extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return $input === mb_strtolower($input, mb_detect_encoding($input));
     }

library/Rules/Luhn.php

@@ -21,7 +21,7 @@ class Luhn extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!(new Digit())->validate($input)) {
             return false;

library/Rules/MacAddress.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class MacAddress extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return !empty($input) && preg_match('/^(([0-9a-fA-F]{2}-){5}|([0-9a-fA-F]{2}:){5})[0-9a-fA-F]{2}$/', $input);
     }

library/Rules/Max.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Max extends AbstractInterval
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($this->inclusive) {
             return $this->filterInterval($input) <= $this->filterInterval($this->interval);

library/Rules/Mimetype.php

@@ -46,7 +46,7 @@ class Mimetype extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof SplFileInfo) {
             $input = $input->getPathname();

library/Rules/Min.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Min extends AbstractInterval
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($this->inclusive) {
             return $this->filterInterval($input) >= $this->filterInterval($this->interval);

library/Rules/MinimumAge.php

@@ -32,7 +32,7 @@ class MinimumAge extends AbstractRule
         $this->format = $format;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof DateTimeInterface) {
             $birthday = new DateTimeImmutable('now - '.$this->age.' year');

library/Rules/Multiple.php

@@ -22,7 +22,7 @@ class Multiple extends AbstractRule
         $this->multipleOf = $multipleOf;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if (0 == $this->multipleOf) {
             return 0 == $input;

library/Rules/Negative.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Negative extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return $input < 0;
     }

library/Rules/NfeAccessKey.php

@@ -28,7 +28,7 @@ class NfeAccessKey extends AbstractRule
      *
      * @return bool
      */
-    public function validate($aK)
+    public function validate($aK): bool
     {
         if (44 !== mb_strlen($aK)) {
             return false;

library/Rules/Nif.php

@@ -25,7 +25,7 @@ final class Nif extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_string($input)) {
             return false;

library/Rules/NoWhitespace.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class NoWhitespace extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (is_null($input)) {
             return true;

library/Rules/NoneOf.php

@@ -27,7 +27,7 @@ class NoneOf extends AbstractComposite
         return true;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         foreach ($this->getRules() as $rule) {
             if ($rule->validate($input)) {

library/Rules/Not.php

@@ -32,9 +32,9 @@ class Not extends AbstractRule
         return parent::setName($name);
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
-        return false == $this->rule->validate($input);
+        return false === $this->rule->validate($input);
     }
 
     public function assert($input)

library/Rules/NotBlank.php

@@ -17,7 +17,7 @@ use stdClass;
 
 class NotBlank extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (is_numeric($input)) {
             return 0 != $input;

library/Rules/NotEmpty.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class NotEmpty extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (is_string($input)) {
             $input = trim($input);

library/Rules/NotOptional.php

@@ -19,7 +19,7 @@ class NotOptional extends AbstractRule
 {
     use UndefinedHelper;
 
-    public function validate($input)
+    public function validate($input): bool
     {
         return false === $this->isUndefined($input);
     }

library/Rules/NullType.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class NullType extends NotEmpty
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_null($input);
     }

library/Rules/Number.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Number extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_numeric($input)) {
             return false;

library/Rules/NumericVal.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class NumericVal extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_numeric($input);
     }

library/Rules/ObjectType.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class ObjectType extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_object($input);
     }

library/Rules/Odd.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Odd extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return 0 !== (int) $input % 2;
     }

library/Rules/OneOf.php

@@ -34,7 +34,7 @@ class OneOf extends AbstractComposite
         return true;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $rulesPassedCount = 0;
         foreach ($this->getRules() as $rule) {

library/Rules/Optional.php

@@ -38,7 +38,7 @@ class Optional extends AbstractWrapper
         return parent::check($input);
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($this->isUndefined($input)) {
             return true;

library/Rules/PerfectSquare.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class PerfectSquare extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_numeric($input) && floor(sqrt((float) $input)) == sqrt((float) $input);
     }

library/Rules/Pesel.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Pesel extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!preg_match('/^\d{11}$/', (string) $input)) {
             return false;

library/Rules/PhpLabel.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class PhpLabel extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_string($input) && preg_match('/^[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*$/', $input);
     }

library/Rules/Pis.php

@@ -24,7 +24,7 @@ class Pis extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_scalar($input)) {
             return false;

library/Rules/Positive.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Positive extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         return $input > 0;
     }

library/Rules/PrimeNumber.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class PrimeNumber extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_numeric($input) || $input <= 1) {
             return false;

library/Rules/Readable.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Readable extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof \SplFileInfo) {
             return $input->isReadable();

library/Rules/Regex.php

@@ -22,7 +22,7 @@ class Regex extends AbstractRule
         $this->regex = $regex;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         if (!is_scalar($input)) {
             return false;

library/Rules/ResourceType.php

@@ -21,7 +21,7 @@ class ResourceType extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_resource($input);
     }

library/Rules/ScalarVal.php

@@ -21,7 +21,7 @@ class ScalarVal extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         return is_scalar($input);
     }

library/Rules/Sf.php

@@ -65,7 +65,7 @@ class Sf extends AbstractRule
         throw $this->reportError((string) $violations);
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $violations = $this->returnViolationsForConstraint($input, $this->constraint);
         if (count($violations)) {

library/Rules/Size.php

@@ -102,7 +102,7 @@ class Size extends AbstractRule
     /**
      * {@inheritdoc}
      */
-    public function validate($input)
+    public function validate($input): bool
     {
         if ($input instanceof SplFileInfo) {
             return $this->isValidSize($input->getSize());

library/Rules/Slug.php

@@ -15,7 +15,7 @@ namespace Respect\Validation\Rules;
 
 class Slug extends AbstractRule
 {
-    public function validate($input)
+    public function validate($input): bool
     {
         if (mb_strstr($input, '--')) {
             return false;

library/Rules/Sorted.php

@@ -24,7 +24,7 @@ class Sorted extends AbstractRule
         $this->ascending = $ascending;
     }
 
-    public function validate($input)
+    public function validate($input): bool
     {
         $count = count($input);
         if ($count < 2) {