Add is_array_assoc() and array indexed and associative tests

Curl.class.php

@@ -168,6 +168,10 @@ class Curl {
     public $response = NULL;
 }
 
+function is_array_assoc($array) {
+    return (bool)count(array_filter(array_keys($array), 'is_string'));
+}
+
 function is_array_multidim($array) {
     if (!is_array($array)) {
         return FALSE;

tests/run.php

@@ -10,6 +10,22 @@ class CurlTest extends PHPUnit_Framework_TestCase {
         $this->assertTrue(extension_loaded('curl'));
     }
 
+    public function testArrayAssociative() {
+        $this->assertTrue(is_array_assoc(array(
+            'foo' => 'wibble',
+            'bar' => 'wubble',
+            'baz' => 'wobble',
+        )));
+    }
+
+    public function testArrayIndexed() {
+        $this->assertFalse(is_array_assoc(array(
+            'wibble',
+            'wubble',
+            'wobble',
+        )));
+    }
+
     public function testUserAgent() {
         $test = new Test();
         $test->curl->setUserAgent(Curl::USER_AGENT);