Using language construct instead of function call

.travis.yml

@@ -3,6 +3,7 @@ language: php
 php:
   - 5.5
   - 5.6
+  - 7.0
 
 branches:
   only:

CHANGELOG.md

@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## Changes in Version 1.3.1
+
+* Fixed issue #1
+
 ## Changes in Version 1.3.0
 
 * Introduced `ifPassed( $continue )` method for a conditional continue of x further checks, only if all previous checks passed so far.

build/tools/update_tools.sh

@@ -3,7 +3,7 @@
 # Absolute path to this script, e.g. /home/user/bin/foo.sh
 cd "$(dirname "$0")"
 
-for pharFile in `ls -1 *.phar`; do rm -rf "$pharFile"; done
+rm -rf ./*.phar
 
 # Composer
 rm -f composer.phar

src/FluidValidator.php

@@ -291,7 +291,7 @@ private function checkNullCondition( $methodName, $var )
 		$value    = $this->getValue( $var );
 		$optional = (substr( $methodName, -6 ) == 'OrNull');
 
-		return ($optional && is_null( $value ));
+		return ($optional && ($value === null));
 	}
 
 	/**
@@ -561,7 +561,7 @@ protected function checkIsNotSame( $value1, $value2 )
 	 */
 	protected function checkIsNull( $value )
 	{
-		return is_null( $this->getValue( $value ) );
+		return ($this->getValue( $value ) === null);
 	}
 
 	/**
@@ -571,7 +571,7 @@ protected function checkIsNull( $value )
 	 */
 	protected function checkIsNotNull( $value )
 	{
-		return !is_null( $this->getValue( $value ) );
+		return ($this->getValue( $value ) !== null);
 	}
 
 	/**

src/Validators/StringValidator.php

@@ -190,7 +190,7 @@ public function isJson( $value )
 		{
 			$val = strval( $value );
 
-			if ( !is_null( json_decode( $val ) ) && json_last_error() === JSON_ERROR_NONE )
+			if ( (json_decode( $val ) !== null) && json_last_error() === JSON_ERROR_NONE )
 			{
 				return true;
 			}