Fix validation regarding multiple() and valid 0 value.

Author: Mark Scherer

src/Validation/Validation.php

@@ -654,7 +654,9 @@ public static function multiple($check, array $options = [], $caseInsensitive =
         $defaults = ['in' => null, 'max' => null, 'min' => null];
         $options += $defaults;
 
-        $check = array_filter((array)$check);
+        $check = array_filter((array)$check, function ($value) {
+            return ($value || is_numeric($value));
+        });
         if (empty($check)) {
             return false;
         }

tests/TestCase/Validation/ValidationTest.php

@@ -2141,17 +2141,18 @@ public function testMultiple()
         $this->assertFalse(Validation::multiple(''));
         $this->assertFalse(Validation::multiple(null));
         $this->assertFalse(Validation::multiple([]));
-        $this->assertFalse(Validation::multiple([0]));
-        $this->assertFalse(Validation::multiple(['0']));
+        $this->assertTrue(Validation::multiple([0]));
+        $this->assertTrue(Validation::multiple(['0']));
 
         $this->assertTrue(Validation::multiple([0, 3, 4, 5], ['in' => range(0, 10)]));
         $this->assertFalse(Validation::multiple([0, 15, 20, 5], ['in' => range(0, 10)]));
         $this->assertFalse(Validation::multiple([0, 5, 10, 11], ['in' => range(0, 10)]));
         $this->assertFalse(Validation::multiple(['boo', 'foo', 'bar'], ['in' => ['foo', 'bar', 'baz']]));
         $this->assertFalse(Validation::multiple(['foo', '1bar'], ['in' => range(0, 10)]));
 
-        $this->assertTrue(Validation::multiple([0, 5, 10, 11], ['max' => 3]));
-        $this->assertFalse(Validation::multiple([0, 5, 10, 11, 55], ['max' => 3]));
+        $this->assertFalse(Validation::multiple([1, 5, 10, 11], ['max' => 3]));
+        $this->assertTrue(Validation::multiple([0, 5, 10, 11], ['max' => 4]));
+        $this->assertFalse(Validation::multiple([0, 5, 10, 11, 55], ['max' => 4]));
         $this->assertTrue(Validation::multiple(['foo', 'bar', 'baz'], ['max' => 3]));
         $this->assertFalse(Validation::multiple(['foo', 'bar', 'baz', 'squirrel'], ['max' => 3]));
 
@@ -2166,7 +2167,8 @@ public function testMultiple()
         $this->assertFalse(Validation::multiple([0, 5, 9, 8, 6, 2, 1], ['in' => range(0, 10), 'max' => 5]));
         $this->assertFalse(Validation::multiple([0, 5, 9, 8, 11], ['in' => range(0, 10), 'max' => 5]));
 
-        $this->assertFalse(Validation::multiple([0, 5, 9], ['in' => range(0, 10), 'max' => 5, 'min' => 3]));
+        $this->assertTrue(Validation::multiple([0, 5, 9], ['in' => range(0, 10), 'max' => 5, 'min' => 3]));
+        $this->assertFalse(Validation::multiple(['', '5', '9'], ['max' => 5, 'min' => 3]));
         $this->assertFalse(Validation::multiple([0, 5, 9, 8, 6, 2, 1], ['in' => range(0, 10), 'max' => 5, 'min' => 2]));
         $this->assertFalse(Validation::multiple([0, 5, 9, 8, 11], ['in' => range(0, 10), 'max' => 5, 'min' => 2]));