bug #3075 [1.x] Patch split filter (adriansuter)

This PR was squashed before being merged into the 1.x branch (closes #3075).

Discussion
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[1.x] Patch split filter

This PR addresses #3072 vor Twig 1.x.

Commits
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4c4df962 [1.x] Patch split filter

src/Extension/CoreExtension.php

@@ -790,7 +790,7 @@ function twig_join_filter($value, $glue = '', $and = null)
  */
 function twig_split_filter(Environment $env, $value, $delimiter, $limit = null)
 {
-    if (!empty($delimiter)) {
+    if (strlen($delimiter)) {
         return null === $limit ? explode($delimiter, $value) : explode($delimiter, $value, $limit);
     }
 

test/Twig/Tests/Fixtures/filters/split.test

@@ -8,6 +8,7 @@
 {{ baz|split('', 1)|join('-') }}
 {{ baz|split('', 2)|join('-') }}
 {{ foo|split(',', -2)|join('-') }}
+{{ "hello0world"|split('0')|join('-') }}
 --DATA--
 return ['foo' => "one,two,three,four,five", 'baz' => '12345',]
 --EXPECT--
@@ -17,4 +18,5 @@ one-two-three,four,five
 1-2-3-4-5
 1-2-3-4-5
 12-34-5
-one-two-three
+one-two-three
+hello-world