Workaround for standard functions like is_int

sanmai · Mar 14, 2018 · 7b99a2f · 7b99a2f
1 parent 7dedb25
commit 7b99a2f
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diff --git a/src/Pipeline/Principal.php b/src/Pipeline/Principal.php
@@ -80,6 +80,13 @@ public function map(callable $func)
 
     public function filter(callable $func)
     {
+        // Strings usually are internal functions, which require exact number of parameters.
+        if (is_string($func)) {
+            $func = function ($value) use ($func) {
+                return $func($value);
+            };
+        }
+
         $this->pipeline = new \CallbackFilterIterator($this->pipeline, $func);
 
         return $this;

diff --git a/tests/Pipeline/EdgeCasesTest.php b/tests/Pipeline/EdgeCasesTest.php
@@ -31,6 +31,14 @@ public function testInitialCallbackNotGenerator()
         $this->assertEquals([PHP_INT_MAX], iterator_to_array($pipeline));
     }
 
+    public function testStandardStringFunctions()
+    {
+        $pipeline = new Simple(new \ArrayIterator([1, 2, 'foo', 'bar']));
+        $pipeline->filter('is_int');
+
+        $this->assertEquals([1, 2], iterator_to_array($pipeline));
+    }
+
     public function testInitialInvokeReturnsScalar()
     {
         $pipeline = new Simple();