Added Stdlib class for testing if a value is an assoc array

src/IsAssocArray.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Zend\Stdlib;
+
+/**
+ * Simple class for testing whether a value is an associative array
+ *
+ * Declared abstract, as we have no need for instantiation.
+ */
+abstract class IsAssocArray
+{
+    /**
+     * Test whether a value is an associative array
+     *
+     * We have an associative array if at least one key is a string.
+     * 
+     * @param  mixed $value 
+     * @return bool
+     */
+    public static function test($value)
+    {
+        return (is_array($value)
+                && count(array_filter(array_keys($value), 'is_string')) > 0
+        );
+    }
+}

test/IsAssocArrayTest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace ZendTest\Stdlib;
+
+use PHPUnit_Framework_TestCase as TestCase,
+    stdClass,
+    Zend\Stdlib\IsAssocArray;
+
+class IsAssocArrayTest extends TestCase
+{
+    public static function validAssocArrays()
+    {
+        return array(
+            array(array(
+                'foo' => 'bar',
+            )),
+            array(array(
+                'bar',
+                'foo' => 'bar',
+                'baz',
+            )),
+        );
+    }
+
+    public static function invalidAssocArrays()
+    {
+        return array(
+            array(null),
+            array(true),
+            array(false),
+            array(0),
+            array(1),
+            array(0.0),
+            array(1.0),
+            array('string'),
+            array(array(0, 1, 2)),
+            array(new stdClass),
+        );
+    }
+
+    /**
+     * @dataProvider validAssocArrays
+     */
+    public function testValidAssocArraysReturnTrue($test)
+    {
+        $this->assertTrue(IsAssocArray::test($test));
+    }
+
+    /**
+     * @dataProvider invalidAssocArrays
+     */
+    public function testInvalidAssocArraysReturnFalse($test)
+    {
+        $this->assertFalse(IsAssocArray::test($test));
+    }
+}