Fix symfony#12315

Alexander Miehe · Alexander Miehe · commit 53016a52594e · 2017-06-28T15:30:26.000+02:00
* change string check
diff --git a/src/Symfony/Component/Validator/Constraints/ExpressionValidator.php b/src/Symfony/Component/Validator/Constraints/ExpressionValidator.php
@@ -47,7 +47,7 @@ public function validate($value, Constraint $constraint)
         $variables['value'] = $value;
         $variables['this'] = $this->context->getObject();
 
-        if (strlen($constraint->dataPath) > 0) {
+        if (null !== $constraint->dataPath && '' !== $constraint->dataPath) {
             $variables['this'] = $this->getPropertyAccessor()->getValue($this->context, $constraint->dataPath);
         }
 

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,7 @@ public function validate($value, Constraint $constraint)`
`47`	`47`	`$variables['value'] = $value;`
`48`	`48`	`$variables['this'] = $this->context->getObject();`
`49`	`49`
`50`		`- if (strlen($constraint->dataPath) > 0) {`
	`50`	`+ if (null !== $constraint->dataPath && '' !== $constraint->dataPath) {`
`51`	`51`	`$variables['this'] = $this->getPropertyAccessor()->getValue($this->context, $constraint->dataPath);`
`52`	`52`	`}`
`53`	`53`